Quick JS Login Bug Fix

I built a web application with a JavaScript front-end and a Node.js back-end. Everything works except the login + form-submission flow. When a user submits the form the request stalls—sometimes the browser stays idle, other times the console throws a network/validation error. All other screens behave normally, so the fault appears isolated to this route or its supporting API. Here’s what I need from you: • Trace and pinpoint the exact line, component, or middleware causing the failure without introducing regressions elsewhere. • Patch the bug so the form processes, the response returns correctly, and users land on the next screen as intended. • Provide the updated files (client and/or server), a brief note of what changed, and any steps I should run to re-build or deploy. • After I test and confirm the fix in staging, be available for a quick follow-up in case a related edge case surfaces. You’ll be working with vanilla JavaScript on the front end plus Express-based Node.js on the back end, so solid troubleshooting skills with these stacks plus browser dev-tools, Postman, or similar testing utilities will help move this along quickly. Turnaround is important; a concise yet robust fix is the goal.

Project ID: 40423124