A result in three steps
- 01
Paste a non-sensitive test JWT.
- 02
Decode its header, payload, and time claims.
- 03
Remember that decoding does not verify the signature.
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Data & developer
JWT Decoder
Decodes the Base64URL header and payload of a JSON Web Token in the browser and explains exp, iat, and nbf times. It does not verify the signature or send the token to a server.
✓ Free✓ No account✓ In-browser
Result
Your result will appear here.
When is this tool useful?
- ✓ Authentication debugging
- ✓ Inspecting claims
- ✓ Checking token expiry
Important limitation
Automated output is a preliminary assessment. Do not use it alone for legal, financial, medical, or security-critical decisions.
ABOUT THIS TOOL
Frequently asked questions
Does this tool send input to a server?+
No. Processing runs in this browser tab. Data leaves the page only when you choose to copy or download the result.
Is the result definitive?+
The tool produces consistent output from disclosed rules and browser APIs, but context, data quality, and method limitations can affect it. Verify high-impact decisions.
Is input saved?+
No. Tool input is not persisted to localStorage or another durable store. Only a non-sensitive tool-usage count may be kept on this device for personalized home-page shortcuts.