About JWT Encoder/Decoder
This tool provides JWT decoding/verification and token generation with HMAC, RSA, RSA-PSS, and ECDSA algorithms.
Key Features
- Dual Modes: Decode and Encode workflows.
- Decode Details: Inspect Header/Payload/Signature and copy each section.
- Signature Verification: Optional key-based verification.
- Token Generation: Configure algorithm, payload, and key to issue JWT.
- Status Insights: Token length and operation feedback.
Steps
- Choose Decode or Encode mode.
- For decode: paste token and optionally verify signature.
- For encode: set algorithm, payload, and key.
- Generate/copy output for testing.
Use Cases
- Authentication integration debugging.
- Investigating JWT format/signature issues.
- Building test tokens in security workflows.
FAQ
Why does signature verification fail?
Common causes: algorithm mismatch, wrong key, or token tampering.
Is this suitable for production key management?
No. Use dedicated key management and security governance in production.