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.
Meïr Ankri
Full-stack developer specializing in React / Next.js / Node.js with 6+ years of experience. I've worked across various sectors including automotive (Reezocar/Société Générale), healthcare (Medical Link SaaS), and e-commerce (Glasman). I build web apps end-to-end, from architecture to production, with a focus on scalability, performance, and code quality. I also mentor junior developers and contribute to technical decisions and code reviews.
Nam Tran
10 years as fullstack developer
Yovel Cohen
I got a lot of experience in building Long-horizon AI Agents in production, Backend apps that scale to millions of users and frontend knowledge as well.
Pratik
SWE with 15+ years of experience building and maintaining web apps and extensive BE infrastructure
Basel Issmail
’m a Senior Full-Stack Developer and Tech Lead with experience designing and building scalable web platforms. I work across the full development lifecycle, from translating business requirements into technical architecture to delivering reliable production systems.
My work focuses on modern web technologies, including TypeScript, Angular, Node.js, and cloud-based architectures. I enjoy solving complex technical problems and helping teams turn product ideas and prototypes into working platforms that can grow and scale.
In addition to development, I often collaborate closely with product managers, business analysts, designers, and QA teams to ensure that solutions align with both technical and business goals.
I enjoy working with startups and product teams where I can contribute both as a hands-on engineer and as a technical partner in designing and delivering impactful software.
Taufan
I’m a product-focused engineer and tech leader who builds scalable systems and turns ideas into production-ready platforms.
Over the past years, I’ve worked across startups and fast-moving teams, leading backend architecture, improving system reliability, and shipping products used by thousands of users. My strength is not just writing code — but connecting product vision, technical execution, and business impact.
Kingsley Omage
Fullstack software engineer passionate about AI Agents, blockchain, LLMs.
Matt Butler
Software Engineer @ AWS
Franck Plazanet
I am a Strategic Engineering Leader with over 8 years of experience building high-availability enterprise systems and scaling high-performing technical teams. My focus is on bridging the gap between complex technology and business growth.
Core Expertise:
🚀 Leadership: Managing and coaching teams of 15+ engineers, fostering a culture of accountability and continuous improvement.
🏗️ Architecture: Enterprise Core Systems, Multi-system Integration (ERP/API/ETL), and Core Database Structure.
☁️ Cloud & Scale: AWS Expert; architected systems handling 10B+ monthly requests and managing 100k+ SKUs.
📈 Business Impact: Aligning tech strategy with P&L goals to drive $70k+ in monthly recurring revenue.
I thrive on "out-of-the-box" thinking to solve complex technical bottlenecks and am always looking for ways to use automation to improve business productivity.
Luca Liberati
I work on monoliths and microservices, backends and frontends, manage K8s clusters and love to design apps architecture
You don't need to be technical. Just describe what's wrong and a verified developer will handle the rest.
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.