Developer

JWT Inspector & Decoder

Inspect JSON Web Tokens without sending data to external servers.

100% Client-Side Zero Server Logs Instant Execution

Paste your JWT (JSON Web Token)

Waiting for input Paste a valid three-part JWT string (header.payload.signature)

Header (Algorithm & Token Type)

{"alg": "none"}

Payload (Data & Claims)

{"sub": "1234567890"}

How It Works

A JSON Web Token (JWT) is composed of three Base64URL-encoded parts separated by dots: header, payload (claims), and cryptographic signature.

This inspector decodes the tokens entirely client-side in your web browser. Tokens and secret claims never leave your device, ensuring complete privacy during API debugging and authentication audits.

Privacy Guarantee

Your data never leaves your browser. All computations run locally using modern JavaScript algorithms and native Web APIs.

Zero uploads to external cloud databases
No invasive trackers or third-party cookies
Instantly cleared when you close the browser tab

JWT Inspector & Decoder

How It Works

Privacy Guarantee

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