Lovable app not deploying or "Publishing failed"? Find the cause, then fix it
Most of the "my Lovable app won't deploy" messages I see come down to one of a handful of causes. Some are inside Lovable (the change was never published, the build failed, a security scan or a workspace policy blocked it). The rest happen when you move the app to Vercel, Netlify or Cloudflare and the host is set up for the wrong kind of build. Here is how I find which one it is, and the fix for…
If your Lovable app won't deploy or publishing has failed, there are a few common reasons. Most of the time, the issue lies within Lovable itself, such as the change not being published, the build failing, a security scan or workspace policy blocking the deployment. However, sometimes the problem occurs when moving the app to external hosting platforms like Vercel, Netlify or Cloudflare, where the host may be configured for the wrong type of build.
To determine the cause, start by opening the Publish dialog and reading any messages displayed. These messages indicate different potential issues, such as the changes not being published, a security scan failure, a policy or permission issue, or an incorrect host setup. Additionally, look for the dot on the Publish button, which indicates unpublished changes.
Next, inspect the build log on the platform where the deployment failed. Check the first error in the log rather than focusing solely on the last line. If your app is a React and Vite project from Lovable, ensure it builds static files into the dist folder. For TanStack Start projects, verify that a server is running on the host, as the build will fail without it.
Additionally, make sure that the required build-time values, such as VITE_SUPABASE_URL and VITE_SUPABASE_PUBLISHABLE_KEY, are set correctly after the build process.
Written by urgent.news from Dev.to's reporting — not their text. Machine-written — may contain errors; check the original before relying on it.
