JWT Decoder Online

Paste a JSON Web Token to instantly decode its header and payload. Check expiration status. Free, no signup.

Header (JOSE)

Payload (Claims)

Signature

What is JWT?

JSON Web Token (JWT) is an open standard (RFC 7519) for securely transmitting information between parties as a JSON object. JWTs are commonly used for authentication and authorization in web applications. A JWT consists of three parts: Header, Payload, and Signature, separated by dots.

JWT Decoder API

Decode JWTs programmatically:

curl -X POST https://api.fengdeagents.site/api/jwt/decode \
  -H "X-API-Key: YOUR_KEY" \
  -H "Content-Type: application/json" \
  -d '{"token": "eyJhbGciOiJIUzI1NiIs..."}'

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