Things I Learned While Integrating APIs in Next.js Projects

Hi everyone, Over the last few months I worked on a few projects using Next.js with REST APIs . One thing I realized is that integrating APIs in real applications is very different from small demo projects. There are many small issues that come up which you usually don't notice when learning Next.js for the first time. I wanted to share a few things I learned while dealing with these situations. 1. CORS problems happen more often than expected One issue I ran into multiple times was CORS errors when calling APIs . Sometimes the API worked perfectly in Postman but failed in the browser. At first it was confusing, but later I realized that the browser blocks requests if the backend doesn't allow the origin. In some cases we solved this by updating backend headers, and in other cases we used Next.js API routes as a proxy . That helped avoid the CORS issue completely. 2. Debugging API requests is easier with simple tools While debugging API issues, I started using a few simple techniques: