JWT Decoder & Encoder
Decode, inspect, and encode JSON Web Tokens. Check expiry, view claims, build new JWTs.
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About JWT (JSON Web Token)
A JWT is a compact, URL-safe means of representing claims between two parties. It consists of three Base64url-encoded parts separated by dots: Header.Payload.Signature.
Header declares the token type and signing algorithm. Payload contains the claims (data). Signature verifies the token hasn't been tampered with.
Security note: Never put sensitive data in a JWT payload — it is only encoded, not encrypted and can be read by anyone.