Common Reasons for CORS Errors
- API Misconfiguration: This happens when the API server is not configured to accept requests from requesting domain.
- Incorrect Client-Side Implementation: This is when the client-side application, like a web browser, doesn’t use the right methods or headers when making a request. It’s akin to speaking a foreign language to the server; if the server doesn’t understand it, it won’t respond favorably.
These are the following methods for Fixing CORS Errors in Next.js and Vercel:
Table of Content
- CORS Configuration in API
- Configuring CORS headers Using next.config.mjs
- Using Middleware in Next.js API Routes
- Configuring Vercel
- Using External Libraries
- Debugging CORS Issues
How to Fix CORS Errors in Next.js and Vercel?
Cross-Origin Resource Sharing (CORS) is a security feature that restricts web apps from making requests to a different domain than the one that served the web page to it. This is needed for security, although sometimes it can block legitimate requests, especially when working with APIs. In this article, we will learn fixing the CORS errors in the Next.js application deployed on Vercel.