JWT Parser

Decode JWT header and payload locally, inspect claims, and review expiration status without sending tokens to a server.

Decoded locally in your browser. Tokens are not sent to a server.

JWT input

Paste a compact JWT with three dot-separated segments. A leading Bearer prefix is accepted.

Decoded JWT sections

Paste a JWT or load the example to decode the header, payload, and signature segment.

Claim insights

Algorithm (alg)
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Type (typ)
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Token status
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Time claims

When to use JWT Parser

Use JWT Parser whenever you need a quick, private look inside a token:

  • Debug authentication flows

    Inspect headers and payload claims while troubleshooting login, SSO, or API authorization issues.

  • Validate token shape

    Confirm a token has three Base64URL segments and that the header and payload contain valid JSON.

  • Review claim timing

    Check exp, iat, and nbf values in raw seconds and readable UTC time before testing requests.

  • Share decoded details

    Copy formatted header, payload, or signature text into tickets, documentation, or pull request reviews.

  • Mobile token checks

    Paste a token on a phone or tablet and review the same decoded sections with touch-friendly controls.

JWT Parser FAQ

How do I use this app?
Paste a compact JWT, or choose Load example. The parser decodes the header and payload automatically and shows copy buttons for each section.
Is this app free to use?
Yes. JWT Parser is free, runs in your browser, and does not require an account.
What happens to my input data?
Your token is decoded locally in the browser. AppDoesIt does not store it or send it to a server for parsing.
Why am I getting an error or unexpected output?
Most errors mean the token does not have three dot-separated Base64URL segments, or the decoded header or payload is not valid JSON.
Where can I find instructions and troubleshooting tips?
Open the Help panel for format guidance, privacy notes, and reminders about decoding versus signature verification.