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/**
Typings for primary entry point, Node.js specific typings can be found in index.d.ts
*/
import type {ReadableStream as WebReadableStream} from 'node:stream/web';
import type {ITokenizer, AnyWebByteStream} from 'strtok3';
/**
Either the Node.js ReadableStream or the `lib.dom.d.ts` ReadableStream.
Related issue: https://github.com/DefinitelyTyped/DefinitelyTyped/pull/60377
*/
export type AnyWebReadableStream<G> = WebReadableStream<G> | ReadableStream<G>;
export type FileTypeResult = {
/**
One of the supported [file types](https://github.com/sindresorhus/file-type#supported-file-types).
*/
readonly ext: string;
/**
The detected [MIME type](https://en.wikipedia.org/wiki/Internet_media_type).
*/
readonly mime: string;
};
/**
Detect the file type of a `Uint8Array` or `ArrayBuffer`.
The file type is detected by checking the [magic number](https://en.wikipedia.org/wiki/Magic_number_(programming)#Magic_numbers_in_files) of the buffer.
If file access is available, it is recommended to use `.fromFile()` instead.
@param buffer - An Uint8Array or ArrayBuffer representing file data. It works best if the buffer contains the entire file. It may work with a smaller portion as well.
@param options - Options to override default behavior.
@returns The detected file type, or `undefined` when there is no match.
*/
export function fileTypeFromBuffer(buffer: Uint8Array | ArrayBuffer, options?: FileTypeOptions): Promise<FileTypeResult | undefined>;
/**
Detect the file type of a [web `ReadableStream`](https://developer.mozilla.org/en-US/docs/Web/API/ReadableStream).
The file type is detected by checking the [magic number](https://en.wikipedia.org/wiki/Magic_number_(programming)#Magic_numbers_in_files) of the buffer.
@param stream - A [web `ReadableStream`](https://developer.mozilla.org/en-US/docs/Web/API/ReadableStream) streaming a file to examine.
@param options - Options to override default behavior.
@returns A `Promise` for an object with the detected file type, or `undefined` when there is no match.
*/
export function fileTypeFromStream(stream: AnyWebByteStream, options?: FileTypeOptions): Promise<FileTypeResult | undefined>;
/**
Detect the file type from an [`ITokenizer`](https://github.com/Borewit/strtok3#tokenizer) source.
This method is used internally, but can also be used for a special "tokenizer" reader.
A tokenizer propagates the internal read functions, allowing alternative transport mechanisms, to access files, to be implemented and used.
@param tokenizer - File source implementing the tokenizer interface.
@param options - Options to override default behavior.
@returns The detected file type, or `undefined` when there is no match.
An example is [`@tokenizer/http`](https://github.com/Borewit/tokenizer-http), which requests data using [HTTP-range-requests](https://developer.mozilla.org/en-US/docs/Web/HTTP/Range_requests). A difference with a conventional stream and the [*tokenizer*](https://github.com/Borewit/strtok3#tokenizer), is that it is able to *ignore* (seek, fast-forward) in the stream. For example, you may only need and read the first 6 bytes, and the last 128 bytes, which may be an advantage in case reading the entire file would take longer.
@example
```
import {makeTokenizer} from '@tokenizer/http';
import {fileTypeFromTokenizer} from 'file-type';
const audioTrackUrl = 'https://test-audio.netlify.com/Various%20Artists%20-%202009%20-%20netBloc%20Vol%2024_%20tiuqottigeloot%20%5BMP3-V2%5D/01%20-%20Diablo%20Swing%20Orchestra%20-%20Heroines.mp3';
const httpTokenizer = await makeTokenizer(audioTrackUrl);
const fileType = await fileTypeFromTokenizer(httpTokenizer);
console.log(fileType);
//=> {ext: 'mp3', mime: 'audio/mpeg'}
```
*/
export function fileTypeFromTokenizer(tokenizer: ITokenizer, options?: FileTypeOptions): Promise<FileTypeResult | undefined>;
/**
Supported file extensions.
*/
export const supportedExtensions: ReadonlySet<string>;
/**
Supported MIME types.
*/
export const supportedMimeTypes: ReadonlySet<string>;
export type StreamOptions = {
/**
The default sample size in bytes.
@default 4100
*/
readonly sampleSize?: number;
};
/**
Detect the file type of a [`Blob`](https://nodejs.org/api/buffer.html#class-blob) or [`File`](https://developer.mozilla.org/en-US/docs/Web/API/File).
@param blob - The [`Blob`](https://nodejs.org/api/buffer.html#class-blob) used for file detection.
@param options - Options to override default behavior.
@returns The detected file type, or `undefined` when there is no match.
@example
```
import {fileTypeFromBlob} from 'file-type';
const blob = new Blob(['<?xml version="1.0" encoding="ISO-8859-1" ?>'], {
type: 'text/plain',
endings: 'native'
});
console.log(await fileTypeFromBlob(blob));
//=> {ext: 'txt', mime: 'text/plain'}
```
*/
export declare function fileTypeFromBlob(blob: Blob, options?: FileTypeOptions): Promise<FileTypeResult | undefined>;
/**
A custom file type detector.
Custom file type detectors are plugins designed to extend the default detection capabilities.
They allow support for uncommon file types, non-binary formats, or customized detection behavior.
Detectors can be added via the constructor options or by modifying `FileTypeParser#detectors` directly.
Detectors provided through the constructor are executed before the default ones.
Detectors can be added via the constructor options or by directly modifying `FileTypeParser#detectors`.
### Example adding a detector
```js
import {FileTypeParser} from 'file-type';
import {detectXml} from '@file-type/xml';
const parser = new FileTypeParser({customDetectors: [detectXml]});
const fileType = await parser.fromFile('sample.kml');
console.log(fileType);
```
### Available-third party file-type detectors
- [@file-type/xml](https://github.com/Borewit/file-type-xml): Detects common XML file types, such as GLM, KML, MusicXML, RSS, SVG, and XHTML
### Detector execution flow
If a detector returns `undefined`, the following rules apply:
1. **No Tokenizer Interaction**: If the detector does not modify the tokenizer's position, the next detector in the sequence is executed.
2. **Tokenizer Interaction**: If the detector modifies the tokenizer's position (`tokenizer.position` is advanced), no further detectors are executed. In this case, the file type remains `undefined`, as subsequent detectors cannot evaluate the content. This is an exceptional scenario, as it prevents any other detectors from determining the file type.
### Example writing a custom detector
Below is an example of a custom detector array. This can be passed to the `FileTypeParser` via the `fileTypeOptions` argument.
```
import {FileTypeParser} from 'file-type';
const customDetectors = [
async tokenizer => {
const unicornHeader = [85, 78, 73, 67, 79, 82, 78]; // "UNICORN" in ASCII decimal
const buffer = new Uint8Array(unicornHeader.length);
await tokenizer.peekBuffer(buffer, {length: unicornHeader.length, mayBeLess: true});
if (unicornHeader.every((value, index) => value === buffer[index])) {
return {ext: 'unicorn', mime: 'application/unicorn'};
}
return undefined;
},
];
const buffer = new Uint8Array([85, 78, 73, 67, 79, 82, 78]);
const parser = new FileTypeParser({customDetectors});
const fileType = await parser.fromBuffer(buffer);
console.log(fileType); // {ext: 'unicorn', mime: 'application/unicorn'}
```
@param tokenizer - The [tokenizer](https://github.com/Borewit/strtok3#tokenizer) used to read file content.
@param fileType - The file type detected by standard or previous custom detectors, or `undefined` if no match is found.
@returns The detected file type, or `undefined` if no match is found.
*/
export type Detector = {
id: string;
detect: (tokenizer: ITokenizer, fileType?: FileTypeResult) => Promise<FileTypeResult | undefined>;
};
export type FileTypeOptions = {
customDetectors?: Iterable<Detector>;
/**
Specifies the byte tolerance for locating the first MPEG audio frame (e.g. `.mp1`, `.mp2`, `.mp3`, `.aac`).
Allows detection to handle slight sync offsets between the expected and actual frame start. Common in malformed or incorrectly muxed files, which, while technically invalid, do occur in the wild.
A tolerance of 10 bytes covers most cases.
@default 0
*/
mpegOffsetTolerance?: number;
};
export declare class TokenizerPositionError extends Error {
constructor(message?: string);
}
export type AnyWebReadableByteStreamWithFileType = AnyWebReadableStream<Uint8Array> & {
readonly fileType?: FileTypeResult;
};
/**
Workaround for using `bundler` as the module-resolution in TypeScript.
*/
export function fileTypeFromFile(filePath: string, options?: {customDetectors?: Iterable<Detector>}): Promise<FileTypeResult | undefined>;
/**
Returns a `Promise` which resolves to the original readable stream argument, but with an added `fileType` property, which is an object like the one returned from `fileTypeFromFile()`.
