JWT Validator Online
Validate JSON Web Tokens (JWT), check signatures, expiration, and other claims. This tool works entirely in your browser for privacy and security.
How to Use the JWT Validator
- Paste your JWT into the input editor
- Optionally provide a secret key for signature validation
- Click the "Validate" button
- View the validation results and decoded header/payload
- Copy results using the copy buttons
Note: This tool performs basic JWT validation including structure checks, expiration validation, and not-before checks. Signature validation is simulated for demonstration purposes. For production use, always validate tokens securely in your backend with proper cryptographic libraries.
What is a JWT Validator?
A JWT (JSON Web Token) Validator is a tool used to decode and verify the integrity of a JWT. It breaks down the token into its three parts: the header, the payload, and the signature. This allows you to inspect the claims within the payload (like user ID, roles, and expiration time) and, if you provide the secret key, to verify that the signature is valid and the token has not been tampered with.
Why Use Our JWT Validator?
- Debugging Authentication: Quickly decode tokens to check the claims and expiration status during development.
- Security Analysis: Verify the signature of a token to ensure it was issued by a trusted source.
- Learning JWTs: A great way to understand the structure of a JSON Web Token and how the different parts work together.
- API Testing: Useful for developers who are building or consuming APIs that use JWT for authentication and authorization.
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