JWT Builder

Developer

Build and encode JSON Web Tokens with custom headers and payloads.

ttb run jwt-builder

Header (Algorithm)

Payload (Data)

Verify Signature (HS256)

HMACSHA256( base64UrlEncode(header) + "." + base64UrlEncode(payload),)

Encoded Token

■ Header■ Payload■ Signature

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How to Use JWT Builder

Input valid JSON payloads into the Header (specifying the signing algorithm like HS256) and Payload (adding claims like user ID or expiration). Finally, provide a secret string. The tool will compute the cryptographic HMAC signature locally in your browser and output a fully valid JWT.

Enter your parameters

Configure the inputs for the Jwt Builder according to your specific needs.

View real-time results

The utility instantly processes your request and displays the calculated outputs directly in your browser.

Copy or Download

Click the copy icon next to the final output to instantly grab the result, or export it if applicable.

Frequently Asked Questions

Is this secure?+

Yes! The entire process relies on the Web Crypto API, meaning your private signature secrets and token data never leave your browser. We do not transmit or store your JWTs anywhere.

What is a JSON Web Token (JWT)?+

A 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. This information can be verified and trusted because it is digitally signed.

JWT Builder

Reach developers using the JWT Builder tool

How to Use JWT Builder

Enter your parameters

View real-time results

Copy or Download

Frequently Asked Questions

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