This method can be handy to put in a stream pipeline, but it comes with a price. Internally `stream()` builds up a buffer of `sampleSize` bytes, used as a sample, to determine the file type. The sample size impacts the file detection resolution. A smaller sample size will result in lower probability of the best file type detection.
*/
export function fileTypeStream(webStream: AnyWebReadableStream<Uint8Array>, options?: StreamOptions): Promise<AnyWebReadableByteStreamWithFileType>;
export declare class FileTypeParser {
/**
File type detectors.
Initialized with a single entry holding the built-in detector function.
*/
detectors: Detector[];
constructor(options?: {customDetectors?: Iterable<Detector>; signal?: AbortSignal});
/**
Works the same way as {@link fileTypeFromBuffer}, additionally taking into account custom detectors (if any were provided to the constructor).
*/
fromBuffer(buffer: Uint8Array | ArrayBuffer): Promise<FileTypeResult | undefined>;
/**
Works the same way as {@link fileTypeFromTokenizer}, additionally taking into account custom detectors (if any were provided to the constructor).
*/
fromTokenizer(tokenizer: ITokenizer): Promise<FileTypeResult | undefined>;
/**
Works the same way as {@link fileTypeFromBlob}, additionally taking into account custom detectors (if any were provided to the constructor).
*/
fromBlob(blob: Blob): Promise<FileTypeResult | undefined>;
/**
Works the same way as {@link fileTypeStream}, additionally taking into account custom detectors (if any were provided to the constructor).
*/
toDetectionStream(webStream: AnyWebReadableStream<Uint8Array>, options?: StreamOptions): Promise<AnyWebReadableByteStreamWithFileType>;
}

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/**
Typings for Node.js specific entry point.
*/
import type {Readable as NodeReadableStream} from 'node:stream';
import type {AnyWebByteStream} from 'strtok3';
import {
type FileTypeResult,
type StreamOptions,
type AnyWebReadableStream,
type AnyWebReadableByteStreamWithFileType,
type FileTypeOptions,
FileTypeParser as DefaultFileTypeParser,
} from './core.js';
export type ReadableStreamWithFileType = NodeReadableStream & {
readonly fileType?: FileTypeResult;
};
/**
Extending `FileTypeParser` with Node.js engine specific functions.
*/
export declare class FileTypeParser extends DefaultFileTypeParser {
/**
@param stream - Node.js `stream.Readable` or web `ReadableStream`.
*/
fromStream(stream: AnyWebReadableStream<Uint8Array> | NodeReadableStream): Promise<FileTypeResult | undefined>;
fromFile(filePath: string): Promise<FileTypeResult | undefined>;
/**
Works the same way as {@link fileTypeStream}, additionally taking into account custom detectors (if any were provided to the constructor).
*/
toDetectionStream(readableStream: NodeReadableStream, options?: FileTypeOptions & StreamOptions): Promise<ReadableStreamWithFileType>;
toDetectionStream(webStream: AnyWebReadableStream<Uint8Array>, options?: FileTypeOptions & StreamOptions): Promise<AnyWebReadableByteStreamWithFileType>;
}
/**
Detect the file type of a file path.
The file type is detected by checking the [magic number](https://en.wikipedia.org/wiki/Magic_number_(programming)#Magic_numbers_in_files) of the file.
This is for Node.js only.
To read from a [`File`](https://developer.mozilla.org/docs/Web/API/File), see `fileTypeFromBlob()`.
The file type is detected by checking the [magic number](https://en.wikipedia.org/wiki/Magic_number_(programming)#Magic_numbers_in_files) of the buffer.
@returns The detected file type and MIME type or `undefined` when there is no match.
*/
export function fileTypeFromFile(filePath: string, options?: FileTypeOptions): Promise<FileTypeResult | undefined>;
/**
Detect the file type of a [web `ReadableStream`](https://developer.mozilla.org/en-US/docs/Web/API/ReadableStream).
If the engine is Node.js, this may also be a [Node.js `stream.Readable`](https://nodejs.org/api/stream.html#stream_class_stream_readable).
Direct support for Node.js streams will be dropped in the future, when Node.js streams can be converted to Web streams (see [`toWeb()`](https://nodejs.org/api/stream.html#streamreadabletowebstreamreadable-options)).
The file type is detected by checking the [magic number](https://en.wikipedia.org/wiki/Magic_number_(programming)#Magic_numbers_in_files) of the buffer.
@param stream - A [web `ReadableStream`](https://developer.mozilla.org/en-US/docs/Web/API/ReadableStream) or [Node.js `stream.Readable`](https://nodejs.org/api/stream.html#stream_class_stream_readable) streaming a file to examine.
@param options - Options to override default behaviour.
@returns A `Promise` for an object with the detected file type, or `undefined` when there is no match.
*/
export function fileTypeFromStream(stream: AnyWebReadableStream<Uint8Array> | NodeReadableStream, options?: FileTypeOptions): Promise<FileTypeResult | undefined>;
/**
Returns a `Promise` which resolves to the original readable stream argument, but with an added `fileType` property, which is an object like the one returned from `fileTypeFromFile()`.
This method can be handy to put in between a stream, but it comes with a price.
Internally `stream()` builds up a buffer of `sampleSize` bytes, used as a sample, to determine the file type.
The sample size impacts the file detection resolution.
A smaller sample size will result in lower probability of the best file type detection.
@param readableStream - A [web `ReadableStream`](https://developer.mozilla.org/en-US/docs/Web/API/ReadableStream) or [Node.js `stream.Readable`](https://nodejs.org/api/stream.html#stream_class_stream_readable), streaming a file to examine.
@param options - May be used to override the default sample size.
@returns A `Promise` which resolves to the original readable stream argument, but with an added `fileType` property, which is an object like the one returned from `fileTypeFromFile()`.
@example
```
import got from 'got';
import {fileTypeStream} from 'file-type';
const url = 'https://upload.wikimedia.org/wikipedia/en/a/a9/Example.jpg';
const stream1 = got.stream(url);
const stream2 = await fileTypeStream(stream1, {sampleSize: 1024});
if (stream2.fileType?.mime === 'image/jpeg') {
// stream2 can be used to stream the JPEG image (from the very beginning of the stream)
}
```
*/
export function fileTypeStream(readableStream: NodeReadableStream, options?: FileTypeOptions & StreamOptions): Promise<ReadableStreamWithFileType>;
export function fileTypeStream(webStream: AnyWebByteStream, options?: FileTypeOptions & StreamOptions): Promise<AnyWebReadableByteStreamWithFileType>;
export * from './core.js';

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/**
Node.js specific entry point.
*/
import {ReadableStream as WebReadableStream} from 'node:stream/web';
import {pipeline, PassThrough, Readable} from 'node:stream';
import * as strtok3 from 'strtok3';
import {
FileTypeParser as DefaultFileTypeParser,
reasonableDetectionSizeInBytes,
normalizeSampleSize,
} from './core.js';
function isTokenizerStreamBoundsError(error) {
if (
!(error instanceof RangeError)
|| error.message !== 'offset is out of bounds'
|| typeof error.stack !== 'string'
) {
return false;
}
// Some malformed or non-byte Node.js streams can surface this tokenizer-internal range error.
// Note: This stack-trace check is fragile and may break if strtok3 restructures its internals.
