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Developer Utilities

JWT Decoder

Decodes a JWT's header and payload locally — no signature verification, no network call, no token ever leaves your browser.

FreeNo sign-upRuns in your browser

How it works

  1. 1Paste a JWT
  2. 2The header and payload segments are base64url-decoded
  3. 3Review the decoded claims

Who this is for

  • Inspecting claims in an auth token during debugging
  • Verifying an expiry claim without a backend call
  • Understanding what a third-party token actually contains

Frequently asked questions

Does this verify the token's signature?
No — this only decodes the header and payload, which requires no secret key. It does not verify authenticity.

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