Features
Decode JWT tokens to view header and payload
Inspect claims like expiration, issuer, and audience
Verify token signatures (HS256, RS256, ES256)
Color-coded token structure visualization
Check token expiration status
Common Use Cases
- Debugging authentication issues in web apps
- Inspecting OAuth2 access and ID tokens
- Verifying JWT claims before deployment
Frequently Asked Questions
What is a JWT token?
A JSON Web Token (JWT) is a compact, URL-safe token format used for securely transmitting information between parties. It consists of three parts: header (algorithm), payload (claims), and signature.
Is it safe to paste my JWT here?
Yes, this tool processes everything client-side in your browser. No data is sent to any server. However, never share production tokens with untrusted tools.
How do I verify a JWT signature?
Enter the signing secret (for HS256) or public key (for RS256/ES256) in the signature verification section. The tool will indicate whether the signature is valid.