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    4.2.12 • Public • Published

    UUID.js - RFC-compliant UUID Generator for JavaScript

    npm License


    <!-- HTML5 -->
    <script src="src/uuid.js"></script>
    <script> var uuid = UUID.generate(); </script>
    // Node.js
    let UUID = require("uuidjs");
    let uuid = UUID.generate();
    // TypeScript
    import UUID from "uuidjs";
    let str: string = UUID.generate();
    let obj: UUID = UUID.genV4();
    # Command-line
    npx uuidjs


    UUID.js is a JavaScript/ECMAScript library to generate RFC 4122 compliant Universally Unique IDentifiers (UUIDs). This library supports both version 4 UUIDs (UUIDs from random numbers) and version 1 UUIDs (time-based UUIDs), and provides an object-oriented interface to print a generated or parsed UUID in a variety of forms.


    • Generates version 4 UUIDs (UUIDs from random numbers) and version 1 UUIDs (time-based UUIDs)
    • Provides an object-oriented interface to print various string representations of a generated or parsed UUID
    • Utilizes a cryptographically secure pseudo-random number generator if available, whereas falling back to Math.random() otherwise
    • Appends extra random bits to compensate for the lower timestamp resolution of JavaScript than that required for version 1 UUIDs
    • Comes with a lot of test cases including format checks and statistical tests to maintain a high-quality code base
    • Supports old browsers as well as modern browser and server environments, as kept compatible with ECMAScript 3rd edition


    Download src/uuid.js or call npm install uuidjs.

    Then, load src/uuid.js.

    <script src="src/uuid.js"></script>

    Or, import uuidjs.

    const UUID = require("uuidjs");

    Usage Examples

    UUID.generate() returns a version 4 UUID as a hexadecimal string.

    // Create a version 4 UUID as a hexadecimal string
    console.log(UUID.generate());   // fa84cf42-ffdf-4975-b42b-31ab5fb983eb

    UUID.genV4(), UUID.genV1(), and UUID.parse() return a UUID object that has various fields and methods.

    // Create a version 4 (random number-based) UUID object
    var objV4 = UUID.genV4();
    // Create a version 1 (time-based) UUID object
    var objV1 = UUID.genV1();
    // Create a UUID object from a hexadecimal string
    var uuid = UUID.parse("a0e0f130-8c21-11df-92d9-95795a3bcd40");
    // Get string representations of a UUID object
    console.log(uuid.toString());   // "a0e0f130-8c21-11df-92d9-95795a3bcd40"
    console.log(uuid.hexString);    // "a0e0f130-8c21-11df-92d9-95795a3bcd40"
    console.log(uuid.hexNoDelim);   // "a0e0f1308c2111df92d995795a3bcd40"
    console.log(uuid.bitString);    // "101000001110000 ... 1100110101000000"
    console.log(uuid.urn);          // "urn:uuid:a0e0f130-8c21-11df-92d9-95795a3bcd40"
    // Compare UUID objects
    console.log(objV4.equals(objV1));   // false
    // Get UUID version numbers
    console.log(objV4.version); // 4
    console.log(objV1.version); // 1
    // Get internal field values in 3 different forms via 2 different accessors
    console.log(uuid.intFields.timeLow);                // 2699096368
    console.log(uuid.bitFields.timeMid);                // "1000110000100001"
    console.log(uuid.hexFields.timeHiAndVersion);       // "11df"
    console.log(uuid.intFields.clockSeqHiAndReserved);  // 146
    console.log(uuid.bitFields.clockSeqLow);            // "11011001"
    console.log(uuid.hexFields.node);                   // "95795a3bcd40"
    console.log(uuid.intFields[0]);                     // 2699096368
    console.log(uuid.bitFields[1]);                     // "1000110000100001"
    console.log(uuid.hexFields[2]);                     // "11df"
    console.log(uuid.intFields[3]);                     // 146
    console.log(uuid.bitFields[4]);                     // "11011001"
    console.log(uuid.hexFields[5]);                     // "95795a3bcd40"

    UUID.js supports the so-called noConflict mode to work around namespace conflicts.

    // Avoid namespace conflicts with other libraries
    var arbitraryVarName = UUID;
    UUID = UUID.overwrittenUUID;                // Restore the original value
    console.log(arbitraryVarName.generate());   // "cb9a0283-a44c-4e7a-a5b0-9cd2876e952b"


    Copyright (c) 2010-2022 LiosK

    Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

    Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.



    See Also


    npm i uuidjs

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