Lovable
security
CORS Misconfiguration in Lovable App
Your Lovable app either blocks legitimate requests with CORS errors or is configured with overly permissive CORS settings (Access-Control-Allow-Origin: *) that allow any website to make requests to your API.
CORS errors appear as failed API calls in the browser console, preventing your app from communicating with its backend or third-party services. On the other hand, wildcard CORS settings mean any malicious website could make requests to your API on behalf of your users.
This commonly happens when your frontend and backend are on different domains, or when Lovable generates API routes without proper CORS configuration.
Error Messages You Might See
Access to fetch at 'https://api...' has been blocked by CORS policy
No 'Access-Control-Allow-Origin' header is present on the requested resource
CORS policy: Response to preflight request doesn't pass access control check
The value of the 'Access-Control-Allow-Origin' header must not be the wildcard '*' when the request's credentials mode is 'include'
Common Causes
- Wildcard origin allowed — The API is configured with Access-Control-Allow-Origin: * which is insecure for authenticated endpoints
- Missing CORS headers — The backend doesn't include the necessary CORS headers, blocking frontend requests
- Credentials with wildcard — Trying to send cookies/auth headers with a wildcard CORS policy, which browsers block
- Preflight request failing — OPTIONS requests are not handled, causing complex requests (POST with JSON) to fail
- Different domains in production — Frontend and API are on different domains but CORS is only configured for localhost
How to Fix It
- Set specific allowed origins — Replace wildcard (*) with your actual frontend domain(s)
- Handle OPTIONS preflight — Make sure your server responds to OPTIONS requests with proper CORS headers
- Allow credentials properly — If using cookies/auth, set Access-Control-Allow-Credentials: true with a specific origin (not wildcard)
- Configure allowed methods and headers — Explicitly list the HTTP methods and headers your frontend needs
- Test with browser DevTools — Check the Network tab for failed preflight requests and missing headers
Real developers can help you.
Daniel Vázquez
Software Engineer with over 10 years of experience on Startups, Government, big tech industry & consulting.
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.
🖋️ Sharing insights through technical writing, blogging, and open-source contributions.
🤝 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.
🌟 Open source contributions on Github & StackOverflow for Flutter & Dart
🎖️ Worked on improving app performance and user experience with smart solutions.
Milan is always happy to connect, work on new ideas, and explore the latest in technology.
Jaime Orts-Caroff
I'm a Senior Android developer, open to work in various fields
Antriksh Narang
5 years+ Experienced Dev (Specially in Web Development), can help in python, javascript, react, next.js and full stack web dev technologies.
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.
prajwalfullstack
Hi Im a full stack developer, a vibe coded MVP to Market ready product, I'm here to help
Matt Butler
Software Engineer @ AWS
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)
Pratik
SWE with 15+ years of experience building and maintaining web apps and extensive BE infrastructure
Caio Rodrigues
I'm a full-stack developer focused on building practical and scalable web applications. My main experience is with **React, TypeScript, and modern frontend architectures**, where I prioritize clean code, component reusability, and maintainable project structures.
I have strong experience working with **dynamic forms, state management (Redux / React Hook Form), and complex data-driven interfaces**. I enjoy solving real-world problems by turning ideas into reliable software that companies can actually use in their daily operations.
Beyond coding, I care about **software quality and architecture**, following best practices for componentization, code organization, and performance optimization.
I'm also comfortable working across the stack when needed, integrating APIs, handling business logic, and helping transform prototypes into production-ready systems.
My goal is always to deliver solutions that are **simple, efficient, and genuinely useful for the people using them.**
You don't need to be technical. Just describe what's wrong and a verified developer will handle the rest.
Get HelpFrequently Asked Questions
What is CORS and why does it exist?
CORS (Cross-Origin Resource Sharing) is a browser security feature that prevents websites from making requests to a different domain than the one that served the page. It protects users from malicious sites making unauthorized API calls.
Is it safe to use Access-Control-Allow-Origin: * ?
Only for public APIs that don't use authentication. For any API that handles user data or requires login, you must specify exact allowed origins.