return /strtok3[/\\]lib[/\\]stream[/\\]/.test(error.stack);
}
export class FileTypeParser extends DefaultFileTypeParser {
async fromStream(stream) {
const tokenizer = await (stream instanceof WebReadableStream ? strtok3.fromWebStream(stream, this.getTokenizerOptions()) : strtok3.fromStream(stream, this.getTokenizerOptions()));
try {
return await super.fromTokenizer(tokenizer);
} catch (error) {
if (isTokenizerStreamBoundsError(error)) {
return;
}
throw error;
} finally {
await tokenizer.close();
}
}
async fromFile(path) {
const tokenizer = await strtok3.fromFile(path);
try {
return await super.fromTokenizer(tokenizer);
} finally {
await tokenizer.close();
}
}
async toDetectionStream(readableStream, options = {}) {
if (!(readableStream instanceof Readable)) {
return super.toDetectionStream(readableStream, options);
}
const sampleSize = normalizeSampleSize(options.sampleSize ?? reasonableDetectionSizeInBytes);
return new Promise((resolve, reject) => {
readableStream.on('error', reject);
readableStream.once('readable', () => {
(async () => {
try {
// Set up output stream
const pass = new PassThrough();
const outputStream = pipeline ? pipeline(readableStream, pass, () => {}) : readableStream.pipe(pass);
// Read the input stream and detect the filetype
const chunk = readableStream.read(sampleSize) ?? readableStream.read() ?? new Uint8Array(0);
try {
pass.fileType = await this.fromBuffer(chunk);
} catch (error) {
if (error instanceof strtok3.EndOfStreamError) {
pass.fileType = undefined;
} else {
reject(error);
}
}
resolve(outputStream);
} catch (error) {
reject(error);
}
})();
});
});
}
}
export async function fileTypeFromFile(path, options) {
return (new FileTypeParser(options)).fromFile(path, options);
}
export async function fileTypeFromStream(stream, options) {
return (new FileTypeParser(options)).fromStream(stream);
}
export async function fileTypeStream(readableStream, options = {}) {
return new FileTypeParser(options).toDetectionStream(readableStream, options);
}
export {
fileTypeFromTokenizer,
fileTypeFromBuffer,
fileTypeFromBlob,
supportedMimeTypes,
supportedExtensions,
} from './core.js';

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MIT License
Copyright (c) Sindre Sorhus <sindresorhus@gmail.com> (https://sindresorhus.com)
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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{
"name": "file-type",
"version": "21.3.2",
"description": "Detect the file type of a file, stream, or data",
"license": "MIT",
"repository": "sindresorhus/file-type",
"funding": "https://github.com/sindresorhus/file-type?sponsor=1",
"author": {
"name": "Sindre Sorhus",
"email": "sindresorhus@gmail.com",
"url": "https://sindresorhus.com"
},
"type": "module",
"exports": {
".": {
"node": {
"types": "./index.d.ts",
"import": "./index.js",
"module-sync": "./index.js"
},
"default": {
"types": "./core.d.ts",
"import": "./core.js",
"module-sync": "./core.js"
}
},
"./core": {
"types": "./core.d.ts",
"default": "./core.js"
},
"./node": {
"types": "./index.d.ts",
"default": "./index.js"
}
},
"sideEffects": false,
"engines": {
"node": ">=20"
},
"scripts": {
"test": "xo && ava && tsd"
},
"files": [
"index.js",
"index.d.ts",
"core.js",
"core.d.ts",
"supported.js",
"util.js"
],
"keywords": [
"mime",
"file",
"type",
"magic",
"archive",
"image",
"img",
"pic",
"picture",
"flash",
"photo",
"video",
"detect",
"check",
"is",
"exif",
"elf",
"macho",
"exe",
"binary",
"buffer",
"uint8array",
"jpg",
"png",
"apng",
"gif",
"webp",
"flif",
"xcf",
"cr2",
"cr3",
"orf",
"arw",
"dng",
"nef",
"rw2",
"raf",
"tif",
"bmp",
"icns",
"jxr",
"psd",
"indd",
"zip",
"tar",
"rar",
"gz",
"bz2",
"7z",
"dmg",
"mp4",
"mid",
"mkv",
"webm",
"mov",
"avi",
"mpg",
"mp2",
"mp3",
"m4a",
"ogg",
"opus",
"flac",
"wav",
"amr",
"pdf",
"epub",
"mobi",
"swf",
"rtf",
"woff",
"woff2",
"eot",
"ttf",
"otf",
"ttc",
"ico",
"flv",
"ps",
"xz",
"sqlite",
"xpi",
"cab",
"deb",
"ar",
"rpm",
"Z",
"lz",
"cfb",
"mxf",
"mts",
"wasm",
"webassembly",
"blend",
"bpg",
"docx",
"pptx",
"xlsx",
"3gp",
"j2c",
"jp2",
"jpm",
"jpx",
"mj2",
"aif",
"odt",
"ods",
"odp",
"xml",
"heic",
"ics",
"glb",
"pcap",
"dsf",
"lnk",
"alias",
"voc",
"ac3",
"3g2",
"m4b",
"m4p",
"m4v",
"f4a",
"f4b",
"f4p",
"f4v",
"mie",
"qcp",
"asf",
"ogv",
"ogm",
"oga",
"spx",
"ogx",
"ape",
"wv",
"cur",
"nes",
"crx",
"ktx",
"dcm",
"mpc",
"arrow",
"shp",
"aac",
"mp1",
"it",
"s3m",
"xm",
"skp",
"avif",
"eps",
"lzh",
"pgp",
"asar",
"stl",
"chm",
"3mf",
"zst",
"jxl",
"vcf",
"jls",
"pst",
"dwg",
"parquet",
"class",
"arj",
"cpio",
"ace",
"avro",
"icc",
"fbx",
"vsdx",
"vtt",
"apk",
"drc",
"lz4",
"potx",
"xltx",
"dotx",
"xltm",
"ots",
"odg",
"otg",
"otp",
"ott",
"xlsm",
"docm",
"dotm",
"potm",
"pptm",
"jar",
"jmp",
"rm",
"sav",
"ppsm",
"ppsx",
"tar.gz",
"reg",
"dat"
],
"dependencies": {
"@tokenizer/inflate": "^0.4.1",
"strtok3": "^10.3.4",
"token-types": "^6.1.1",
"uint8array-extras": "^1.4.0"
},
"devDependencies": {
"@tokenizer/token": "^0.3.0",
"@types/node": "^25.3.3",
"ava": "^7.0.0",
"commonmark": "^0.31.2",
"get-stream": "^9.0.1",
"noop-stream": "^1.0.0",
"tsd": "^0.33.0",
"xo": "^0.60.0"
},
"xo": {
"envs": [
"node",
"browser"
],
"ignores": [
"fixture"
],
"rules": {
"no-inner-declarations": "warn",
"no-await-in-loop": "warn",
"no-bitwise": "off",
"@typescript-eslint/no-unsafe-assignment": "off",
"unicorn/text-encoding-identifier-case": "off",
"unicorn/switch-case-braces": "off",
"unicorn/prefer-top-level-await": "off"
}
},
"ava": {
"serial": true
}
}

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<h1 align="center" title="file-type">
<img src="media/logo.jpg" alt="file-type logo">
</h1>
> Detect the file type of a file, stream, or data
The file type is detected by checking the [magic number](https://en.wikipedia.org/wiki/Magic_number_(programming)#Magic_numbers_in_files) of the buffer.
This package is for detecting binary-based file formats, not text-based formats like `.txt`, `.csv`, `.svg`, etc.
We accept contributions for commonly used modern file formats, not historical or obscure ones. Open an issue first for discussion.
## Install
```sh
npm install file-type
```
**This package is an ESM package. Your project needs to be ESM too. [Read more](https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c). For TypeScript + CommonJS, see [`load-esm`](https://github.com/Borewit/load-esm).** If you use it with Webpack, you need the latest Webpack version and ensure you configure it correctly for ESM.
> [!IMPORTANT]
> File type detection is based on binary signatures (magic numbers) and is a best-effort hint. It does not guarantee the file is actually of that type or that the file is valid/not malformed.
>
> Robustness against malformed input is best-effort. When processing untrusted files on a server, enforce a reasonable file size limit and use a worker thread with a timeout (e.g., [`make-asynchronous`](https://github.com/sindresorhus/make-asynchronous)). These are not considered security issues in this package.
## Usage
### Node.js
Determine file type from a file:
```js
import {fileTypeFromFile} from 'file-type';
console.log(await fileTypeFromFile('Unicorn.png'));
//=> {ext: 'png', mime: 'image/png'}
```
Determine file type from a Uint8Array/ArrayBuffer, which may be a portion of the beginning of a file:
```js
import {fileTypeFromBuffer} from 'file-type';
import {readChunk} from 'read-chunk';
const buffer = await readChunk('Unicorn.png', {length: 4100});
console.log(await fileTypeFromBuffer(buffer));
//=> {ext: 'png', mime: 'image/png'}
```
Determine file type from a stream:
```js
import fs from 'node:fs';
import {fileTypeFromStream} from 'file-type';
const stream = fs.createReadStream('Unicorn.mp4');
console.log(await fileTypeFromStream(stream));
//=> {ext: 'mp4', mime: 'video/mp4'}
```
The stream method can also be used to read from a remote location:
```js
import got from 'got';
import {fileTypeFromStream} from 'file-type';
const url = 'https://upload.wikimedia.org/wikipedia/en/a/a9/Example.jpg';
const stream = got.stream(url);
console.log(await fileTypeFromStream(stream));
//=> {ext: 'jpg', mime: 'image/jpeg'}
```
Another stream example:
```js
import stream from 'node:stream';
import fs from 'node:fs';
import crypto from 'node:crypto';
import {fileTypeStream} from 'file-type';
const read = fs.createReadStream('encrypted.enc');
const decipher = crypto.createDecipheriv(alg, key, iv);
const streamWithFileType = await fileTypeStream(stream.pipeline(read, decipher));
console.log(streamWithFileType.fileType);
//=> {ext: 'mov', mime: 'video/quicktime'}
const write = fs.createWriteStream(`decrypted.${streamWithFileType.fileType.ext}`);
streamWithFileType.pipe(write);
```
### Browser
```js
import {fileTypeFromStream} from 'file-type';
const url = 'https://upload.wikimedia.org/wikipedia/en/a/a9/Example.jpg';
const response = await fetch(url);
const fileType = await fileTypeFromStream(response.body);
console.log(fileType);
//=> {ext: 'jpg', mime: 'image/jpeg'}
```
## API
### fileTypeFromBuffer(buffer, options)
Detect the file type of a `Uint8Array`, or `ArrayBuffer`.
