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The MIT License (MIT)
Copyright © 2025 Borewit
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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[![CI](https://github.com/Borewit/text-codec/actions/workflows/ci.yml/badge.svg)](https://github.com/Borewit/text-codec/actions/workflows/ci.yml)
[![npm version](https://img.shields.io/npm/v/%40borewit%2Ftext-codec.svg)](https://www.npmjs.com/package/@borewit/text-codec)
[![npm downloads](http://img.shields.io/npm/dm/@borewit/text-codec.svg)](https://npmcharts.com/compare/@borewit/text-codec?interval=30)
![bundlejs](https://deno.bundlejs.com/?q=@borewit/text-codec&badge)
[![License: MIT](https://img.shields.io/badge/License-MIT-green.svg?logo=open-source-initiative&logoColor=white)](LICENSE.txt)
# `@borewit/text-codec`
A **lightweight polyfill for text encoders and decoders** covering a small set of commonly used encodings.
Some JavaScript runtimes provide limited or inconsistent encoding support through `TextEncoder` and `TextDecoder`.
Examples include environments like **Hermes (React Native)** or certain **Node.js builds with limited ICU support**.
This module provides **reliable encode/decode support for a small set of encodings that may be missing or unreliable in those environments**.
- If a native UTF-8 `TextEncoder` / `TextDecoder` is available, it is used.
- All other encodings are implemented by this library.
## Supported encodings
- `utf-8` / `utf8`
- `utf-16le`
- `ascii`
- `latin1` / `iso-8859-1`
- `windows-1252`
These encodings are commonly encountered in metadata formats and legacy text data.
## ✨ Features
- Encoding and decoding utilities
- Lightweight
- Typed API
## 📦 Installation
```sh
npm install @borewit/text-codec
```
# 📚 API Documentation
## `textDecode(bytes, encoding): string`
Decodes binary data into a JavaScript string.
**Parameters**
- `bytes` (`Uint8Array`) — The binary data to decode.
- `encoding` (`SupportedEncoding`, optional) — Encoding type. Defaults to `"utf-8"`.
**Returns**
- `string` — The decoded text.
**Example**
```js
import { textDecode } from "@borewit/text-codec";
const bytes = new Uint8Array([0x48, 0x65, 0x6c, 0x6c, 0x6f]);
const text = textDecode(bytes, "ascii");
console.log(text); // "Hello"
```
## `textEncode(input, encoding): Uint8Array`
Encodes a JavaScript string into binary form using the specified encoding.
**Parameters**
- `input` (`string`) — The string to encode.
- `encoding` (`SupportedEncoding`, optional) — Encoding type. Defaults to `"utf-8"`.
**Returns**
`Uint8Array` — The encoded binary data.
Example:
```js
import { textEncode } from "@borewit/text-codec";
const bytes = textEncode("Hello", "utf-16le");
console.log(bytes); // Uint8Array([...])
```
## 📜 Licence
This project is licensed under the [MIT License](LICENSE.txt). Feel free to use, modify, and distribute as needed.

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export type SupportedEncoding = "utf-8" | "utf8" | "utf-16le" | "us-ascii" | "ascii" | "latin1" | "iso-8859-1" | "windows-1252";
/**
* Decode text from binary data
*/
export declare function textDecode(bytes: Uint8Array, encoding?: SupportedEncoding): string;
export declare function textEncode(input?: string, encoding?: SupportedEncoding): Uint8Array;

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const WINDOWS_1252_EXTRA = {
0x80: "€", 0x82: "‚", 0x83: "ƒ", 0x84: "„", 0x85: "…", 0x86: "†",
0x87: "‡", 0x88: "ˆ", 0x89: "‰", 0x8a: "Š", 0x8b: "‹", 0x8c: "Œ",
0x8e: "Ž", 0x91: "‘", 0x92: "’", 0x93: "“", 0x94: "”", 0x95: "•",
