Stop Wrestling with OpenSSL: Generate JWKS in Seconds via Browser 🔑

devtoolkits — Tue, 17 Feb 2026 08:05:26 +0000

As a web developer working with OAuth2 or OpenID Connect (OIDC), you’ve likely encountered JWKS (JSON Web Key Set). While services like Auth0 or Cognito handle this for you, setting up a local mock server or testing JWT verification often requires generating your own key sets.

Let's be honest: Running complex OpenSSL commands to extract Modulus ($n$) and Exponent ($e$) just to manually build a JSON object is a pain.

That’s why I built a simple, browser-based JWKS Generator.

What is this tool?
It’s a utility within devtoolkits.app that generates RSA key pairs and formats them into JWKS and PEM instantly.

Key Features

Instant RSA Generation: Choose between 2048 or 4096 bits.
Full JWKS Output: Includes kid, alg, and use parameters ready to be used in your /.well-known/jwks.json.
Private Key (PEM): Get the private key simultaneously for signing your test JWTs.
Custom kid: Specify your Key ID to match your existing system configuration.

How to use it

Go to JWKS Generator.
(Optional) Set your kid or Key Size.
Click "Generate Keys".
Copy the JWKS JSON for your public endpoint and the PEM for your signing logic.

Best for

Local Development: Mocking OIDC providers without setting up a real IDP.
Testing: Verifying your application's JWT signature validation logic.
Learning: Seeing exactly what goes into a JWKS object.

Wrap up
Security configuration shouldn't be a bottleneck. I hope this tool saves you some terminal-headaches!

Check it out here: https://devtoolkits.app/en/tools/jwks/

DEV Community: devtoolkits

Stop Wrestling with OpenSSL: Generate JWKS in Seconds via Browser 🔑