JWT Generator
Generate JWT tokens with custom payloads and secrets.
JWT Configuration
Configure payload and signing options
Generated Token
The encoded JSON Web Token
About JWT Generator
The JWT Generator allows you to forge custom JSON Web Tokens (JWT) for testing your APIs and authentication middleware. You can customize the header, payload claims, and sign it using various algorithms like HS256 and RS256.
How to Use
Real-World Examples
Forging an Admin Token
Generate a token with elevated privileges to test if your backend correctly implements Role-Based Access Control (RBAC).
{
"sub": "user_123",
"role": "admin"
}eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiJ1c2VyXzEyMyIsInJvbGUiOiJhZG1pbiJ9.HMAC_SIGNATURE_HERE
Best Practices
- Use strong, randomly generated secrets (at least 32 characters) for signing production tokens.
- Always include an `exp` (expiration) claim to ensure tokens are short-lived.
Pro Tips
You can quickly test edge cases by manually setting an expired `exp` timestamp to see how your backend reacts.
Frequently Asked Questions
Which signing algorithms are supported?
We support symmetric algorithms like HS256, HS384, HS512, and asymmetric algorithms like RS256.
Is my data secure?
Absolutely. All processing is done locally in your browser. Your data is never sent to our servers.
Security & Privacy
The token signing occurs strictly client-side using native Web Crypto APIs. Your private signing keys and token payloads are never transmitted.