Decode JWT authorization tokens locally in your browser to inspect user IDs, roles, and expiration dates without sending secrets online.
JSON Web Tokens (JWT) are used by web applications to handle secure logins. Decoding a token allows developers to inspect user permissions, issue dates, and exact expiration countdowns without exposing sensitive tokens to third-party servers.
Worked example: Check when an API authorization token expires
Input
A standard three-part JWT token string (ey...).
Expected result
A formatted JSON payload showing the user ID, role, and the expiration timestamp converted to your local time.
The base64-encoded token is decoded client-side, showing exactly when the user session will time out.
Before you use the result
- Confirm the expiration time (exp) against your current clock.
- Never paste sensitive production tokens into untrusted public third-party websites.
- Remember that decoding a token reads its data; it does not verify cryptographic signature validity.
If the result is not what you expected
The token says expired even though I just created it.
Check your computer's clock and timezone settings. Token expiration comparisons rely on UTC timestamps matching between server and client.
Step-by-Step Walkthrough
Paste Token
Drop your three-part JSON Web Token string into the input area.
Inspect Claims
Read the parsed header details, payload data, and expiration timer.
Copy Output
Copy the formatted JSON payload or header with a single click.
Key Capabilities & Features
Live token header and payload JSON inspection with syntax formatting
Automatic expiration status check with human-readable timestamps
Built-in sample tokens for quick reference and testing
100% Client-side operation ensuring sensitive tokens never leave your computer
Frequently Asked Questions
Ready to try JWT Decoder & Token Inspector?
Open JWT Decoder & Token Inspector and try the example from this guide. Check the tool page for supported formats, limits, and access requirements.