Paste a Node.js server file and this checks it against the failure modes I keep finding in production backends. Missing WebSocket heartbeats, unguarded JSON.parse in socket handlers, no graceful shutdown, secrets in source, pools left at their defaults. It runs in your browser and it's free.
Ashish Prajapati checks Node.js backends for production readiness.
Runs entirely in your browser. Nothing is uploaded, stored, or logged — there's no server behind this page.