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JWT Decoder

Decode and inspect JSON Web Tokens (JWT) instantly in your browser. View the header, payload, and signature structure without sending any data to a server.

Encoded Token

Header

Payload

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Secure & Private Client-Side

This tool runs entirely in your browser. No data is sent to any server, ensuring your information remains private and secure.

About JWT Decoder

Decode and inspect JSON Web Tokens (JWT) instantly in your browser. View the header, payload, and signature structure without sending any data to a server.

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Frequently Asked Questions

What is a JWT? expand_more

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 decoding safe? expand_more

Yes! Our tool runs entirely in your browser. Your tokens are not sent to any server, ensuring your sensitive data remains private.

Can I verify the signature? expand_more

This tool decodes the token structure but cannot verify the signature without the secret key, which should never be shared.

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Common Use Cases

Debug: Easily check the contents of your JWT tokens.

Verify: Ensure your tokens expire when they should.

Secure: Decoding happens entirely in your browser.

Format: Pretty-print the JSON payload for readability.