JWT Token Generator
Generate a Signed JSON Web Token Instantly
Need to use JWT Token Generator right now?
Useful for testing an API endpoint that requires a JWT, without spinning up a backend just to mint one.
Signing happens locally using the Web Crypto API — your secret never leaves your browser.
Features
- Runs entirely in your browser
- Privacy-first — your data is never uploaded
- Real-time, instant results
- 100% free, no sign-up required
- Works on desktop, tablet, and mobile
- No installation needed
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About JWT Token Generator
Testing an API that expects a JWT often means you need a quick, correctly signed token without spinning up a whole auth server just to generate one. This tool builds a genuine JSON Web Token: you write the payload, provide a secret, and it produces a properly base64url-encoded, HMAC-SHA256-signed token using the browser's native Web Crypto API — not a fake-looking placeholder string.
The token follows the standard three-part JWT structure (header.payload.signature), with the header fixed to the common HS256/JWT combination and your payload JSON encoded exactly as you write it. Signing uses `crypto.subtle.sign` with HMAC-SHA256, the same cryptographic primitive real JWT libraries use under the hood — the output is a token that any standard JWT verifier will accept as genuinely valid, given the matching secret.
Because everything runs through the Web Crypto API locally, your signing secret is never transmitted anywhere — it's used in-memory for one signing operation and never leaves your browser tab. This makes it safe to use even with a real (non-production) secret while testing.
How it works
- Write your payload JSON. The claims you want encoded in the token.
- Enter your HMAC secret. Used to sign the token with HS256.
- Generate and copy. A genuine, signed three-part JWT.
Examples
Generating a test token
Input
{"sub":"123","name":"Jane"}, secret: "test-secret"Output
A valid HS256-signed JWT string