JWT Token Decoder
Paste any JSON Web Token to instantly decode and inspect its header, payload, and signature. View all claims with human-readable timestamps and expiration status. 100% browser-based — your tokens never leave your device.
Token Input
Paste a JWT tokenPaste a JWT token to decode it instantly
Your token never leaves your browser. Decoding happens locally in real-time.
About JSON Web Tokens
What is a JWT?
A JSON Web Token (JWT) is a compact, URL-safe means of representing claims between two parties. It consists of three parts: a header (algorithm and type), a payload (claims), and a signature. JWTs are commonly used for authentication and authorization in web applications.
Security Note
JWTs are signed but not encrypted by default. Anyone can decode and read the payload — it is only base64url encoded, not encrypted. Never store sensitive information like passwords in JWT payloads. Always verify signatures server-side before trusting claims.
Token Expiration
The "exp" claim defines when a token expires as a Unix timestamp. The "iat" claim marks when it was issued, and "nbf" specifies the earliest time the token can be used. Always check these timestamps to ensure the token is still valid.
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