0x96: "–", 0x97: "—", 0x98: "˜", 0x99: "™", 0x9a: "š", 0x9b: "›",
0x9c: "œ", 0x9e: "ž", 0x9f: "Ÿ",
};
const WINDOWS_1252_REVERSE = {};
for (const [code, char] of Object.entries(WINDOWS_1252_EXTRA)) {
WINDOWS_1252_REVERSE[char] = Number.parseInt(code, 10);
}
let _utf8Decoder;
let _utf8Encoder;
function utf8Decoder() {
if (typeof globalThis.TextDecoder === "undefined")
return undefined;
return (_utf8Decoder !== null && _utf8Decoder !== void 0 ? _utf8Decoder : (_utf8Decoder = new globalThis.TextDecoder("utf-8")));
}
function utf8Encoder() {
if (typeof globalThis.TextEncoder === "undefined")
return undefined;
return (_utf8Encoder !== null && _utf8Encoder !== void 0 ? _utf8Encoder : (_utf8Encoder = new globalThis.TextEncoder()));
}
const CHUNK = 32 * 1024;
const REPLACEMENT = 0xfffd;
/**
* Decode text from binary data
*/
export function textDecode(bytes, encoding = "utf-8") {
switch (encoding.toLowerCase()) {
case "utf-8":
case "utf8": {
const dec = utf8Decoder();
return dec ? dec.decode(bytes) : decodeUTF8(bytes);
}
case "utf-16le":
return decodeUTF16LE(bytes);
case "us-ascii":
case "ascii":
return decodeASCII(bytes);
case "latin1":
case "iso-8859-1":
return decodeLatin1(bytes);
case "windows-1252":
return decodeWindows1252(bytes);
default:
throw new RangeError(`Encoding '${encoding}' not supported`);
}
}
export function textEncode(input = "", encoding = "utf-8") {
switch (encoding.toLowerCase()) {
case "utf-8":
case "utf8": {
const enc = utf8Encoder();
return enc ? enc.encode(input) : encodeUTF8(input);
}
case "utf-16le":
return encodeUTF16LE(input);
case "us-ascii":
case "ascii":
return encodeASCII(input);
case "latin1":
case "iso-8859-1":
return encodeLatin1(input);
case "windows-1252":
return encodeWindows1252(input);
default:
throw new RangeError(`Encoding '${encoding}' not supported`);
}
}
function appendCodePoint(out, cp) {
if (cp <= 0xffff) {
out.push(String.fromCharCode(cp));
return;
}
cp -= 0x10000;
out.push(String.fromCharCode(0xd800 + (cp >> 10), 0xdc00 + (cp & 0x3ff)));
}
function flushChunk(parts, chunk) {
if (chunk.length === 0)
return;
parts.push(String.fromCharCode.apply(null, chunk));
chunk.length = 0;
}
function pushCodeUnit(parts, chunk, codeUnit) {
chunk.push(codeUnit);
if (chunk.length >= CHUNK)
flushChunk(parts, chunk);
}
function pushCodePoint(parts, chunk, cp) {
if (cp <= 0xffff) {
pushCodeUnit(parts, chunk, cp);
return;
}
cp -= 0x10000;
pushCodeUnit(parts, chunk, 0xd800 + (cp >> 10));
pushCodeUnit(parts, chunk, 0xdc00 + (cp & 0x3ff));
}
function decodeUTF8(bytes) {
const parts = [];
const chunk = [];
let i = 0;
// Match TextDecoder("utf-8") default BOM handling
if (bytes.length >= 3 &&
bytes[0] === 0xef &&
bytes[1] === 0xbb &&
bytes[2] === 0xbf) {
i = 3;
}
while (i < bytes.length) {
const b1 = bytes[i];
if (b1 <= 0x7f) {
pushCodeUnit(parts, chunk, b1);
i++;
continue;
}
// Invalid leading bytes: continuation byte or impossible prefixes
if (b1 < 0xc2 || b1 > 0xf4) {
pushCodeUnit(parts, chunk, REPLACEMENT);
i++;
continue;
}
// 2-byte sequence
if (b1 <= 0xdf) {
if (i + 1 >= bytes.length) {
pushCodeUnit(parts, chunk, REPLACEMENT);
i++;
continue;
}
const b2 = bytes[i + 1];
if ((b2 & 0xc0) !== 0x80) {
pushCodeUnit(parts, chunk, REPLACEMENT);
i++;
continue;
}
const cp = ((b1 & 0x1f) << 6) | (b2 & 0x3f);
pushCodeUnit(parts, chunk, cp);
i += 2;
continue;
}
// 3-byte sequence
if (b1 <= 0xef) {
if (i + 2 >= bytes.length) {
pushCodeUnit(parts, chunk, REPLACEMENT);
i++;
continue;
}
const b2 = bytes[i + 1];
const b3 = bytes[i + 2];
const valid = (b2 & 0xc0) === 0x80 &&
(b3 & 0xc0) === 0x80 &&
!(b1 === 0xe0 && b2 < 0xa0) && // overlong