The file type is detected by checking the [magic number](https://en.wikipedia.org/wiki/Magic_number_(programming)#Magic_numbers_in_files) of the buffer.
If file access is available, it is recommended to use `fileTypeFromFile()` instead.
Returns a `Promise` for an object with the detected file type:
- `ext` - One of the [supported file types](#supported-file-types)
- `mime` - The [MIME type](https://en.wikipedia.org/wiki/Internet_media_type)
Or `undefined` when there is no match.
#### buffer
Type: `Uint8Array | ArrayBuffer`
A buffer representing file data. It works best if the buffer contains the entire file. It may work with a smaller portion as well.
### fileTypeFromFile(filePath, options)
Detect the file type of a file path.
This is for Node.js only.
To read from a [`File`](https://developer.mozilla.org/docs/Web/API/File), see [`fileTypeFromBlob()`](#filetypefromblobblob-options).
The file type is detected by checking the [magic number](https://en.wikipedia.org/wiki/Magic_number_(programming)#Magic_numbers_in_files) of the buffer.
Returns a `Promise` for an object with the detected file type:
- `ext` - One of the [supported file types](#supported-file-types)
- `mime` - The [MIME type](https://en.wikipedia.org/wiki/Internet_media_type)
Or `undefined` when there is no match.
#### filePath
Type: `string`
The file path to parse.
### fileTypeFromStream(stream)
Detect the file type of a [web `ReadableStream`](https://developer.mozilla.org/en-US/docs/Web/API/ReadableStream).
If the engine is Node.js, this may also be a [Node.js `stream.Readable`](https://nodejs.org/api/stream.html#stream_class_stream_readable).
Direct support for Node.js streams will be dropped in the future, when Node.js streams can be converted to Web streams (see [`toWeb()`](https://nodejs.org/api/stream.html#streamreadabletowebstreamreadable-options)).
The file type is detected by checking the [magic number](https://en.wikipedia.org/wiki/Magic_number_(programming)#Magic_numbers_in_files) of the buffer.
Returns a `Promise` for an object with the detected file type:
- `ext` - One of the [supported file types](#supported-file-types)
- `mime` - The [MIME type](https://en.wikipedia.org/wiki/Internet_media_type)
Or `undefined` when there is no match.
#### stream
Type: [Web `ReadableStream`](https://developer.mozilla.org/en-US/docs/Web/API/ReadableStream) or [Node.js `stream.Readable`](https://nodejs.org/api/stream.html#stream_class_stream_readable)
A readable stream representing file data.
### fileTypeFromBlob(blob, options)
Detect the file type of a [`Blob`](https://developer.mozilla.org/docs/Web/API/Blob),
> [!TIP]
> A [`File` object](https://developer.mozilla.org/docs/Web/API/File) is a `Blob` and can be passed in here.
It will **stream** the underlying Blob.
The file type is detected by checking the [magic number](https://en.wikipedia.org/wiki/Magic_number_(programming)#Magic_numbers_in_files) of the blob.
Returns a `Promise` for an object with the detected file type:
- `ext` - One of the [supported file types](#supported-file-types)
- `mime` - The [MIME type](https://en.wikipedia.org/wiki/Internet_media_type)
Or `undefined` when there is no match.
```js
import {fileTypeFromBlob} from 'file-type';
const blob = new Blob(['<?xml version="1.0" encoding="ISO-8859-1" ?>'], {
type: 'text/plain',
endings: 'native'
});
console.log(await fileTypeFromBlob(blob));
//=> {ext: 'txt', mime: 'text/plain'}
```
#### blob
Type: [`Blob`](https://developer.mozilla.org/en-US/docs/Web/API/Blob)
### fileTypeFromTokenizer(tokenizer, options)
Detect the file type from an `ITokenizer` source.
This method is used internally, but can also be used for a special "tokenizer" reader.
A tokenizer propagates the internal read functions, allowing alternative transport mechanisms, to access files, to be implemented and used.
Returns a `Promise` for an object with the detected file type:
- `ext` - One of the [supported file types](#supported-file-types)
- `mime` - The [MIME type](https://en.wikipedia.org/wiki/Internet_media_type)
Or `undefined` when there is no match.
An example is [`@tokenizer/http`](https://github.com/Borewit/tokenizer-http), which requests data using [HTTP-range-requests](https://developer.mozilla.org/en-US/docs/Web/HTTP/Range_requests). A difference with a conventional stream and the [*tokenizer*](https://github.com/Borewit/strtok3#tokenizer), is that it can *ignore* (seek, fast-forward) in the stream. For example, you may only need and read the first 6 bytes, and the last 128 bytes, which may be an advantage in case reading the entire file would take longer.
```js
import {makeTokenizer} from '@tokenizer/http';
import {fileTypeFromTokenizer} from 'file-type';
const audioTrackUrl = 'https://test-audio.netlify.com/Various%20Artists%20-%202009%20-%20netBloc%20Vol%2024_%20tiuqottigeloot%20%5BMP3-V2%5D/01%20-%20Diablo%20Swing%20Orchestra%20-%20Heroines.mp3';
const httpTokenizer = await makeTokenizer(audioTrackUrl);
const fileType = await fileTypeFromTokenizer(httpTokenizer);
console.log(fileType);
//=> {ext: 'mp3', mime: 'audio/mpeg'}
```
Or use [`@tokenizer/s3`](https://github.com/Borewit/tokenizer-s3) to determine the file type of a file stored on [Amazon S3](https://aws.amazon.com/s3):
```js
import {S3Client} from '@aws-sdk/client-s3';
import {makeChunkedTokenizerFromS3} from '@tokenizer/s3';
import {fileTypeFromTokenizer} from 'file-type';
// Initialize the S3 client
// Initialize S3 client
const s3 = new S3Client();
// Initialize the S3 tokenizer.
const s3Tokenizer = await makeChunkedTokenizerFromS3(s3, {
Bucket: 'affectlab',
Key: '1min_35sec.mp4'
});
// Figure out what kind of file it is.
const fileType = await fileTypeFromTokenizer(s3Tokenizer);
console.log(fileType);
```
Note that only the minimum amount of data required to determine the file type is read (okay, just a bit extra to prevent too many fragmented reads).
#### tokenizer
Type: [`ITokenizer`](https://github.com/Borewit/strtok3#tokenizer)
A file source implementing the [tokenizer interface](https://github.com/Borewit/strtok3#tokenizer).
### fileTypeStream(webStream, options?)
Returns a `Promise` which resolves to the original readable stream argument, but with an added `fileType` property, which is an object like the one returned from `fileTypeFromFile()`.
This method can be handy to put in between a stream, but it comes with a price.
Internally `stream()` builds up a buffer of `sampleSize` bytes, used as a sample, to determine the file type.
The sample size impacts the file detection resolution.
A smaller sample size will result in lower probability of the best file type detection.
**Note:** When using Node.js, a `stream.Readable` may be provided as well.
#### readableStream
Type: [`stream.Readable`](https://nodejs.org/api/stream.html#stream_class_stream_readable)
#### options
Type: `object`
Supports the following options in addition to the [general options](#options):
##### sampleSize
Type: `number`\
Default: `4100`
The sample size in bytes.
#### Example
```js
import got from 'got';
import {fileTypeStream} from 'file-type';
const url = 'https://upload.wikimedia.org/wikipedia/en/a/a9/Example.jpg';
const stream1 = got.stream(url);
const stream2 = await fileTypeStream(stream1, {sampleSize: 1024});
if (stream2.fileType?.mime === 'image/jpeg') {
// stream2 can be used to stream the JPEG image (from the very beginning of the stream)
}
```
#### readableStream
Type: [`stream.Readable`](https://nodejs.org/api/stream.html#stream_class_stream_readable)
The input stream.
### supportedExtensions
Returns a `Set<string>` of supported file extensions.
### supportedMimeTypes
Returns a `Set<string>` of supported MIME types.
### Options
#### customDetectors
Array of custom file type detectors to run before default detectors.
For example:
```js
import {fileTypeFromFile} from 'file-type';
import {detectXml} from '@file-type/xml';
const fileType = await fileTypeFromFile('sample.kml', {customDetectors: [detectXml]});
console.log(fileType);
```
#### mpegOffsetTolerance
Default: `0`
Specifies the byte tolerance for locating the first MPEG audio frame (e.g. `.mp1`, `.mp2`, `.mp3`, `.aac`).
Allows detection to handle slight sync offsets between the expected and actual frame start. Common in malformed or incorrectly muxed files, which, while technically invalid, do occur in the wild.
A tolerance of 10 bytes covers most cases.
## Custom detectors
Custom file type detectors are plugins designed to extend the default detection capabilities.
They allow support for uncommon file types, non-binary formats, or customized detection behavior.
