Developer Tools

JWT Decoder & Validator

Paste your JSON Web Token below to securely decode the Header and Payload entirely in your browser.

Encoded JWT Token

Header (Algorithm & Token Type)

Waiting for token...

Payload (Data & Claims)

Waiting for token...

Signature (Verify Secret)

Waiting for token...

Security Notice

This tool runs completely client-side. Your JWT is decoded inside your browser using JavaScript and is never transmitted over the internet or stored on our servers.

100% Safe & Secure

Frequently Asked Questions

What is a JWT?

JSON Web Token (JWT) is an open standard (RFC 7519) that defines a compact and self-contained way for securely transmitting information between parties as a JSON object.

Is this tool secure?

Yes! The decoding happens entirely in your browser using JavaScript. Your token is never sent to our servers.

Can I decode the signature?

No, the signature is a cryptographic hash (e.g., HMAC SHA256) created using a secret key. You can verify it if you have the secret, but you cannot 'decode' it.

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Header (Algorithm & Token Type)

Payload (Data & Claims)

Signature (Verify Secret)

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