JWT Generator
Generate JSON Web Tokens for testing.
Runs on your machine. Nothing you paste is uploaded.
Get JWT Generator and 121 other tools. Free for 7 days, no account needed.
What it does
Write a JSON header and payload, enter a secret, and get a signed JWT that updates as you type. Tokens are signed with HMAC using HS256, HS384, or HS512, picked from the alg field in your header.
Invalid JSON, a missing secret, or an unsupported algorithm each get a specific error message, so you know what to fix. Signing runs locally through the Web Crypto API and the secret is never saved between sessions. Even so, use a test secret rather than a production one.
When you would reach for it
- Create a token with a custom role or scope to test how your API handles authorization.
- Generate an already-expired token by setting exp in the past to check that your backend rejects it.
- Produce sample tokens for API docs, Postman collections, or integration test fixtures.
- Compare HS256 and HS512 output while setting up JWT verification in a new service.
Also found by searching
- jwt
- token
- generate
- json
- web
- auth
- rs256
- es256
- ps256
- hs256
- jws
- sign