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    Generate and translate standard UUIDs into shorter - or just different - formats and back.


    Major Changes in 4.0.0

    • 🛑 short-uuid will now throw an error when provided an alphabet with duplicate characters. Duplicate characters will cause translation errors.
    • ℹ️ 4.0.0 is written in modern ECMAScript. It uses features through ES9/ES2018.
    • ℹ️ By default, short-uuid will pad shortened IDs to a consistent length.
      • Padding does not affect translation, and the values are compatible with previous releases.
      • Padding can be disabled with the option consistentLength: false when instantiating a translator. This is consistent with previous versions.
    • ℹ️ 4.x does not include a pre-built version for browsers. If needed, 3.1.1 is compatible, but does not pad to a consistent length.

    Quick Start

    const short = require('short-uuid');
    // Quick start with flickrBase58 format
    short.generate(); // 73WakrfVbNJBaAmhQtEeDv


    short-uuid starts with RFC4122 v4-compliant UUIDs and translates them into other, usually shorter formats. It also provides translators to convert back and forth from RFC compliant UUIDs to the shorter formats.

    As of 4.0.0, formats return consistent-length values unless specifically requested. This is done by padding the start with the first ([0]) character in the alphabet. Previous versions can translate padded formats back to UUID.

    const short = require('short-uuid');
    const translator = short(); // Defaults to flickrBase58
    const decimalTranslator = short("0123456789"); // Provide a specific alphabet for translation
    const cookieTranslator = short(short.constants.cookieBase90); // Use a constant for translation
    // Generate a shortened v4 UUID; // mhvXdrZT4jP5T8vBxuvm75
    translator.generate(); // An alias for new.
    // Translate UUIDs to and from the shortened format
    translator.toUUID(shortId); // a44521d0-0fb8-4ade-8002-3385545c3318
    translator.fromUUID(regularUUID); // mhvXdrZT4jP5T8vBxuvm75
    // Generate plain UUIDs
    // - From the library without creating a translator
    short.uuid(); // fd5c084c-ff7c-4651-9a52-37096242d81c
    // - Each translator provides the uuid.v4() function, too
    translator.uuid(); // 3023b0f5-ec55-4e75-9cd8-104700698052
    // See the alphabet used by a translator
    // The maximum length a translated uuid will be with its alphabet.
    // View the constants
    short.constants.flickrBase58; // Avoids similar characters (0/O, 1/I/l, etc.)
    short.constants.cookieBase90; // Safe for HTTP cookies values for smaller IDs.


    short-uuid 4.0.0 adds support for options when creating a translator. This will support additional configuration in the future.

    const short = require('short-uuid');
    // By default shortened values are now padded for consistent length.
    // If you want to produce variable lengths, like in 3.1.1
    const translator = short(short.constants.flickrBase58, {
      consistentLength: false,
    // Generate a shortened v4 UUID; // mhvXdrZT4jP5T8vBxuvm75
    • consistentLength - Controls padding on shortened values. Default is true.


    short-uuid 4.0.0 and later is confirmed to work on Node 8.x and later.

    • Pre-compiled browser version is planned for future release.

    short-uuid 3.1.1 and lower is confirmed to work on Node 0.10.x and later, and browsers with a precompiled library proposed by voronianski.


    short-uuid provides RFC4122 v4-compliant UUIDs, thanks to uuid.

    TypeScript definitions are included, thanks to alexturek.

    Recent Release Notes

    4.1.0 adds a maxLength value to translators for reference 4.0.3 fixes default generate 4.0.1 adds consistent length translation and throws an error if provided an invalid alphabet. 3.1.1 updated dev dependencies which required dropping Node 4.x build test. Last Browserify distribution version temporarily. 2.3.4 corrects the behavior for UUIDs with uppercase letters. Last version to build on Node 0.x.

    Please see Revisions for information on previous versions.


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