!(b1 === 0xed && b2 >= 0xa0); // surrogate range
if (!valid) {
pushCodeUnit(parts, chunk, REPLACEMENT);
i++;
continue;
}
const cp = ((b1 & 0x0f) << 12) |
((b2 & 0x3f) << 6) |
(b3 & 0x3f);
pushCodeUnit(parts, chunk, cp);
i += 3;
continue;
}
// 4-byte sequence
if (i + 3 >= bytes.length) {
pushCodeUnit(parts, chunk, REPLACEMENT);
i++;
continue;
}
const b2 = bytes[i + 1];
const b3 = bytes[i + 2];
const b4 = bytes[i + 3];
const valid = (b2 & 0xc0) === 0x80 &&
(b3 & 0xc0) === 0x80 &&
(b4 & 0xc0) === 0x80 &&
!(b1 === 0xf0 && b2 < 0x90) && // overlong
!(b1 === 0xf4 && b2 > 0x8f); // > U+10FFFF
if (!valid) {
pushCodeUnit(parts, chunk, REPLACEMENT);
i++;
continue;
}
const cp = ((b1 & 0x07) << 18) |
((b2 & 0x3f) << 12) |
((b3 & 0x3f) << 6) |
(b4 & 0x3f);
pushCodePoint(parts, chunk, cp);
i += 4;
}
flushChunk(parts, chunk);
return parts.join("");
}
function decodeUTF16LE(bytes) {
const parts = [];
const chunk = [];
const len = bytes.length;
let i = 0;
while (i + 1 < len) {
const u1 = bytes[i] | (bytes[i + 1] << 8);
i += 2;
// High surrogate
if (u1 >= 0xd800 && u1 <= 0xdbff) {
if (i + 1 < len) {
const u2 = bytes[i] | (bytes[i + 1] << 8);
if (u2 >= 0xdc00 && u2 <= 0xdfff) {
pushCodeUnit(parts, chunk, u1);
pushCodeUnit(parts, chunk, u2);
i += 2;
}
else {
pushCodeUnit(parts, chunk, REPLACEMENT);
}
}
else {
pushCodeUnit(parts, chunk, REPLACEMENT);
}
continue;
}
// Lone low surrogate
if (u1 >= 0xdc00 && u1 <= 0xdfff) {
pushCodeUnit(parts, chunk, REPLACEMENT);
continue;
}
pushCodeUnit(parts, chunk, u1);
}
// Odd trailing byte
if (i < len) {
pushCodeUnit(parts, chunk, REPLACEMENT);
}
flushChunk(parts, chunk);
return parts.join("");
}
function decodeASCII(bytes) {
const parts = [];
for (let i = 0; i < bytes.length; i += CHUNK) {
const end = Math.min(bytes.length, i + CHUNK);
const codes = new Array(end - i);
for (let j = i, k = 0; j < end; j++, k++) {
codes[k] = bytes[j] & 0x7f;
}
parts.push(String.fromCharCode.apply(null, codes));
}
return parts.join("");
}
function decodeLatin1(bytes) {
const parts = [];
for (let i = 0; i < bytes.length; i += CHUNK) {
const end = Math.min(bytes.length, i + CHUNK);
const codes = new Array(end - i);
for (let j = i, k = 0; j < end; j++, k++) {
codes[k] = bytes[j];
}
parts.push(String.fromCharCode.apply(null, codes));
}
return parts.join("");
}
function decodeWindows1252(bytes) {
const parts = [];
let out = "";
for (let i = 0; i < bytes.length; i++) {
const b = bytes[i];
const extra = b >= 0x80 && b <= 0x9f ? WINDOWS_1252_EXTRA[b] : undefined;
out += extra !== null && extra !== void 0 ? extra : String.fromCharCode(b);
if (out.length >= CHUNK) {
parts.push(out);
out = "";
}
}
if (out)
parts.push(out);
return parts.join("");
}
function encodeUTF8(str) {
const out = [];
for (let i = 0; i < str.length; i++) {
let cp = str.charCodeAt(i);
// Valid surrogate pair
if (cp >= 0xd800 && cp <= 0xdbff) {
if (i + 1 < str.length) {
const lo = str.charCodeAt(i + 1);
if (lo >= 0xdc00 && lo <= 0xdfff) {
cp = 0x10000 + ((cp - 0xd800) << 10) + (lo - 0xdc00);
i++;
}
else {
cp = REPLACEMENT;
}
}
else {
cp = REPLACEMENT;
}
}
else if (cp >= 0xdc00 && cp <= 0xdfff) {
// Lone low surrogate
cp = REPLACEMENT;
}
if (cp < 0x80) {
out.push(cp);
}
else if (cp < 0x800) {
out.push(0xc0 | (cp >> 6), 0x80 | (cp & 0x3f));
}
else if (cp < 0x10000) {
out.push(0xe0 | (cp >> 12), 0x80 | ((cp >> 6) & 0x3f), 0x80 | (cp & 0x3f));
}
else {
out.push(0xf0 | (cp >> 18), 0x80 | ((cp >> 12) & 0x3f), 0x80 | ((cp >> 6) & 0x3f), 0x80 | (cp & 0x3f));
}
}
return new Uint8Array(out);
}
function encodeUTF16LE(str) {
// Preserve JS string code units, but do not emit non-well-formed UTF-16.
