Then let's start creating an express web application with two routes to demonstrate how CORS works. We'll be using express and the cors middleware: $ npm i -save express $ npm i -save cors We'll make a directory for it, enter it and run npm init with the default settings: $ mkdir myapp $ cd myapp $ npm init -y We can use header information to restrict or allow resources from our web server to protect them.īy default requests from any other origins will be restricted by the browser.įor example, while you are still in the development stage - if you are using a frontend library such as React, your front end application will be served on Meanwhile, your Express server might be running on a different port such as CORS is really useful when you're offering a public API and would like to controll the access to certain resources and how people use them.Īlso, if you want to use your own API or files on a different web page you can simply configure CORS to allow that, while still blocking others out. It defines from where the domain request has originated. There is an HTTP header called origin in each HTTP request. If you are currently on and you are referring an image from you won't be able to fetch that image unless allows cross-origin sharing with. For example, only the allowed domains will be able to access hosted files in a server such as a stylesheet, image, or a script. This policy is used to secure a certain web server from access by other website or domain. It is a mechanism to allow or restrict requested resources on a web server depend on where the HTTP request was initiated. What is CORSĬORS is shorthand for Cross-Origin Resource Sharing.
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In this article, we are going to take a look at what CORS is, how you can configure CORS with Express, and how to customize the CORS middleware to your needs.