Detectors can be added via the constructor options or by modifying `FileTypeParser#detectors` directly.
Detectors provided through the constructor are executed before the default ones.
Detectors can be added via the constructor options or by directly modifying `FileTypeParser#detectors`.
### Example adding a detector
For example:
```js
import {FileTypeParser} from 'file-type';
import {detectXml} from '@file-type/xml';
const parser = new FileTypeParser({customDetectors: [detectXml]});
const fileType = await parser.fromFile('sample.kml');
console.log(fileType);
```
### Available third-party file-type detectors
- [@file-type/av](https://github.com/Borewit/file-type-av): Improves detection of audio and video file formats, with accurate differentiation between the two
- [@file-type/cfbf](https://github.com/Borewit/file-type-cfbf): Detects Compound File Binary Format (CFBF) based formats, such as Office 97–2003 documents and `.msi`.
- [@file-type/pdf](https://github.com/Borewit/file-type-pdf): Detects PDF based file types, such as Adobe Illustrator
- [@file-type/xml](https://github.com/Borewit/file-type-xml): Detects common XML file types, such as GLM, KML, MusicXML, RSS, SVG, and XHTML
### Detector execution flow
If a detector returns `undefined`, the following rules apply:
1. **No Tokenizer Interaction**: If the detector does not modify the tokenizer's position, the next detector in the sequence is executed.
2. **Tokenizer Interaction**: If the detector modifies the tokenizer's position (`tokenizer.position` is advanced), no further detectors are executed. In this case, the file type remains `undefined`, as subsequent detectors cannot evaluate the content. This is an exceptional scenario, as it prevents any other detectors from determining the file type.
### Writing your own custom detector
Below is an example of a custom detector array. This can be passed to the `FileTypeParser` via the `fileTypeOptions` argument.
```js
import {FileTypeParser} from 'file-type';
const unicornDetector = {
id: 'unicorn', // May be used to recognize the detector in the detector list
async detect(tokenizer) {
const unicornHeader = [85, 78, 73, 67, 79, 82, 78]; // "UNICORN" in ASCII decimal
const buffer = new Uint8Array(unicornHeader.length);
await tokenizer.peekBuffer(buffer, {length: unicornHeader.length, mayBeLess: true});
if (unicornHeader.every((value, index) => value === buffer[index])) {
return {ext: 'unicorn', mime: 'application/unicorn'};
}
return undefined;
}
}
const buffer = new Uint8Array([85, 78, 73, 67, 79, 82, 78]);
const parser = new FileTypeParser({customDetectors: [unicornDetector]});
const fileType = await parser.fromBuffer(buffer);
console.log(fileType); // {ext: 'unicorn', mime: 'application/unicorn'}
```
```ts
/**
@param tokenizer - The [tokenizer](https://github.com/Borewit/strtok3#tokenizer) used to read file content.
@param fileType - The file type detected by standard or previous custom detectors, or `undefined` if no match is found.
@returns The detected file type, or `undefined` if no match is found.
*/
export type Detector = (tokenizer: ITokenizer, fileType?: FileTypeResult) => Promise<FileTypeResult | undefined>;
```
## Abort signal
Some async operations can be aborted by passing an [`AbortSignal`](https://developer.mozilla.org/en-US/docs/Web/API/AbortSignal) to the `FileTypeParser` constructor.
```js
import {FileTypeParser} from 'file-type';
const abortController = new AbortController()
const parser = new FileTypeParser({abortSignal: abortController.signal});
const promise = parser.fromStream(blob.stream());
abortController.abort(); // Abort file-type reading from the Blob stream.
```
## Supported file types
- [`3g2`](https://en.wikipedia.org/wiki/3GP_and_3G2#3G2) - Multimedia container format defined by the 3GPP2 for 3G CDMA2000 multimedia services
- [`3gp`](https://en.wikipedia.org/wiki/3GP_and_3G2#3GP) - Multimedia container format defined by the Third Generation Partnership Project (3GPP) for 3G UMTS multimedia services
- [`3mf`](https://en.wikipedia.org/wiki/3D_Manufacturing_Format) - 3D Manufacturing Format
- [`7z`](https://en.wikipedia.org/wiki/7z) - 7-Zip archive
- [`Z`](https://fileinfo.com/extension/z) - Unix Compressed File
- [`aac`](https://en.wikipedia.org/wiki/Advanced_Audio_Coding) - Advanced Audio Coding
- [`ac3`](https://www.atsc.org/standard/a522012-digital-audio-compression-ac-3-e-ac-3-standard-12172012/) - ATSC A/52 Audio File
- [`ace`](https://en.wikipedia.org/wiki/ACE_(compressed_file_format)) - ACE archive
- [`aif`](https://en.wikipedia.org/wiki/Audio_Interchange_File_Format) - Audio Interchange file
- [`alias`](https://en.wikipedia.org/wiki/Alias_%28Mac_OS%29) - macOS Alias file
- [`amr`](https://en.wikipedia.org/wiki/Adaptive_Multi-Rate_audio_codec) - Adaptive Multi-Rate audio codec
- [`ape`](https://en.wikipedia.org/wiki/Monkey%27s_Audio) - Monkey's Audio
- [`apk`](https://en.wikipedia.org/wiki/Apk_(file_format)) - Android package format
- [`apng`](https://en.wikipedia.org/wiki/APNG) - Animated Portable Network Graphics
- [`ar`](https://en.wikipedia.org/wiki/Ar_(Unix)) - Archive file
- [`arj`](https://en.wikipedia.org/wiki/ARJ) - Archive file
- [`arrow`](https://arrow.apache.org) - Columnar format for tables of data
- [`arw`](https://en.wikipedia.org/wiki/Raw_image_format#ARW) - Sony Alpha Raw image file
- [`asar`](https://github.com/electron/asar#format) - Archive format primarily used to enclose Electron applications
- [`asf`](https://en.wikipedia.org/wiki/Advanced_Systems_Format) - Advanced Systems Format
- [`avi`](https://en.wikipedia.org/wiki/Audio_Video_Interleave) - Audio Video Interleave file
- [`avif`](https://en.wikipedia.org/wiki/AV1#AV1_Image_File_Format_(AVIF)) - AV1 Image File Format
- [`avro`](https://en.wikipedia.org/wiki/Apache_Avro#Avro_Object_Container_File) - Object container file developed by Apache Avro
- [`blend`](https://wiki.blender.org/index.php/Dev:Source/Architecture/File_Format) - Blender project
- [`bmp`](https://en.wikipedia.org/wiki/BMP_file_format) - Bitmap image file
- [`bpg`](https://bellard.org/bpg/) - Better Portable Graphics file
- [`bz2`](https://en.wikipedia.org/wiki/Bzip2) - Archive file
- [`cab`](https://en.wikipedia.org/wiki/Cabinet_(file_format)) - Cabinet file
- [`cfb`](https://en.wikipedia.org/wiki/Compound_File_Binary_Format) - Compound File Binary Format
- [`chm`](https://en.wikipedia.org/wiki/Microsoft_Compiled_HTML_Help) - Microsoft Compiled HTML Help
- [`class`](https://en.wikipedia.org/wiki/Java_class_file) - Java class file
- [`cpio`](https://en.wikipedia.org/wiki/Cpio) - Cpio archive
- [`cr2`](https://fileinfo.com/extension/cr2) - Canon Raw image file (v2)
- [`cr3`](https://fileinfo.com/extension/cr3) - Canon Raw image file (v3)
- [`crx`](https://developer.chrome.com/extensions/crx) - Google Chrome extension
- [`cur`](https://en.wikipedia.org/wiki/ICO_(file_format)) - Icon file
- [`dat`](https://en.wikipedia.org/wiki/Windows_Registry) - Windows registry hive file
- [`dcm`](https://en.wikipedia.org/wiki/DICOM#Data_format) - DICOM Image File
- [`deb`](https://en.wikipedia.org/wiki/Deb_(file_format)) - Debian package
- [`dmg`](https://en.wikipedia.org/wiki/Apple_Disk_Image) - Apple Disk Image
- [`dng`](https://en.wikipedia.org/wiki/Digital_Negative) - Adobe Digital Negative image file
- [`docm`](https://en.wikipedia.org/wiki/List_of_Microsoft_Office_filename_extensions) - Microsoft Word macro-enabled document
- [`docx`](https://en.wikipedia.org/wiki/Office_Open_XML) - Microsoft Word document
- [`dotm`](https://en.wikipedia.org/wiki/List_of_Microsoft_Office_filename_extensions) - Microsoft Word macro-enabled template
- [`dotx`](https://en.wikipedia.org/wiki/List_of_Microsoft_Office_filename_extensions) - Microsoft Word template
- [`drc`](https://en.wikipedia.org/wiki/Zstandard) - Google's Draco 3D Data Compression
- [`dsf`](https://dsd-guide.com/sites/default/files/white-papers/DSFFileFormatSpec_E.pdf) - Sony DSD Stream File (DSF)
- [`dwg`](https://en.wikipedia.org/wiki/.dwg) - Autodesk CAD file
- [`elf`](https://en.wikipedia.org/wiki/Executable_and_Linkable_Format) - Unix Executable and Linkable Format
- [`eot`](https://en.wikipedia.org/wiki/Embedded_OpenType) - Embedded OpenType font
- [`eps`](https://en.wikipedia.org/wiki/Encapsulated_PostScript) - Encapsulated PostScript
- [`epub`](https://en.wikipedia.org/wiki/EPUB) - E-book file
- [`exe`](https://en.wikipedia.org/wiki/.exe) - Executable file
- [`f4a`](https://en.wikipedia.org/wiki/Flash_Video) - Audio-only ISO base media file format used by Adobe Flash Player
- [`f4b`](https://en.wikipedia.org/wiki/Flash_Video) - Audiobook and podcast ISO base media file format used by Adobe Flash Player
- [`f4p`](https://en.wikipedia.org/wiki/Flash_Video) - ISO base media file format protected by Adobe Access DRM used by Adobe Flash Player
- [`f4v`](https://en.wikipedia.org/wiki/Flash_Video) - ISO base media file format used by Adobe Flash Player
- [`fbx`](https://en.wikipedia.org/wiki/FBX) - Filmbox is a proprietary file format used to provide interoperability between digital content creation apps.
