JWT Decoder
Decode and inspect JSON Web Tokens to view header and payload data.
Frequently Asked Questions
JWT (JSON Web Token) is a compact, URL-safe token format used for securely transmitting claims between two parties. It consists of header, payload, and signature.
No, this tool only decodes the token for inspection. It does not verify the cryptographic signature. Never trust token data without signature verification.
JWTs are encoded but not encrypted. Anyone can decode the payload. Never store sensitive information like passwords in JWT payloads.
The exp (expiration) claim specifies when the token expires. If current time is after exp, the token should be considered invalid.
To verify a JWT, you need the secret key or public key depending on the signing algorithm. Use a backend service or library like jsonwebtoken (Node.js) or PyJWT (Python).