JWT Validator
Validate JWT structure, decode header and payload, verify the signing algorithm, and check token expiration.
Enter a JWT token above to validate
We'll check structure, decode header and payload, verify algorithm and expiration
What we check
Structure Check
Validating three-part dot-separated JWT structure
Header Decode
Decoding and parsing the Base64URL-encoded header
Payload Decode
Decoding and parsing the Base64URL-encoded payload
Algorithm Verification
Verifying the signing algorithm is recognized
Expiration Check
Checking token expiration (exp) claim
Learn More
Learn how JWT validation works, the header.payload.signature structure, and security best practices.
What Is a JWT?
A JWT (JSON Web Token) is a compact, URL-safe token format used to securely transmit information between parties as a JSON object. Defined by RFC 7519, JWTs are the de facto standard for authentication and authorization in modern web applications and APIs.