- [`flac`](https://en.wikipedia.org/wiki/FLAC) - Free Lossless Audio Codec
- [`flif`](https://en.wikipedia.org/wiki/Free_Lossless_Image_Format) - Free Lossless Image Format
- [`flv`](https://en.wikipedia.org/wiki/Flash_Video) - Flash video
- [`gif`](https://en.wikipedia.org/wiki/GIF) - Graphics Interchange Format
- [`glb`](https://github.com/KhronosGroup/glTF) - GL Transmission Format
- [`gz`](https://en.wikipedia.org/wiki/Gzip) - Archive file
- [`heic`](https://nokiatech.github.io/heif/technical.html) - High Efficiency Image File Format
- [`icc`](https://en.wikipedia.org/wiki/ICC_profile) - ICC Profile
- [`icns`](https://en.wikipedia.org/wiki/Apple_Icon_Image_format) - Apple Icon image
- [`ico`](https://en.wikipedia.org/wiki/ICO_(file_format)) - Windows icon file
- [`ics`](https://en.wikipedia.org/wiki/ICalendar#Data_format) - iCalendar
- [`indd`](https://en.wikipedia.org/wiki/Adobe_InDesign#File_format) - Adobe InDesign document
- [`it`](https://wiki.openmpt.org/Manual:_Module_formats#The_Impulse_Tracker_format_.28.it.29) - Audio module format: Impulse Tracker
- [`j2c`](https://en.wikipedia.org/wiki/JPEG_2000) - JPEG 2000
- [`jar`](https://en.wikipedia.org/wiki/JAR_(file_format)) - Java archive
- [`jls`](https://en.wikipedia.org/wiki/Lossless_JPEG#JPEG-LS) - Lossless/near-lossless compression standard for continuous-tone images
- [`jmp`](https://en.wikipedia.org/wiki/JMP_(statistical_software)) - JMP data file format by SAS Institute
- [`jp2`](https://en.wikipedia.org/wiki/JPEG_2000) - JPEG 2000
- [`jpg`](https://en.wikipedia.org/wiki/JPEG) - Joint Photographic Experts Group image
- [`jpm`](https://en.wikipedia.org/wiki/JPEG_2000) - JPEG 2000
- [`jpx`](https://en.wikipedia.org/wiki/JPEG_2000) - JPEG 2000
- [`jxl`](https://en.wikipedia.org/wiki/JPEG_XL) - JPEG XL image format
- [`jxr`](https://en.wikipedia.org/wiki/JPEG_XR) - Joint Photographic Experts Group extended range
- [`ktx`](https://www.khronos.org/opengles/sdk/tools/KTX/file_format_spec/) - OpenGL and OpenGL ES textures
- [`lnk`](https://en.wikipedia.org/wiki/Shortcut_%28computing%29#Microsoft_Windows) - Microsoft Windows file shortcut
- [`lz`](https://en.wikipedia.org/wiki/Lzip) - Archive file
- [`lz4`](https://en.wikipedia.org/wiki/LZ4_(compression_algorithm)) - Compressed archive created by one of a variety of LZ4 compression utilities
- [`lzh`](https://en.wikipedia.org/wiki/LHA_(file_format)) - LZH archive
- [`m4a`](https://en.wikipedia.org/wiki/M4A) - Audio-only MPEG-4 files
- [`m4b`](https://en.wikipedia.org/wiki/M4B) - Audiobook and podcast MPEG-4 files, which also contain metadata including chapter markers, images, and hyperlinks
- [`m4p`](https://en.wikipedia.org/wiki/MPEG-4_Part_14#Filename_extensions) - MPEG-4 files with audio streams encrypted by FairPlay Digital Rights Management as were sold through the iTunes Store
- [`m4v`](https://en.wikipedia.org/wiki/M4V) - Video container format developed by Apple, which is very similar to the MP4 format
- [`macho`](https://en.wikipedia.org/wiki/Mach-O) - Mach-O binary format
- [`mid`](https://en.wikipedia.org/wiki/MIDI) - Musical Instrument Digital Interface file
- [`mie`](https://en.wikipedia.org/wiki/Sidecar_file) - Dedicated meta information format which supports storage of binary as well as textual meta information
- [`mj2`](https://en.wikipedia.org/wiki/Motion_JPEG_2000) - Motion JPEG 2000
- [`mkv`](https://en.wikipedia.org/wiki/Matroska) - Matroska video file
- [`mobi`](https://en.wikipedia.org/wiki/Mobipocket) - Mobipocket
- [`mov`](https://en.wikipedia.org/wiki/QuickTime_File_Format) - QuickTime video file
- [`mp1`](https://en.wikipedia.org/wiki/MPEG-1_Audio_Layer_I) - MPEG-1 Audio Layer I
- [`mp2`](https://en.wikipedia.org/wiki/MPEG-1_Audio_Layer_II) - MPEG-1 Audio Layer II
- [`mp3`](https://en.wikipedia.org/wiki/MP3) - Audio file
- [`mp4`](https://en.wikipedia.org/wiki/MPEG-4_Part_14#Filename_extensions) - MPEG-4 Part 14 video file
- [`mpc`](https://en.wikipedia.org/wiki/Musepack) - Musepack (SV7 & SV8)
- [`mpg`](https://en.wikipedia.org/wiki/MPEG-1) - MPEG-1 file
- [`mts`](https://en.wikipedia.org/wiki/.m2ts) - MPEG-2 Transport Stream, both raw and Blu-ray Disc Audio-Video (BDAV) versions
- [`mxf`](https://en.wikipedia.org/wiki/Material_Exchange_Format) - Material Exchange Format
- [`nef`](https://www.nikonusa.com/en/learn-and-explore/a/products-and-innovation/nikon-electronic-format-nef.html) - Nikon Electronic Format image file
- [`nes`](https://fileinfo.com/extension/nes) - Nintendo NES ROM
- [`odg`](https://en.wikipedia.org/wiki/OpenDocument) - OpenDocument for drawing
- [`odp`](https://en.wikipedia.org/wiki/OpenDocument) - OpenDocument for presentations
- [`ods`](https://en.wikipedia.org/wiki/OpenDocument) - OpenDocument for spreadsheets
- [`odt`](https://en.wikipedia.org/wiki/OpenDocument) - OpenDocument for word processing
- [`oga`](https://en.wikipedia.org/wiki/Ogg) - Audio file
- [`ogg`](https://en.wikipedia.org/wiki/Ogg) - Audio file
- [`ogm`](https://en.wikipedia.org/wiki/Ogg) - Audio file
- [`ogv`](https://en.wikipedia.org/wiki/Ogg) - Audio file
- [`ogx`](https://en.wikipedia.org/wiki/Ogg) - Audio file
- [`opus`](https://en.wikipedia.org/wiki/Opus_(audio_format)) - Audio file
- [`orf`](https://en.wikipedia.org/wiki/ORF_format) - Olympus Raw image file
- [`otf`](https://en.wikipedia.org/wiki/OpenType) - OpenType font
- [`otg`](https://en.wikipedia.org/wiki/OpenDocument_technical_specification#Templates) - OpenDocument template for drawing
- [`otp`](https://en.wikipedia.org/wiki/OpenDocument_technical_specification#Templates) - OpenDocument template for presentations
- [`ots`](https://en.wikipedia.org/wiki/OpenDocument_technical_specification#Templates) - OpenDocument template for spreadsheets
- [`ott`](https://en.wikipedia.org/wiki/OpenDocument_technical_specification#Templates) - OpenDocument template for word processing
- [`parquet`](https://en.wikipedia.org/wiki/Apache_Parquet) - Apache Parquet
