core-uuid/dist/uuid/v4.js

A zero-dependency, secure, and lightweight UUID v4 generator written in TypeScript.

import { getSecureRandomBytes } from "../random/secure-random.js";
/**
 * Generate a RFC 4122 compliant UUID v4
 * @returns UUID v4 string (e.g., "f47ac10b-58cc-4372-a567-0e02b2c3d479")
 */
export function uuidv4() {
    const bytes = getSecureRandomBytes(16);
    // Set version (4) and variant (RFC 4122) bits
    bytes[6] = (bytes[6] & 0x0f) | 0x40;
    bytes[8] = (bytes[8] & 0x3f) | 0x80;
    // Convert to hex string
    const hex = [];
    for (let i = 0; i < 16; i++) {
        hex.push(bytes[i].toString(16).padStart(2, "0"));
    }
    return `${hex[0]}${hex[1]}${hex[2]}${hex[3]}-${hex[4]}${hex[5]}-${hex[6]}${hex[7]}-${hex[8]}${hex[9]}-${hex[10]}${hex[11]}${hex[12]}${hex[13]}${hex[14]}${hex[15]}`;
}
export default uuidv4;