JWT Decoder
Decode and inspect JWT tokens instantly. View header, payload, and signature without verification.
How it works
Paste JWT Token
Copy your JWT token from your application or API response.
Decode
Click decode to extract header, payload, and signature.
Inspect Claims
View all claims, expiration time, and token metadata.
Common use cases
API Debugging
Inspect JWT tokens from API responses to debug authentication issues.
Token Validation
Check token expiration, issuer, and claims before using.
Development
Understand JWT structure during development and testing.
Security Audit
Review token contents for security analysis.
Frequently asked questions
What is a JWT token?
JWT (JSON Web Token) is a compact, URL-safe token format used for authentication. It consists of three parts: header, payload, and signature, separated by dots.
Does this tool verify signatures?
No. This tool only decodes the token to show its contents. It does not verify the signature or validate the token.
Is my token stored or sent to a server?
No. All decoding happens in your browser. Your token is never sent to any server.
Can I decode expired tokens?
Yes. This tool decodes any valid JWT format, regardless of expiration status.