- [`pcap`](https://wiki.wireshark.org/Development/LibpcapFileFormat) - Libpcap File Format
- [`pdf`](https://en.wikipedia.org/wiki/Portable_Document_Format) - Portable Document Format
- [`pgp`](https://en.wikipedia.org/wiki/Pretty_Good_Privacy) - Pretty Good Privacy
- [`png`](https://en.wikipedia.org/wiki/Portable_Network_Graphics) - Portable Network Graphics
- [`potm`](https://en.wikipedia.org/wiki/List_of_Microsoft_Office_filename_extensions) - Microsoft PowerPoint macro-enabled template
- [`potx`](https://en.wikipedia.org/wiki/List_of_Microsoft_Office_filename_extensions) - Microsoft PowerPoint template
- [`ppsm`](https://en.wikipedia.org/wiki/List_of_Microsoft_Office_filename_extensions#PowerPoint) - Office PowerPoint 2007 macro-enabled slide show
- [`ppsx`](https://en.wikipedia.org/wiki/List_of_Microsoft_Office_filename_extensions#PowerPoint) - Office PowerPoint 2007 slide show
- [`pptm`](https://en.wikipedia.org/wiki/List_of_Microsoft_Office_filename_extensions) - Microsoft PowerPoint macro-enabled document
- [`pptx`](https://en.wikipedia.org/wiki/Office_Open_XML) - Microsoft PowerPoint document
- [`ps`](https://en.wikipedia.org/wiki/Postscript) - Postscript
- [`psd`](https://en.wikipedia.org/wiki/Adobe_Photoshop#File_format) - Adobe Photoshop document
- [`pst`](https://en.wikipedia.org/wiki/Personal_Storage_Table) - Personal Storage Table file
- [`qcp`](https://en.wikipedia.org/wiki/QCP) - Tagged and chunked data
- [`raf`](https://en.wikipedia.org/wiki/Raw_image_format) - Fujifilm RAW image file
- [`rar`](https://en.wikipedia.org/wiki/RAR_(file_format)) - Archive file
- [`reg`](https://en.wikipedia.org/wiki/Windows_Registry) - Windows registry (entries) file format
- [`rm`](https://en.wikipedia.org/wiki/RealMedia) - RealMedia
- [`rpm`](https://fileinfo.com/extension/rpm) - Red Hat Package Manager file
- [`rtf`](https://en.wikipedia.org/wiki/Rich_Text_Format) - Rich Text Format
- [`rw2`](https://en.wikipedia.org/wiki/Raw_image_format) - Panasonic RAW image file
- [`s3m`](https://wiki.openmpt.org/Manual:_Module_formats#The_ScreamTracker_3_format_.28.s3m.29) - Audio module format: ScreamTracker 3
- [`sav`](https://en.wikipedia.org/wiki/SPSS) - SPSS Statistical Data File
- [`shp`](https://en.wikipedia.org/wiki/Shapefile) - Geospatial vector data format
- [`skp`](https://en.wikipedia.org/wiki/SketchUp) - SketchUp
- [`spx`](https://en.wikipedia.org/wiki/Ogg) - Audio file
- [`sqlite`](https://www.sqlite.org/fileformat2.html) - SQLite file
- [`stl`](https://en.wikipedia.org/wiki/STL_(file_format)) - Standard Tesselated Geometry File Format (ASCII only)
- [`swf`](https://en.wikipedia.org/wiki/SWF) - Adobe Flash Player file
- [`tar`](https://en.wikipedia.org/wiki/Tar_(computing)#File_format) - Tape archive or tarball
- [`tar.gz`](https://en.wikipedia.org/wiki/Gzip) - Gzipped tape archive (tarball)
- [`tif`](https://en.wikipedia.org/wiki/Tagged_Image_File_Format) - Tagged Image file
- [`ttc`](https://en.wikipedia.org/wiki/TrueType#TrueType_Collection) - TrueType Collection font
- [`ttf`](https://en.wikipedia.org/wiki/TrueType) - TrueType font
- [`vcf`](https://en.wikipedia.org/wiki/VCard) - vCard
- [`voc`](https://wiki.multimedia.cx/index.php/Creative_Voice) - Creative Voice File
- [`vsdx`](https://en.wikipedia.org/wiki/Microsoft_Visio) - Microsoft Visio File
- [`vtt`](https://en.wikipedia.org/wiki/WebVTT) - WebVTT File (for video captions)
- [`wasm`](https://en.wikipedia.org/wiki/WebAssembly) - WebAssembly intermediate compiled format
- [`wav`](https://en.wikipedia.org/wiki/WAV) - Waveform Audio file
- [`webm`](https://en.wikipedia.org/wiki/WebM) - Web video file
- [`webp`](https://en.wikipedia.org/wiki/WebP) - Web Picture format
- [`woff`](https://en.wikipedia.org/wiki/Web_Open_Font_Format) - Web Open Font Format
- [`woff2`](https://en.wikipedia.org/wiki/Web_Open_Font_Format) - Web Open Font Format
- [`wv`](https://en.wikipedia.org/wiki/WavPack) - WavPack
- [`xcf`](https://en.wikipedia.org/wiki/XCF_(file_format)) - eXperimental Computing Facility
- [`xlsm`](https://en.wikipedia.org/wiki/List_of_Microsoft_Office_filename_extensions) - Microsoft Excel macro-enabled document
- [`xlsx`](https://en.wikipedia.org/wiki/Office_Open_XML) - Microsoft Excel document
- [`xltm`](https://en.wikipedia.org/wiki/List_of_Microsoft_Office_filename_extensions) - Microsoft Excel macro-enabled template
- [`xltx`](https://en.wikipedia.org/wiki/List_of_Microsoft_Office_filename_extensions) - Microsoft Excel template
- [`xm`](https://wiki.openmpt.org/Manual:_Module_formats#The_FastTracker_2_format_.28.xm.29) - Audio module format: FastTracker 2
- [`xml`](https://en.wikipedia.org/wiki/XML) - eXtensible Markup Language
- [`xpi`](https://en.wikipedia.org/wiki/XPInstall) - XPInstall file
- [`xz`](https://en.wikipedia.org/wiki/Xz) - Compressed file
- [`zip`](https://en.wikipedia.org/wiki/Zip_(file_format)) - Archive file
- [`zst`](https://en.wikipedia.org/wiki/Zstandard) - Archive file
*[Pull requests](.github/pull_request_template.md) are welcome for additional commonly used file types.*
The following file types will not be accepted, but most of them are supported by [third-party detector](#available-third-party-file-type-detectors)
- [MS-CFB: Microsoft Compound File Binary File Format based formats](https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-cfb/53989ce4-7b05-4f8d-829b-d08d6148375b)
- `.doc` - Microsoft Word 97-2003 Document
- `.xls` - Microsoft Excel 97-2003 Document
- `.ppt` - Microsoft PowerPoint97-2003 Document
- `.msi` - Microsoft Windows Installer
- `.csv` - [Reason.](https://github.com/sindresorhus/file-type/issues/264#issuecomment-568439196)
- `.svg`
#### tokenizer
Type: [`ITokenizer`](https://github.com/Borewit/strtok3#tokenizer)
Usable as source of the examined file.
#### fileType
Type: `FileTypeResult`
An object having an `ext` (extension) and `mime` (mime type) property.
Detected by the standard detections or a previous custom detection. Undefined if no matching fileTypeResult could be found.
