JWT Generator & Signer
Generate and sign JSON Web Tokens (JWT) with HMAC-SHA256. All processing happens client-side.
Examples of use
- Generate JWT tokens for API authentication testing
- Create signed tokens with custom claims for development
- Test JWT validation logic in your applications
When to use this tool?
- When generating test JWT tokens for API development
- When testing JWT validation logic in your applications
- When creating tokens with custom claims for development
Frequently asked questions
- How does JWT signing work?
- The tool uses HMAC-SHA256 to create a cryptographic signature of the header and payload using your secret key. The signature ensures the token hasn't been tampered with.
- Is the secret key sent to a server?
- No. All processing happens entirely in your browser using the Web Crypto API via the jose library. The secret never leaves your device.
- What algorithms are supported?
- Currently HMAC-SHA256 (HS256) is supported. The header can specify any algorithm, but the signing always uses HS256.