Base44
auth
Google or Social Login Not Working in Base44 App
You have enabled Google login (or another social OAuth provider) in your Base44 app, but clicking the social login button results in an error. Users may see a Google error page, a "redirect_uri_mismatch" message, or get redirected back to the login page without being authenticated.
This issue is particularly frustrating because social login often works perfectly in the Base44 editor preview but breaks in the published version of the app. The OAuth flow requires precise URL matching that can easily go wrong between environments.
Error Messages You Might See
Error 400: redirect_uri_mismatch
Access blocked: This app's request is invalid
Error: invalid_client
Common Causes
- The OAuth redirect URI configured in your Google/social provider console doesn't match the published app's URL
- Client ID or client secret was copied incorrectly or contains extra whitespace
- The OAuth consent screen has not been published or is still in testing mode with limited test users
- The app's published domain changed (e.g., custom domain added) but the OAuth provider wasn't updated
How to Fix It
Double-check the redirect URI in your OAuth provider's console (e.g., Google Cloud Console). It must exactly match the URL Base44 uses for the callback, including the protocol (https) and any path segments.
If using Google, make sure your OAuth consent screen is configured for production use, not just testing. In testing mode, only explicitly listed test users can log in.
OAuth configuration involves multiple systems and precise URL matching. If you've verified the basics and the issue persists, a developer experienced with OAuth flows can quickly identify the mismatch.
Real developers can help you.
Sage Fulcher
Hey I'm Sage! Im a Boston area software engineer who grew up in South Florida. Ive worked at a ton of cool places like a telehealth kidney care startup that took part in a billion dollar merger (Cricket health/Interwell health), a boutique design agency where I got to work on a ton of exciting startups including a photography education app, a collegiate Esports league and more (Philosophie), a data analytics as a service startup in Cambridge (MA) as well as at Phillips and MIT Lincoln Lab where I designed and developed novel network security visualizations and analytics. I've been writing code and furiously devoted to using computers to make people’s lives easier for about 17 years. My degree is in making computers make pretty lights and sounds. Outside of work I love hip hop, the Celtics, professional wrestling, magic the gathering, photography, drumming, and guitars (both making and playing them)
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 : )
Omar Faruk
As a Product Engineer at Klasio, I contributed to end-to-end product development, focusing on scalability, performance, and user experience.
My work spanned building and refining core features, developing dynamic website templates, integrating secure and reliable payment gateways, and optimizing the overall system architecture.
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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
Milan Surelia
Milan Surelia is a Mobile App Developer with 5+ years of experience crafting scalable, cross-platform apps at 7Span and Meticha. At 7Span, he engineers feature-rich Flutter apps with smooth performance and modern UI. As the Co-Founder of Meticha, he builds open-source tools and developer-focused products that solve real-world problems.
Expertise:
💡 Developing cross-platform apps using Flutter, Dart, and Jetpack Compose for Android, iOS, and Web.
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🤝 Collaborating closely with designers, PMs, and developers to build seamless mobile experiences.
Notable Achievements:
🎯 Revamped the Vepaar app into Vepaar Store & CRM with a 2x performance boost and smoother UX.
🚀 Launched Compose101 — a Jetpack Compose starter kit to speed up Android development.
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Milan is always happy to connect, work on new ideas, and explore the latest in technology.
legrab
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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.
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Luca Liberati
I work on monoliths and microservices, backends and frontends, manage K8s clusters and love to design apps architecture
Antriksh Narang
5 years+ Experienced Dev (Specially in Web Development), can help in python, javascript, react, next.js and full stack web dev technologies.
Jacek Rozanski
Senior PHP/Symfony developer and DevOps engineer with 20+ years of professional experience, running opcode.pl (web development agency, est. 2004).
Day job: I'm the sole backend developer at merketing company where I own and maintain 11 PHP/Symfony microservices on AWS (ECS Fargate, RDS, S3, CloudFront), handle the full CI/CD pipeline (Bitbucket Pipelines, Docker), and manage monitoring with Sentry and CloudWatch. These services handle high request volumes in production every month.
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Tech stack: PHP 8.x, Symfony, React, Next.js, PostgreSQL, MySQL, Docker, AWS (ECS, RDS, S3, SQS/SNS, CloudFront), Terraform, Supabase. I also use AI tools daily (Claude Code, Cursor) in my own workflow, so I understand both the strengths and the gaps in AI-generated code.
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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 Google login fail in my published Base44 app but work in preview?
The published app uses a different URL than the editor preview. You need to add your published app's URL as an authorized redirect URI in the Google Cloud Console.
How do I fix redirect_uri_mismatch in Base44?
Go to your OAuth provider's console and add the exact callback URL your published Base44 app uses. The URL must match exactly, including https and the full path.