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404: NOT_FOUND on Vercel

Exact error

404: NOT_FOUND. Code: NOT_FOUND

What it means

Vercel has no file or route for the requested path.

Likely causes

• Wrong Output Directory or Framework Preset in project settings.
• Single-page app (Vite/React Router) without a rewrite, so refreshing a deep link 404s.
• Deployment URL pointing to a deleted deployment.

How to fix it

1. Check Project → Settings → Build & Development: framework preset and output directory (Vite uses dist).

2. For SPAs with client-side routing, add a rewrite:

   // vercel.json
   { "rewrites": [{ "source": "/(.*)", "destination": "/index.html" }] }

Related errors

• Lovable app shows a blank white page after deploying elsewhere
• Command "npm run build" exited with 1