The Problem: Legacy MongoDB Callbacks

Our infrastructure uses a single Node.js Express server to route traffic for over 100 domains. We recently upgraded our MongoDB driver to version 9, which silently dropped support for legacy callback functions in commands like insertOne().

Because the driver began returning Promises instead of invoking callbacks, every single form submission across the entire portfolio (contact forms, lead generation quotes, newsletter signups, and file downloads) would hang open indefinitely until the NGINX proxy forced a 502 Bad Gateway timeout.

Enter Antigravity

Instead of manually combing through hundreds of lines of routing logic to find and rewrite every legacy callback, we unleashed Antigravity. Using a combination of grep searches and automated code manipulation, Antigravity quickly pinpointed the failure in the /resume-download route.

It didn't stop there. Once it realized the scope of the issue, Antigravity independently scanned the entire forms.ts routing file, identified every other endpoint using the deprecated callback pattern, and wrote a custom script to securely refactor the entire system to modern async/await syntax.

UI Polish & AJAX Upgrades

Before squashing the critical database bugs, we used Antigravity to convert standard HTML forms into sleek, non-reloading AJAX forms. By simply describing the desired states (like swapping a submit button for a spinning SVG loader, and turning the input field green with a checkmark upon success), Antigravity injected the precise React useState hooks and fetch logic required to make it happen without a single page reload.

Conclusion

By delegating the tedious syntactical refactoring to an AI agent, we were able to completely modernize our routing architecture and resolve a system-wide outage in minutes rather than hours. With webdesigner.la officially tagged as complete, we're looking forward to seeing what Antigravity helps us build next.