Developer Tools

JWT Decoder & Debugger

Decode and inspect JSON Web Tokens (JWT) headers, payloads, and claims client-side without sending tokens to any server.

Paste JWT Token:

HEADER (Algorithm & Type):

// Header payload will decode here...

PAYLOAD (Claims & Data):

// Payload claims will decode here...

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Yes, this tool decodes tokens purely in your browser memory using Base64URL parsing. No token is ever transmitted to a server.

It breaks down both the Header (algorithm, token type) and the Payload claims (sub, exp, iat, roles).

It inspects and formats the decoded JSON claims for debugging authentication payloads.