JWT Decoder
Decode and inspect JSON Web Tokens
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JWT Decoder: Your Complete Solution
Decode JSON Web Tokens (JWT) instantly to inspect the payload, header, and signature. Understand and debug JWTs for authentication and authorization purposes.
Why is it Useful?
JWTs are widely used for secure data exchange in web applications. This tool:
- Helps developers debug and verify tokens
- Displays decoded token data in a readable format
- Supports both encoded and base64 JWT strings
- Facilitates security checks by revealing claims and expiration
- Does not require any backend setup or software installation
Key Features
- Decode JWT: Instantly parse token header, payload, and signature
- Human-readable format: JSON viewer with syntax highlighting
- Copy & export: Easily copy decoded information
- Error handling: Detect invalid or malformed tokens
- Secure: Decoding happens locally, no token data is sent anywhere
How to Use?
- Paste your JWT string into the input field
- The tool automatically decodes and displays the token parts
- Review the header, payload claims, and signature sections
- Copy or export the decoded JSON as needed
- Use the decoded information for debugging or verification
Use Cases
Ideal for:
- Developers: Debug authentication and authorization tokens
- Security analysts: Inspect JWT contents for vulnerabilities
- API testers: Verify tokens while testing endpoints
- Educators: Teach how JWTs work and their structure
- QA engineers: Validate token claims and expiry
Benefits
- Quick decoding: No need for complex setup or tools
- Clear visualization: See token details in an easy format
- Privacy safe: Decoding is done client-side only
- Improves debugging: Simplifies token issue resolution
- Free to use: No cost or registration required
Frequently Asked Questions
What is a JWT?
A JWT is a compact, URL-safe token format used to securely transmit information between parties.
Is my token data sent to any server?
No, the decoding happens entirely in your browser for privacy and security.
Can this tool validate the token signature?
No, this tool only decodes the token. Signature validation requires the secret key and backend logic.
What if the token is invalid?
The tool will show an error indicating the token format is incorrect or malformed.
Is this tool free to use?
Yes, it is completely free and accessible online.