JWT
Decode and inspect JSON Web Tokens instantly in your browser. This tool helps developers and security professionals analyze JWT structure, validate claims, and troubleshoot authentication issues without compromising security or requiring server-side processing.
JSON Web Tokens (JWT) are compact, URL-safe means of representing claims between parties. The token consists of header, payload, and signature.
Decode JWTs entirely in your browser with no data transmission to external servers, ensuring your sensitive tokens remain private and secure.
Automatically parse and display token expiration (exp), issued-at (iat), and not-before (nbf) claims with clear indicators for expired tokens.
View the complete breakdown of your JWT including header metadata, payload claims, and base64-encoded signature for debugging authentication flows.
Perfect for API testing, OAuth troubleshooting, and understanding token-based authentication systems without needing command-line tools or libraries.
Security Note: This tool decodes but does not verify JWT signatures. Signature verification requires the secret key and should be performed server-side. Never share your JWT tokens publicly, as they may contain sensitive information and grant access to protected resources.