// Replace lone surrogates with U+FFFD.
const units = [];
for (let i = 0; i < str.length; i++) {
const u = str.charCodeAt(i);
if (u >= 0xd800 && u <= 0xdbff) {
if (i + 1 < str.length) {
const lo = str.charCodeAt(i + 1);
if (lo >= 0xdc00 && lo <= 0xdfff) {
units.push(u, lo);
i++;
}
else {
units.push(REPLACEMENT);
}
}
else {
units.push(REPLACEMENT);
}
continue;
}
if (u >= 0xdc00 && u <= 0xdfff) {
units.push(REPLACEMENT);
continue;
}
units.push(u);
}
const out = new Uint8Array(units.length * 2);
for (let i = 0; i < units.length; i++) {
const code = units[i];
const o = i * 2;
out[o] = code & 0xff;
out[o + 1] = code >>> 8;
}
return out;
}
function encodeASCII(str) {
const out = new Uint8Array(str.length);
for (let i = 0; i < str.length; i++)
out[i] = str.charCodeAt(i) & 0x7f;
return out;
}
function encodeLatin1(str) {
const out = new Uint8Array(str.length);
for (let i = 0; i < str.length; i++)
out[i] = str.charCodeAt(i) & 0xff;
return out;
}
function encodeWindows1252(str) {
const out = new Uint8Array(str.length);
for (let i = 0; i < str.length; i++) {
const ch = str[i];
const code = ch.charCodeAt(0);
if (WINDOWS_1252_REVERSE[ch] !== undefined) {
out[i] = WINDOWS_1252_REVERSE[ch];
continue;
}
if ((code >= 0x00 && code <= 0x7f) ||
(code >= 0xa0 && code <= 0xff)) {
out[i] = code;
continue;
}
out[i] = 0x3f; // '?'
}
return out;
}

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{
"name": "@borewit/text-codec",
"version": "0.2.2",
"description": "Text Decoder",
"type": "module",
"exports": "./lib/index.js",
"types": "lib/index.d.ts",
"files": [
"lib/index.js",
"lib/index.d.ts"
],
"scripts": {
"clean": "del-cli lib/**/*.js lib/***.js.map test/**/*.d.ts test/**/*.js test/**/*.js.map",
"build": "npm run compile",
"prepublishOnly": "npm run build",
"compile:src": "tsc --p lib --sourceMap false",
"compile:test": "tsc --p test",
"compile": "npm run compile:src && npm run compile:test",
"lint": "biome check",
"test": "mocha",
"update-biome": "npm install --save-dev --save-exact @biomejs/biome@latest && npx @biomejs/biome migrate --write"
},
"devDependencies": {
"@biomejs/biome": "2.4.6",
"@types/chai": "^5.2.2",
"@types/mocha": "^10.0.10",
"chai": "^6.2.2",
"mocha": "^11.7.5",
"ts-node": "^10.9.2",
"typescript": "^5.9.3"
},
"keywords": [
"TextDecoder",
"TextEncoder",
"decoder",
"decoding",
"encod",
"encoding",
"decode",
"text",
"ascii",
"utf-8",
"utf8",
"utf-16le",
"latin1",
"iso-8859-1",
"windows-1252",
"charset",
"encoding",
"decoding",
"polyfill",
"character-set",
"latin",
"hermes",
"react"
],
"repository": {
"type": "git",
"url": "git+https://github.com/Borewit/text-codec.git"
},
"author": {
"name": "Borewit",
"url": "https://github.com/Borewit"
},
"funding": {
"type": "github",
"url": "https://github.com/sponsors/Borewit"
},
"license": "MIT"
}