UUID v4 Generator for Developers

Universally Unique Identifiers (UUIDs) are a foundational building block in modern systems. This UUID v4 Generator is built specifically for developers, programmers, and system administrators who need fast, reliable, and RFC-compliant UUID generation.

Use the instant UUID v4 generator at
👉 https://langstop.com/uuid-generator/v4
to generate single or bulk UUIDs with zero setup.

What Is a UUID v4?

UUID v4 is a randomly generated 128-bit identifier defined by RFC 4122.
It does not rely on timestamps, MAC addresses, or centralized coordination.

Why v4 specifically?

• Cryptographically strong randomness
• No collision coordination
• Safe for distributed systems
• Language and platform agnostic

Why Developers Prefer UUID v4

UUID v4 is the default choice for modern backend and frontend architectures.

Key reasons:

• Stateless generation
• Works offline
• No database round trips
• Perfect for microservices, queues, and APIs

This makes UUID v4 ideal for:

• Database primary keys
• Public-facing IDs
• Session identifiers
• Event tracking

Instant UUID v4 Generator (Online Tool)

The UUID v4 Generator at
👉 https://langstop.com/uuid-generator/v4
allows you to generate UUIDs instantly without installing any dependencies.

Features

• One-click UUID v4 generation
• Copy-ready output
• RFC 4122 compliant
• Works in all modern browsers

Bulk UUID v4 Generator for High-Scale Use

Need thousands of UUIDs at once?

The Bulk UUID Generator supports:

• Generating hundreds or thousands of UUID v4 values
• Copying results in a single action
• Fast client-side generation
• No API limits

Perfect for:

• Database seeding
• Load testing
• Mock data generation
• Distributed job initialization

How UUID v4 Works (Step by Step)

1. Generate 128 bits of random data
2. Set version bits to 0100 (v4)
3. Set variant bits to RFC 4122 format
4. Format as 8-4-4-4-12 hexadecimal string

Example:

550e8400-e29b-41d4-a716-446655440000

UUID v4 Code Examples (Copy & Paste)

JavaScript (Browser / Node.js)

crypto.randomUUID();

JavaScript (Manual v4 Generation)

function uuidV4() {
  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);
  });
}

Python

import uuid
uuid.uuid4()

Java

UUID.randomUUID().toString();

UUID v4 in Modern Web Apps (Next.js Example)

Using UUID v4 in a Next.js + Zustand app:

import { v4 as uuidv4 } from "uuid";
 
const id = uuidv4();

Use cases:

• Client-side temporary IDs
• Optimistic UI updates
• Form field keys
• List rendering

UUID v4 vs Other UUID Versions

Recommendation: Use UUID v4 unless determinism is required.

Security and Collision Considerations

UUID v4 offers:

• 122 bits of randomness
• ~5.3 × 10³⁶ possible values
• Practically zero collision risk

It is safe for:

• Public exposure
• URLs
• Client-side generation

FAQs: UUID v4 Generator

Is UUID v4 safe for databases?

Yes. It is widely used in PostgreSQL, MySQL, MongoDB, and distributed systems.

Can UUID v4 be generated on the client?

Yes. Modern browsers support crypto.randomUUID().

Is UUID v4 SEO-safe in URLs?

Yes. UUIDs are URL-safe and collision-resistant.

How many UUIDs can I generate?

Using the bulk tool at
👉 https://langstop.com/uuid-generator/v4
you can generate large batches instantly.

When to Use an Online UUID v4 Generator

Use an online generator when:

• You need UUIDs quickly
• You don’t want dependencies
• You’re seeding data manually
• You’re testing APIs or schemas

The UUID v4 generator at
👉 https://langstop.com/uuid-generator/v4
is optimized for speed and developer workflows.

Final Thoughts

UUID v4 remains the most reliable, scalable, and developer-friendly identifier format for modern systems.

Whether you need a single UUID or bulk UUID generation, this tool is built to support real-world engineering workflows with zero friction.