JWT Validator Online
Validate JSON Web Tokens (JWT), check signatures, expiration, and other claims. This tool works entirely in your browser for privacy and security.
How to Use the JWT Validator
- Paste your JWT into the input editor
- Optionally provide a secret key for signature validation
- Click the "Validate" button
- View the validation results and decoded header/payload
- Copy results using the copy buttons
Note: This tool performs basic JWT validation including structure checks, expiration validation, and not-before checks. Signature validation is simulated for demonstration purposes. For production use, always validate tokens securely in your backend with proper cryptographic libraries.