Base44 App Not Loading After Publishing
Your Base44 app works perfectly in the editor and preview mode, but after publishing it to a live URL, the app doesn't load. Users see a blank page, a loading spinner that never resolves, or an error message.
This is a common and stressful issue because the app appeared to be fully functional during development. The disconnect between the editor environment and the published environment can be caused by several factors related to how Base44 builds and deploys apps.
In some cases, the app partially loads (the layout appears but data doesn't populate), or certain pages work while others don't.
Error Messages You Might See
Common Causes
- The publish process completed with warnings that were overlooked, resulting in a partially built app
- Environment-specific settings (API keys, database connections) differ between preview and production
- JavaScript errors in custom code or components that only manifest in the production build
- The app references assets or resources that are available in the editor but not included in the published build
- A recent change introduced an error that breaks the production build but not the editor preview
How to Fix It
Check the publish logs in your Base44 dashboard for any warnings or errors that occurred during the build process. Even warnings can indicate issues that cause the published app to malfunction.
Open the published app in a browser with the developer console open (F12). JavaScript errors in the console often point directly to the failing component or configuration.
Try re-publishing the app after reverting your most recent changes. If the previous version worked, compare what changed. For persistent deployment failures, a developer can examine the build output and production environment configuration.
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Get HelpFrequently Asked Questions
Why does my Base44 app work in preview but not when published?
The published version uses a different build process and environment. Check the publish logs for errors and open the browser developer console on the published URL for JavaScript errors.
How do I fix a Base44 app that shows a blank page after publishing?
Open the browser developer console to see error messages. Common causes include missing environment settings or JavaScript errors in custom code that only appear in production builds.
Can I roll back a Base44 deployment?
Check if Base44 offers version history or a way to re-publish a previous version. If not, revert your recent changes in the editor and re-publish.