JavaScript

UUID Generation

Generate a unique identifier compliant with UUID v4.

By EZ4Code TeamLast updated: 2026-08-01

uuidunique-id

Code

function uuid() {
  if (crypto.randomUUID) return crypto.randomUUID();
  return "xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx".replace(/[xy]/g, c => {
    const r = (Math.random() * 16) | 0;
    const v = c === "x" ? r : (r & 0x3) | 0x8;
    return v.toString(16);
  });
}

Explanation

Prefers native crypto.randomUUID, with a fallback using Math.random.

More JavaScript Snippets

Array Map Filter Reduce

Chain map, filter, reduce, find, some, and every on arrays.

Array Deduplication

Deduplicate an array using Set.

Deep Clone

Deep clone objects, supporting common data types.

Debounce Function

Wait a period of time after an event triggers before executing; reset the timer if triggered again during the wait.

Throttle Function

Limit a function to execute at most once within a time interval.

Promise.all Concurrency Control

A Promise executor with concurrency limit.