Nifty Penguin Magic

    DefinitelyTyped icon, indicating that this package has TypeScript declarations provided by the separate @types/whatwg-encoding package

    1.0.5 • Public • Published

    Decode According to the WHATWG Encoding Standard

    This package provides a thin layer on top of iconv-lite which makes it expose some of the same primitives as the Encoding Standard.

    const whatwgEncoding = require("whatwg-encoding");
    console.assert(whatwgEncoding.labelToName("latin1") === "windows-1252");
    console.assert(whatwgEncoding.labelToName("  CYRILLic ") === "ISO-8859-5");
    console.assert(whatwgEncoding.isSupported("IBM866") === true);
    // Not supported by the Encoding Standard
    console.assert(whatwgEncoding.isSupported("UTF-32") === false);
    // In the Encoding Standard, but this package can't decode it
    console.assert(whatwgEncoding.isSupported("x-mac-cyrillic") === false);
    console.assert(whatwgEncoding.getBOMEncoding(new Buffer([0xFE, 0xFF])) === "UTF-16BE");
    console.assert(whatwgEncoding.getBOMEncoding(new Buffer([0x48, 0x69])) === null);
    console.assert(whatwgEncoding.decode(new Buffer([0x48, 0x69]), "UTF-8") === "Hi");


    • decode(buffer, fallbackEncodingName): performs the decode algorithm (in which any BOM will override the passed fallback encoding), and returns the resulting string
    • labelToName(label): performs the get an encoding algorithm and returns the resulting encoding's name, or null for failure
    • isSupported(name): returns whether the encoding is one of the encodings of the Encoding Standard, and is an encoding that this package can decode (via iconv-lite)
    • getBOMEncoding(buffer): sniffs the first 2–3 bytes of the supplied Buffer, returning one of the encoding names "UTF-8", "UTF-16LE", or "UTF-16BE" if the appropriate BOM is present, or null if no BOM is present

    Unsupported encodings

    Since we rely on iconv-lite, we are limited to support only the encodings that they support. Currently we are missing support for:

    • ISO-2022-JP
    • ISO-8859-8-I
    • replacement
    • x-mac-cyrillic
    • x-user-defined

    Passing these encoding names will return false when calling isSupported, and passing any of the possible labels for these encodings to labelToName will return null.


    This package was originally based on the excellent work of @nicolashenry, in jsdom. It has since been pulled out into this separate package.


    If you are looking for a JavaScript implementation of the Encoding Standard's TextEncoder and TextDecoder APIs, you'll want @inexorabletash's text-encoding package.


    npm i whatwg-encoding@1.0.5





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