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AI JWT Decoder

Intelligently parse and validate JWT tokens, auto-decode Header, Payload, Signature with verification and security analysis

JWT Decoder Interface

Interactive decoder will be available soon

Features

  • ✓ One-click decode JWT Token Header, Payload and Signature
  • ✓ Auto-identify HS256, RS256, ES256 and other signing algorithms
  • ✓ Verify token signature validity and check expiration time
  • ✓ Intelligent security level analysis with risk alerts
  • ✓ Batch decoding and token comparison analysis

How to Use

  1. Paste or input JWT Token string
  2. Click decode to view Header and Payload content
  3. Optionally input secret key to verify signature
  4. View security analysis report and token details

FAQ

What is JWT?

JWT (JSON Web Token) is an open standard (RFC 7519) for securely transmitting information between parties. It consists of three parts: Header, Payload, and Signature, transmitted in a compact and self-contained format.

Is decoding JWT safe?

Completely safe. The Header and Payload parts of JWT are Base64-encoded plaintext that anyone can decode. What truly protects the token is the Signature part, which requires a key to verify.

How to verify JWT signature?

You need to provide the same key used during signing (symmetric encryption) or the public key (asymmetric encryption). This tool supports signature verification for HS256, RS256, ES256 and other common algorithms.

Can expired tokens still be decoded?

Yes. Expiration only affects token validity verification, not decoding. This tool clearly indicates whether a token has expired and displays the expiration time.

Which JWT algorithms are supported?

Supports all mainstream JWT signing algorithms including HS256/HS384/HS512 (HMAC), RS256/RS384/RS512 (RSA), ES256/ES384/ES512 (ECDSA) and PS256/PS384/PS512 (RSA-PSS).