JWT Decoder

What is a JWT Decoder?

A JWT (JSON Web Token) Decoder is a security and development tool that decodes and validates JWT tokens to view their contents, verify signatures, and understand token structure. JWTs are commonly used for authentication and authorization in web applications, APIs, and microservices. This decoder helps developers, security professionals, and system administrators decode JWT tokens, view header and payload information, validate signatures, and check token expiration. Whether you're debugging authentication issues, verifying token contents, or learning about JWT structure, this tool provides accurate decoding and validation. Explore our security tools for more authentication and token management utilities.

How to Decode JWT Tokens?

Decoding JWT tokens is simple:

1. Enter JWT Token: Paste your JWT token into the input field (format: header.payload.signature).
2. Decode Token: Click decode to parse the JWT token and view its header, payload, and signature components.
3. View Contents: See the decoded header (algorithm, token type) and payload (claims, user data, expiration) in readable JSON format.
4. Validate Signature (Optional): If you have the secret key, validate the token signature to verify its authenticity.
5. Check Expiration: Review token expiration dates, issued dates, and other standard claims to understand token validity.

This tool is essential for developers debugging authentication, security professionals verifying tokens, or system administrators understanding JWT token structure and contents for security and troubleshooting purposes.