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.
Real developers can help you.
Prakash Prajapati
I’m a Senior Python Developer specializing in building secure, scalable, and highly available systems. I work primarily with Python, Django, FastAPI, Docker, PostgreSQL, and modern AI tooling such as PydanticAI, focusing on clean architecture, strong design principles, and reliable DevOps practices. I enjoy solving complex engineering problems and designing systems that are maintainable, resilient, and built to scale.
Costea Adrian
Embedded Engineer specilizing in perception systems. Latest project was a adas camera calibration system.
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SW engineer with 6+ years of experience,
I worked with React/Node/Python
did projects with React+Capacitor.js for ios
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Jared Hasson
Full time lead founding dev at a cyber security saas startup, with 10 yoe and a bachelor's in CS. Building & debugging software products is what I've spent my time on for forever
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rayush33
JavaScript (React.js, React Native, Node.js) Developer with demonstrated industry experience of 4+ years, actively looking for opportunities to hone my skills as well as help small-scale business owners with solutions to technical problems
Krishna Sai Kuncha
Experienced Professional Full stack Developer with 8+ years of experience across react, python, js, ts, golang and react-native. Developed inhouse websearch tooling for AI before websearch was solved : )
Matt Butler
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ISHANTDEEP SINGH
Senior Software Engineer with 7+ years of experience in React, JavaScript, TypeScript, Next.js, and Node.js. I’ve also worked as a tech lead for startups, owning end-to-end technical execution including architecture, development, scaling, and delivery. I bring a strong mix of hands-on coding, product thinking, and technical leadership, and I’m comfortable building products from scratch as well as improving and scaling existing systems.
BurnHavoc
Been around fixing other peoples code for 20 years.
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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.