JWT Decoder
Decode and inspect JWT (JSON Web Token) header and payload. View claims, expiration, and metadata. Free online JWT decod
Decoded JWT will appear here...
How to Use JWT Decoder
- Paste a JWT token: Paste any JWT (JSON Web Token) into the input area. It has three parts separated by dots: header.payload.signature.
- Decode the token: Click Decode to Base64-decode and display the token's header and payload as readable JSON.
- Inspect the claims: View claims like user ID, roles, expiration (exp), and issued-at (iat) time for debugging.
About JWT Decoder
JWT Decoder (JSON Web Tokens) is a tool to read encoded authentication tokens and inspect their inner data (header and payload).
- Split and Decode: A JWT consists of 3 parts (Header.Payload.Signature). This tool decodes them from Base64 and displays them as readable JSON.
- Data Inspection: Easily check claims such as user roles, expiration time (exp), and issued at time (iat).
- Safe & Local: Decoding happens entirely within the browser, ensuring your tokens remain secure (though production secrets shouldn't be verified here).
A must-have tool for debugging auth systems, API development, and frontend logins.
Frequently Asked Questions
What is a JWT?
A JWT (JSON Web Token) is a compact token format used for authentication. It contains three Base64-encoded parts: Header, Payload, and Signature.
Is it safe to decode JWTs here?
Yes! Decoding happens entirely in your browser. No data is sent to any server. However, avoid pasting production tokens with sensitive claims.
What information does a JWT contain?
Common claims include user ID, roles, issued-at time (iat), expiration time (exp), and issuer (iss). The tool displays all claims.