Generate JWT tokens with custom claims and expiration, or decode and validate existing tokens with a visual breakdown.
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IT-Tools Browse 269 Free Tools →A JSON Web Token (JWT) is a compact, URL-safe token for securely transmitting claims between parties. It has three Base64URL-encoded parts: header, payload, and signature.
The header and payload are Base64URL-encoded, concatenated with a dot, and signed using the specified algorithm (e.g., HMAC-SHA256). The signature ensures the token has not been modified.
All token generation and decoding happens entirely in your browser using the Web Crypto API. No data is sent to any server. However, never use tokens generated here in production without proper key management.