JWT Decoder & Inspector
Decode, inspect, and analyze JSON Web Tokens instantly. 100% client-side — your tokens never leave your browser.
Paste Your JWT Token
What is a JWT Token and How to Decode It?
JSON Web Tokens (JWT) are a compact, URL-safe means of representing claims transferred between parties. They are widely used for authentication and authorization in web APIs. A JWT consists of three Base64URL-encoded parts separated by dots: Header, Payload, and Signature.
How to Use
- Paste your JWT token into the text area above
- The decoder will instantly split and decode the Header and Payload sections
- Check the "Key Claims" panel for important fields like expiration, issuer, and subject
- The token status will show whether the token is valid or expired
Frequently Asked Questions
Yes! Our JWT decoder is 100% client-side. Your token is decoded entirely in your browser using JavaScript and is never sent to any server. However, avoid pasting tokens from production systems that contain sensitive user data as a general security best practice.
This tool decodes and displays the JWT contents but does not cryptographically verify the signature. Signature verification requires the secret key or public key used to sign the token, which should be kept secure on your server.
Common JWT claims include: sub (subject/user ID), iat (issued at timestamp), exp (expiration timestamp), iss (issuer), aud (audience). Our decoder shows human-readable dates for timestamp fields automatically.
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