JWT Generator
Generate and decode JSON Web Tokens
JWT Generator & Decoder
Usage Examples
Basic User Token
A simple JWT with user identity claims. Perfect for learning JWT structure and basic authentication tokens.
API Auth Token
A complete API authentication token with issuer, audience, expiry, roles and all standard registered claims.
Service-to-Service Token
A short-lived HS512 token for secure service-to-service communication with strict time constraints.
Features
Multiple Algorithms
Support for HS256, HS384 and HS512 HMAC signing algorithms using Web Crypto API
Decode & Verify
Decode any JWT token to inspect header and payload, with optional signature verification
Color-Coded Output
JWT output with color-coded header, payload and signature parts for easy identification
Privacy First
All processing happens locally in your browser using Web Crypto API, no data sent to servers
How to Use?
Set Up Claims
Choose your algorithm, edit the payload JSON with your claims, and enter a secret key.
Generate Token
Click Generate JWT to create a signed token. The output shows color-coded header, payload and signature.
Decode & Verify
Switch to Decode tab to inspect any JWT token. Provide a secret key to verify the signature.
Frequently Asked Questions
What Is JWT Generator?
A browser-based tool for creating and decoding JSON Web Tokens. Pick an algorithm, set your claims, enter a secret, and get a signed JWT with color-coded header, payload, and signature sections.
Generate & Decode
The Generate tab lets you build tokens with custom claims and expiry. The Decode tab inspects any JWT, checks expiration, and optionally verifies the signature if you provide the secret.
Who Needs This?
Backend devs testing auth flows, frontend devs inspecting tokens from an API, students learning how JWTs work -- anyone who touches token-based authentication during development.
Tips
Use the Quick Claims buttons to insert standard fields like iss, sub, and aud. Set an expiry so your test tokens behave realistically. The color-coded output makes it easy to spot each JWT section.
Privacy & Security
Signing uses the browser Web Crypto API with no server round-trips. Your secrets and tokens never leave your machine. Still, avoid pasting real production secrets in any browser tool.