JWT Decoder
Decode and inspect JSON Web Tokens (JWT) to view the header, payload, and signature. This tool helps developers debug JWT tokens, understand their structure, and verify token contents without needing to write code.
When to use this tool
You need to inspect a JWT payload without writing code.
You want to verify claims like exp, iss, or aud quickly.
Examples
Decode claims
Input
eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwiZXhwIjoxNzAwMDAwMDAwfQ.signature
Output
Header: {"alg":"HS256","typ":"JWT"}
Payload: {"sub":"1234567890","exp":1700000000}Use exp to verify when the token expires.
Developer use cases
Debug auth issues by inspecting JWT claims.
Check token expiration timestamps during QA.
Common mistakes to avoid
Assuming decoding validates the signature (it does not).
Sharing production tokens in screenshots or logs.
Format and behavior notes
Decoding does not verify the signature.
JWTs are base64url encoded JSON segments.
Related Tools
Frequently Asked Questions
How do I decode a JWT token?
Paste your JWT token into the input field. The tool will automatically decode and display the header, payload, and signature information.
What information does the decoder show?
The decoder displays the JWT header (algorithm, token type), payload (claims, data), and signature verification status.
Is my JWT token secure?
Yes, all decoding happens in your browser. Your tokens never leave your device, ensuring complete privacy and security.