JWT Decoder

What is a JWT Decoder?

A JWT (JSON Web Token) decoder splits a JWT into its header, payload and signature components, decoding the Base64URL-encoded sections to reveal the token's claims and metadata.

Why Decode JWTs?

JWTs are used for authentication and authorization in web applications. Decoding them lets you inspect claims, check expiration times and debug authentication issues without exposing the signature.

Features

• Real-time JWT decoding as you paste
• Header, payload and signature sections with copy buttons
• Token expiry detection with visual status indicator
• Quick info cards for algorithm, subject and issued-at
• 100% browser-based — tokens are never sent anywhere