Render troubleshooting

Fix Render Node Deploy Port Not Detected

Render requires your web service to listen on the PORT environment variable. Local fixed ports can cause deploy health checks to fail.

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Common symptoms

Build succeeds but deploy times out.
Logs say no open ports detected.
App listens on 3000 locally only.

What to check first

Platform: Render
Error: Port not detected

Render requires your web service to listen on the PORT environment variable. Local fixed ports can cause deploy health checks to fail.

Step-by-step fix

Change server listen code to use process.env.PORT.
Bind to 0.0.0.0 when the framework requires a host.
Check Render service type is Web Service, not Background Worker.
Redeploy and watch health check logs.

const port = process.env.PORT || 3000;
app.listen(port, "0.0.0.0");

Common mistake to avoid

Do not listen only on localhost in production containers.

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