🪪 JWT Decoder
Decode JWT header and payload locally in your browser for quick inspection during auth debugging. Free, browser-based, and no signup required.
Input
Result
-
❓ Frequently Asked Questions
What does this tool do?
JWT stands for JSON Web Token. It contains a header, payload, and signature and is often used in authentication and session workflows.
What advanced options does it support?
Beyond simple decoding, the page summarizes common claims such as exp, iat, and nbf into readable timestamps so auth debugging is faster.
Is my data uploaded to a server?
No. This page is designed to process input locally in your browser whenever possible, which is better for private debugging workflows.
🎯 Common Use Cases
Inspect auth token claims
Read expiration dates immediately
Check whether a signature segment exists
Debug header/payload locally