JWT Validator
Validate JWT token structure and check claims.
All processing happens in your browser. Your data never leaves your device.
How to Use
- 1Paste your JWT token.
- 2Click "Validate JWT" to check its structure.
- 3Review validation results and warnings.
What is JWT Validator?
JWT Validator checks the structural validity of JSON Web Tokens, verifies required fields, and reports on expiration status. It validates format, not cryptographic signatures.
Key Features
- Validates JWT structure (3 parts)
- Checks required header fields (alg, typ)
- Reports expiration status
- Warns about missing standard claims
- 100% client-side
JWT Validator vs Other Tools
| Feature | JWT Validator | Other Tools |
|---|---|---|
| Client-side processing | Yes | Varies |
| No signup required | Yes | Often required |
| Privacy-first (no data sent) | Yes | Rarely |
| Free & unlimited | Yes | Often limited |
| No ads interruption | Yes | Often no |
FAQ
What is a JWT?
JWT (JSON Web Token) is a compact, URL-safe token format for representing claims between parties. It consists of three parts: header, payload, and signature, each Base64URL encoded.
Is it safe to decode JWT tokens?
Yes, decoding a JWT is safe since it's just Base64URL decoding. However, you should never trust the payload data without verifying the signature. JWT decoding is not the same as JWT validation.