JWT Token Generator
Generate HMAC SHA256 JSON Web Tokens entirely in your browser.
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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
- Enter your JWT Header JSON.
- Input your Payload JSON (claims, expiry).
- Enter your HMAC secret signing key.
- Click Generate JWT.
Worked Example
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.
Is my secret key safe?
Absolutely. Everything is generated client-side using the native Web Crypto API. We never see your secret key.
Do you support RS256?
Currently, our client-side generator only supports symmetric HS256 signatures.