JWT Decoder
Decode JSON Web Token header and payload.
Header
Payload
Signature (not verified)
How to use
Runs entirely in your browser. Live updates or click to run. No signup, no tracking, no data sent anywhere.
Part of 71 free tools by Auburn AI. Category: Dev Tools
About this tool
The JWT Decoder takes a JSON Web Token and breaks it apart into its three components: header, payload, and signature. It shows you the raw claims inside the token in readable JSON format. This tool is built for developers and security folks who need to inspect tokens during debugging, API integration, or auth flow troubleshooting without writing a line of code.
Reach for this when you are debugging an authentication issue and need to confirm what claims are actually inside a token, or when you want to check expiry timestamps, user roles, or issuer fields. It is also handy during code review when verifying a token structure matches what your backend expects.
How to use it
- Copy your full JWT string from your browser, app logs, or API response.
- Paste the token into the input field on the decoder page.
- Click Decode to split the token into header, payload, and signature sections.
- Review the payload JSON to inspect claims like sub, exp, iat, and roles.
- Check the header section to confirm the algorithm and token type used.
- Note the exp timestamp and convert it to a human-readable date if needed.
Pro tips
- The exp and iat values are Unix timestamps in seconds, not milliseconds. Divide by 1 and compare to current epoch time to check expiry.
- This tool only decodes the payload; it does not verify the signature. Never trust decoded claims without server-side validation in production.