developer
Client-Side Only
Free Forever

JWT Token Generator

Generate HMAC SHA256 JSON Web Tokens entirely in your browser.

Header (JSON)
Loading premium editor...
Payload (JSON)
Loading premium editor...
Generated Token
JWT
Click generate to create your token

Advertisement

Share this tool:

How to use the JWT Generator

Enter your JSON header, payload, and secret key, then click 'Generate JWT'.

?Frequently Asked Questions

What is the JWT Token Generator?

The JWT Generator creates signed JSON Web Tokens using HS256 (HMAC-SHA256) entirely inside your browser via the native Web Crypto API — your secret key never leaves your device.

Who is the JWT Token Generator for?

Designed for backend developers and API engineers testing JWT-secured authentication endpoints.

How to Use the JWT Token Generator

  1. Enter your JWT Header JSON.
  2. Input your Payload JSON (claims, expiry).
  3. Enter your HMAC secret signing key.
  4. Click Generate JWT.

Worked Calculation Example

Generating a JWT with payload '{"sub":"user123","exp":1700000000}' and secret 'myKey' produces a signed three-part dot-separated token string.

Frequently Asked Questions

Is my secret key secure?

Yes. JWT signing uses Web Crypto API locally in your browser. Your secret key is never transmitted or logged.

Do you support RS256 signing?

Currently only HS256 (symmetric HMAC) is supported. Asymmetric RSA signing requires a server-side private key.

Explore Related Utilities & Guides

Related Tools

All Developer Tools

JWT Decoder

Decode JSON Web Tokens securely without sending them to a server.

Base64 Encoder / Decoder

Encode or decode strings to Base64 safely and quickly.

Educational Guides

All Guides

How to Properly Format JSON Payloads for REST APIs

Learn the standard practices for organizing and nesting JSON structures for optimal API transmission and parsing performance.

Understanding Base64 Encoding: A Complete Guide

A deep dive into how binary data is translated into 64 ASCII characters for safe web transport and storage.