Free online JWT decoder and validator - Decode JSON Web Tokens locally
Privacy-first
Decode tokens locally
Instant decode
Real-time JWT parsing
Security analysis
Algorithm & expiry check
Paste your JWT token below to decode and inspect its contents
Enter a JWT token and click "Decode Token"
JWT is an open standard (RFC 7519) for securely transmitting information between parties as a JSON object. It consists of three parts: Header (algorithm & token type), Payload (claims), and Signature (verification). JWTs are commonly used for authentication and information exchange.
Yes! All decoding happens entirely in your browser. No JWT data is sent to any server. However, remember that JWTs are not encrypted - they're just base64 encoded. Anyone can decode them, so never store sensitive information in JWT payloads.
Header: Contains the token type (JWT) and signing algorithm. Payload: Contains claims (statements about the user and additional metadata). Signature: Used to verify the token hasn't been tampered with. The signature requires the secret key to verify.
Signature verification requires the secret key (for HMAC algorithms) or public key (for RSA/ECDSA algorithms) that was used to sign the token. This tool only decodes JWTs - it cannot verify signatures without the appropriate keys.
JWT is an open standard (RFC 7519) for securely transmitting information between parties as a JSON object. It consists of three parts: Header (algorithm & token type), Payload (claims), and Signature (verification). JWTs are commonly used for authentication and information exchange.
Yes! All decoding happens entirely in your browser. No JWT data is sent to any server. However, remember that JWTs are not encrypted - they're just base64 encoded. Anyone can decode them, so never store sensitive information in JWT payloads.
Header: Contains the token type (JWT) and signing algorithm. Payload: Contains claims (statements about the user and additional metadata). Signature: Used to verify the token hasn't been tampered with. The signature requires the secret key to verify.
Signature verification requires the secret key (for HMAC algorithms) or public key (for RSA/ECDSA algorithms) that was used to sign the token. This tool only decodes JWTs - it cannot verify signatures without the appropriate keys.