Debugged React form validation error. Here is the full story.
CloudSync, a B2B SaaS platform, noticed their signup conversion rate had plummeted from 25% to 5% after a frontend deployment. The signup form appeared to work but silently failed on submission for most users. The bug was intermittent, making it difficult for their internal team to reproduce and diagnose. New user signups dropped by 80%, directly impacting revenue growth.
We traced the issue to a React form validation library update that changed how async validation errors were handled. The email uniqueness check was throwing an unhandled promise rejection on certain email formats, causing the form to silently fail without showing any error to the user. We patched the validation handler, added proper error boundaries, and implemented user-visible error messages for all failure states.
Within 45 minutes, the signup flow was fully operational. CloudSync's conversion rate returned to 25% within 24 hours. Over the following week, they recovered 200+ signups that would have been lost. We also added monitoring to their form submission endpoint to catch similar issues immediately in the future.
"Fixed our signup bug faster than I could write the support ticket. Incredible service."
CloudSync
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