JWT Generator

Generate signed JSON Web Tokens (JWT) with a custom payload and secret.

How to Use JWT Generator

  1. Enter your custom JSON payload (claims) and a secret key.
  2. Choose the signing algorithm (typically HS256).
  3. Click "Generate" to get a signed JWT string, ready to copy for testing.

Key Features & Practical Use Cases

  • Creating signed test JWTs during local development to simulate an authenticated API request.
  • Generating tokens with custom claims and expiry times to test authorization logic.
  • Prototyping how a JWT payload and signature look before wiring up a real auth server.

Frequently Asked Questions

Is it safe to generate production auth tokens with this tool?

This is intended for local development and testing — for real production authentication, tokens should be signed server-side using a securely stored secret, not generated in a browser tool.

Does my secret key get sent anywhere?

No — signing happens entirely client-side in your browser using the Web Crypto API; your secret and payload never leave your device.

Can I set a custom expiry time?

Yes — include an `exp` claim (Unix timestamp) in your payload JSON to control when the generated token expires.

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