## Related
- [file-type-cli](https://github.com/sindresorhus/file-type-cli) - CLI for this module
- [image-dimensions](https://github.com/sindresorhus/image-dimensions) - Get the dimensions of an image
## Maintainers
- [Sindre Sorhus](https://github.com/sindresorhus)
- [Borewit](https://github.com/Borewit)

360
node_modules/file-type/supported.js generated vendored Normal file
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export const extensions = [
'jpg',
'png',
'apng',
'gif',
'webp',
'flif',
'xcf',
'cr2',
'cr3',
'orf',
'arw',
'dng',
'nef',
'rw2',
'raf',
'tif',
'bmp',
'icns',
'jxr',
'psd',
'indd',
'zip',
'tar',
'rar',
'gz',
'bz2',
'7z',
'dmg',
'mp4',
'mid',
'mkv',
'webm',
'mov',
'avi',
'mpg',
'mp2',
'mp3',
'm4a',
'oga',
'ogg',
'ogv',
'opus',
'flac',
'wav',
'spx',
'amr',
'pdf',
'epub',
'elf',
'macho',
'exe',
'swf',
'rtf',
'wasm',
'woff',
'woff2',
'eot',
'ttf',
'otf',
'ttc',
'ico',
'flv',
'ps',
'xz',
'sqlite',
'nes',
'crx',
'xpi',
'cab',
'deb',
'ar',
'rpm',
'Z',
'lz',
'cfb',
'mxf',
'mts',
'blend',
'bpg',
'docx',
'pptx',
'xlsx',
'3gp',
'3g2',
'j2c',
'jp2',
'jpm',
'jpx',
'mj2',
'aif',
'qcp',
'odt',
'ods',
'odp',
'xml',
'mobi',
'heic',
'cur',
'ktx',
'ape',
'wv',
'dcm',
'ics',
'glb',
'pcap',
'dsf',
'lnk',
'alias',
'voc',
'ac3',
'm4v',
'm4p',
'm4b',
'f4v',
'f4p',
'f4b',
'f4a',
'mie',
'asf',
'ogm',
'ogx',
'mpc',
'arrow',
'shp',
'aac',
'mp1',
'it',
's3m',
'xm',
'skp',
'avif',
'eps',
'lzh',
'pgp',
'asar',
'stl',
'chm',
'3mf',
'zst',
'jxl',
'vcf',
'jls',
'pst',
'dwg',
'parquet',
'class',
'arj',
'cpio',
'ace',
'avro',
'icc',
'fbx',
'vsdx',
'vtt',
'apk',
'drc',
'lz4',
'potx',
'xltx',
'dotx',
'xltm',
'ott',
'ots',
'otp',
'odg',
'otg',
'xlsm',
'docm',
'dotm',
'potm',
'pptm',
'jar',
'jmp',
'rm',
'sav',
'ppsm',
'ppsx',
'tar.gz',
'reg',
'dat',
];
export const mimeTypes = [
'image/jpeg',
'image/png',
'image/gif',
'image/webp',
'image/flif',
'image/x-xcf',
'image/x-canon-cr2',
'image/x-canon-cr3',
'image/tiff',
'image/bmp',
'image/vnd.ms-photo',
'image/vnd.adobe.photoshop',
'application/x-indesign',
'application/epub+zip',
'application/x-xpinstall',
'application/vnd.ms-powerpoint.slideshow.macroenabled.12',
'application/vnd.oasis.opendocument.text',
'application/vnd.oasis.opendocument.spreadsheet',
'application/vnd.oasis.opendocument.presentation',
'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
'application/vnd.openxmlformats-officedocument.presentationml.presentation',
'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
'application/vnd.openxmlformats-officedocument.presentationml.slideshow',
'application/zip',
'application/x-tar',
'application/x-rar-compressed',
'application/gzip',
'application/x-bzip2',
'application/x-7z-compressed',
'application/x-apple-diskimage',
'application/vnd.apache.arrow.file',
'video/mp4',
'audio/midi',
'video/matroska',
'video/webm',
'video/quicktime',
'video/vnd.avi',
'audio/wav',
'audio/qcelp',
'audio/x-ms-asf',
'video/x-ms-asf',
'application/vnd.ms-asf',
'video/mpeg',
'video/3gpp',
'audio/mpeg',
'audio/mp4', // RFC 4337
'video/ogg',
'audio/ogg',
'audio/ogg; codecs=opus',
'application/ogg',
'audio/flac',
'audio/ape',
'audio/wavpack',
'audio/amr',
'application/pdf',
'application/x-elf',
'application/x-mach-binary',
'application/x-msdownload',
'application/x-shockwave-flash',
'application/rtf',
'application/wasm',
'font/woff',
'font/woff2',
'application/vnd.ms-fontobject',
'font/ttf',
'font/otf',
'font/collection',
'image/x-icon',
'video/x-flv',
'application/postscript',
'application/eps',
'application/x-xz',
'application/x-sqlite3',
'application/x-nintendo-nes-rom',
'application/x-google-chrome-extension',
'application/vnd.ms-cab-compressed',
'application/x-deb',
'application/x-unix-archive',
'application/x-rpm',
'application/x-compress',
'application/x-lzip',
'application/x-cfb',
'application/x-mie',
'application/mxf',
'video/mp2t',
'application/x-blender',
'image/bpg',
'image/j2c',
'image/jp2',
'image/jpx',
'image/jpm',
'image/mj2',
'audio/aiff',
'application/xml',
'application/x-mobipocket-ebook',
'image/heif',
'image/heif-sequence',
'image/heic',
'image/heic-sequence',
'image/icns',
'image/ktx',
'application/dicom',
'audio/x-musepack',
'text/calendar',
'text/vcard',
'text/vtt',
'model/gltf-binary',
'application/vnd.tcpdump.pcap',
'audio/x-dsf', // Non-standard
'application/x.ms.shortcut', // Invented by us
'application/x.apple.alias', // Invented by us
'audio/x-voc',
'audio/vnd.dolby.dd-raw',
'audio/x-m4a',
'image/apng',
'image/x-olympus-orf',
'image/x-sony-arw',
'image/x-adobe-dng',
'image/x-nikon-nef',
'image/x-panasonic-rw2',
'image/x-fujifilm-raf',
'video/x-m4v',
'video/3gpp2',
'application/x-esri-shape',
'audio/aac',
'audio/x-it',
'audio/x-s3m',
'audio/x-xm',
'video/MP1S',
'video/MP2P',
'application/vnd.sketchup.skp',
'image/avif',
'application/x-lzh-compressed',
'application/pgp-encrypted',
'application/x-asar',
'model/stl',
'application/vnd.ms-htmlhelp',
'model/3mf',
'image/jxl',
'application/zstd',
'image/jls',
'application/vnd.ms-outlook',
'image/vnd.dwg',
'application/vnd.apache.parquet',
'application/java-vm',
'application/x-arj',
'application/x-cpio',
'application/x-ace-compressed',
'application/avro',
'application/vnd.iccprofile',
'application/x.autodesk.fbx', // Invented by us
'application/vnd.visio',
'application/vnd.android.package-archive',
'application/vnd.google.draco', // Invented by us
'application/x-lz4', // Invented by us
'application/vnd.openxmlformats-officedocument.presentationml.template',
'application/vnd.openxmlformats-officedocument.spreadsheetml.template',
'application/vnd.openxmlformats-officedocument.wordprocessingml.template',
'application/vnd.ms-excel.template.macroenabled.12',
'application/vnd.oasis.opendocument.text-template',
'application/vnd.oasis.opendocument.spreadsheet-template',
'application/vnd.oasis.opendocument.presentation-template',
'application/vnd.oasis.opendocument.graphics',
'application/vnd.oasis.opendocument.graphics-template',
'application/vnd.ms-excel.sheet.macroenabled.12',
'application/vnd.ms-word.document.macroenabled.12',
'application/vnd.ms-word.template.macroenabled.12',
'application/vnd.ms-powerpoint.template.macroenabled.12',
'application/vnd.ms-powerpoint.presentation.macroenabled.12',
'application/java-archive',
'application/vnd.rn-realmedia',
'application/x-spss-sav',
'application/x-ms-regedit',
'application/x-ft-windows-registry-hive',
'application/x-jmp-data',
];

60
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import {StringType} from 'token-types';
export function stringToBytes(string, encoding) {
if (encoding === 'utf-16le') {
const bytes = [];
for (let index = 0; index < string.length; index++) {
const code = string.charCodeAt(index); // eslint-disable-line unicorn/prefer-code-point
bytes.push(code & 0xFF, (code >> 8) & 0xFF); // High byte
}
return bytes;
}
if (encoding === 'utf-16be') {
const bytes = [];
for (let index = 0; index < string.length; index++) {
const code = string.charCodeAt(index); // eslint-disable-line unicorn/prefer-code-point
bytes.push((code >> 8) & 0xFF, code & 0xFF); // Low byte
}
return bytes;
}
return [...string].map(character => character.charCodeAt(0)); // eslint-disable-line unicorn/prefer-code-point
}
/**
Checks whether the TAR checksum is valid.
@param {Uint8Array} arrayBuffer - The TAR header `[offset ... offset + 512]`.
@param {number} offset - TAR header offset.
@returns {boolean} `true` if the TAR checksum is valid, otherwise `false`.
*/
export function tarHeaderChecksumMatches(arrayBuffer, offset = 0) {
const readSum = Number.parseInt(new StringType(6).get(arrayBuffer, 148).replace(/\0.*$/, '').trim(), 8); // Read sum in header
if (Number.isNaN(readSum)) {
return false;
}
let sum = 8 * 0x20; // Initialize signed bit sum
for (let index = offset; index < offset + 148; index++) {
sum += arrayBuffer[index];
}
for (let index = offset + 156; index < offset + 512; index++) {
sum += arrayBuffer[index];
}
return readSum === sum;
}
/**
ID3 UINT32 sync-safe tokenizer token.
28 bits (representing up to 256MB) integer, the msb is 0 to avoid "false syncsignals".
*/
export const uint32SyncSafeToken = {
get: (buffer, offset) => (buffer[offset + 3] & 0x7F) | ((buffer[offset + 2]) << 7) | ((buffer[offset + 1]) << 14) | ((buffer[offset]) << 21),
len: 4,
};