Developer Tools

JWT Decoder

Decode JWT header and payload claims for debugging.

JWT Decoder parses JSON Web Tokens into header and payload so you can inspect claims without external tooling. It is helpful for API debugging, auth integration checks, and validating fields like `iss`, `aud`, `sub`, and `exp`. This tool is read-only and focused on visibility: it helps you confirm what is inside a token and whether timestamps/claims look correct. It does not verify signatures, so treat it as an inspection aid, not an authentication decision engine.

JWT Input

Decodes header and payload only. Signature is not verified.

Decoded Output

Signature length: 43

Signature preview: SflKxwRJSMeKKF2QT4fwpMeJ...

Header

{
  "alg": "HS256",
  "typ": "JWT"
}

Payload

{
  "sub": "1234567890",
  "name": "ToolPatch",
  "iat": 1700000000,
  "exp": 1900000000
}

Registered Claims

Claim	Value	Interpreted
sub	1234567890	-
iat	1700000000	2023-11-14T22:13:20Z
exp	1900000000	2030-03-17T17:46:40Z

How to use this tool

Paste the full JWT string (three dot-separated segments) into the input field.
Run the decoder and inspect header and payload claims in the output.
Verify expected issuer, audience, and expiration values against your auth configuration.

Developer security tools

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