JWT Local Inspector

Decode & verify tokens entirely offline — zero network calls.

Decode a JWT token to readable JSON and verify its signature locally — header, payload and claims. Free, in-browser JWT parser; nothing is uploaded.

About JWT Local Inspector

JWT Local Inspector decodes and inspects JSON Web Tokens entirely offline — header, payload and claims — with zero network calls, so you can debug auth tokens without leaking them to a third-party site.

How to use JWT Local Inspector

  1. Paste a JWT.
  2. Read the decoded header and payload, with expiry and standard claims highlighted.
  3. Verify the signature locally if you provide the secret or public key.

Frequently asked questions

Is it safe to paste a real token here?
Yes — decoding happens entirely in your browser with no network calls, unlike many online JWT debuggers.
Can it verify the signature?
Yes, locally — provide the secret (HS*) or public key (RS*/ES*) and it checks the signature on your device.

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