Emergent.sh App Not Working? A Developer's Diagnosis Guide

Emergent.sh runs a full AI agent loop to plan, build, and test your app autonomously. The results can be impressive. They can also be incomplete, broken in subtle ways, or have parts the AI chose to stub out rather than implement fully.

Step 1: Check What Was Built vs What Was Planned

Emergent generates a plan that sounds complete but often implements only part of it. Look at the agent's output logs — what did it say it would build? Now test each feature. Make a list of what works, what partially works, and what does nothing. This is your fix list.

Step 2: Check the Console for Errors

Open browser DevTools (F12 → Console) and look for red errors. Copy every distinct error and search for it. Most Emergent app errors fall into three categories: missing environment variables, API endpoint errors (404 or 500), and JavaScript runtime errors from undefined values.

Step 3: Check the Network Tab

F12 → Network → filter by Fetch/XHR. Reload the page and look for failed requests (red). Click each failed request and read the response body — this tells you exactly what the backend is returning.

Common Emergent App Problems

• ▸Backend routes that exist in the frontend code but were never implemented in the API
• ▸Database tables that are queried but were never created
• ▸Authentication flow wired on the frontend but not secured on the backend
• ▸File upload UI with no working upload handler
• ▸Payment UI not connected to a real payment processor

What Is Fixable Without Rewriting

Missing environment variables, incorrect API URLs, missing database tables, and broken routing are quick fixes — typically under 2 hours for a developer. Frontend-backend integration gaps (routes that exist but were not implemented) take 4 to 8 hours depending on complexity.

What Usually Requires a Rewrite

If the AI built the wrong architecture — for example, a multi-tenant app where it treated all data as global — that requires more substantial work. If the authentication system has fundamental security flaws rather than just bugs, a rewrite of that module is often faster than patching.

Export to GitHub First

Before doing anything else, export your Emergent project to a GitHub repository. This gives you a version-controlled codebase that any developer can work with directly, independent of the Emergent platform.

Emergent apps that are 70 to 80 percent complete can often be brought to a fully working production state in one to two days of developer work. The AI handles structure and boilerplate; a developer closes the gaps. This is exactly what we do at Saurabh Infosys.