JWT Decoder Pro
Inspect, decode, and verify JSON Web Tokens with enhanced details and security.
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Understanding Your JWT Decoder
How It Works:
Paste your JWT into the input field. The tool automatically decodes the header and payload. For signature verification, provide the appropriate secret or public key and click "Verify Signature".
Security Note:
Client-side decoding of header and payload is safe. Signature verification uses a server-side API endpoint; your secret/key is sent to your own server, not stored by this tool beyond the verification request.
Features:
- Real-time JWT decoding.
- Header and Payload pretty-printing with syntax highlighting.
- Signature verification (HS/RS/ES/PS algorithms) via secure API.
- Human-readable timestamps for common claims (exp, iat, nbf).
- Client-side for basic decoding, server-side for verification.
Algorithm Support:
Supports common algorithms like HS256, HS384, HS512, RS256, RS384, RS512, ES256, ES384, ES512, PS256, PS384, PS512. Ensure your key matches the token's algorithm (alg claim in header).
Important: This tool is for developers to debug and understand JWTs. Do not paste sensitive tokens from production systems if you are unsure about your environment's security.