To avoid that issue, you need to enable CORS by configuring the appropriate headers on the Next.js server. For example, if you had an application hosted on a different domain that needed to access those APIs in the frontend, it would be blocked by those cross-origin restrictions. However, there are scenarios where you may want to access those endpoints from other origins. This means they can only be accessed in the browser by pages within the same domain. As mentioned earlier, APIs in Next.js do not involve CORS headers by default, following a same-origin policy instead. Next.js has supported API development since v9.4. If you want to change that, you must configure it manually. By default, Next.js relies on a same-origin approach, imposing a strict policy.

Access-Control-Allow-Credentials - Indicates whether the browser should include credentials such as cookies or HTTP authentication in the cross-origin requestĬORS allows frontend applications to access resources from a different domain, ensuring secure cross-origin communication.Access-Control-Allow-Headers - Returned in response to a preflight request to specify the HTTP headers that are allowed in the current request.Access-Control-Allow-Methods - Added to the preflight response to indicate the permitted HTTP methods, such as GET, POST, PUT, etc.Access-Control-Allow-Origin - Specifies the origin that has access to the resource.Otherwise, it gets blocked because of a CORS policy error. If the preflight request is successful, the actual cross-origin request is performed by the browser. The server then responds with some CORS headers, indicating whether the cross-origin should be permitted or denied. To enforce CORS, browsers and servers exchange a set of specific HTTP headers.īefore making certain types of cross-origin requests, the browser sends a preflight request using the HTTP OPTIONS method to the server. Its main goal is to protect user security and prevent unauthorized access to resources and data. In detail, CORS is a protection system implemented by web browsers to enforce restrictions on cross-origin requests. In this context, an “origin” refers to the combination of the protocol, domain, and port number a request comes from.

What is CORS?ĬORS is a security mechanism that enables a server to specify which origins are allowed to access and load resources in a web browser. In this complete guide, you will explore several methods for using CORS in Next.js, enabling you to handle cross-origin requests effectively and securely. When building APIs, it is critical to spend some time on Cross-Origin Resource Sharing (CORS). baseURL: _APP_API_URL || '/api',Ī the past few years, Next.js has become a go-to framework not only for frontend development, but also for robust API development. nnect('mongodb://localhost/myDatabaseName', from 'axios' Res.header('Access-Control-Allow-Origin', ' res.header('Access-Control-Allow-Headers', 'Origin, X-Requested-With, Content-Type, Accept') Here my index.js : import mongoose from 'mongoose' I tried many things I saw in stack overflow issues and node.js, CORS documentation,… but still I’m stuck with this error : The ‘Access-Control-Allow-Origin’ header has a value ‘ that is not equal to the supplied origin.

I’m stuck with this CORS error when I try to register a user on my register Vue Component. I’m trying to make a side project to implement node.js with Vue.js.

Access control allow origin axios