Question 1

What is the JWT Builder & Signer tool used for?

Accepted Answer

This tool allows you to build, sign, and verify JSON Web Tokens (JWT) directly within your web browser. You can configure standard or custom claims, select an HMAC algorithm, and generate a signed token or validate an existing signature instantly.

Question 2

How do I create a signed JWT using this tool?

Accepted Answer

To create a token, enter your desired payload claims and a secret key into the interface, then select your preferred HMAC algorithm such as HS256, HS384, or HS512. The tool uses the Web Crypto API to generate a signed JWT string that you can copy and use in your applications.

Question 3

Is it safe to enter my secret key into this JWT builder?

Accepted Answer

Yes, your data remains secure because the tool runs entirely in your browser using the Web Crypto API. Your secret key and claims are processed locally on your device and are never transmitted to a server, ensuring complete data privacy.

Question 4

Which HMAC algorithms are supported for signing tokens?

Accepted Answer

The JWT Builder & Signer supports the most common HMAC-based signing algorithms. You can choose between HS256 (HMAC with SHA-256), HS384 (HMAC with SHA-384), or HS512 (HMAC with SHA-512) to sign your tokens.

Question 5

Can I use this tool to verify an existing JWT signature?

Accepted Answer

Yes, you can switch the tool to Verify mode to validate the signature of any existing JWT. By providing the token and the corresponding secret key, the tool will confirm if the signature is valid and matches the provided header and payload.

Question 6

Is there a cost or limit to using the JWT Builder?

Accepted Answer

This is a free security tool with generous rate limits for all users. Anonymous users can perform up to 200 operations, while authenticated users can perform up to 1,000 operations, making it ideal for both quick tests and intensive development work.

Question 7

What are the technical requirements to run this JWT tool?

Accepted Answer

The tool requires a modern web browser that supports the Web Crypto API. Since it is a browser-based utility, there is no software to install, and it works across all major operating systems including Windows, macOS, and Linux.

JWT Builder & Signer

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