What is CORS and How to Fix CORS Errors

What is CORS and How to Fix CORS Errors

CORS, also known as Cross-Origin Resource Sharing, is something every web developer has to deal with at some point. In this tutorial I will tell you what CORS is and how you can fix CORS errors. Chances are if you are reading this article then you are probably dealing with a CORS error right now.

CORS, also known as Cross-Origin Resource Sharing, is something every web developer has to deal with at some point. Chances are if you are reading this article then you are probably dealing with a CORS error right now. In this article I will tell you what CORS is and how you can fix CORS errors.

What Is CORS?

Does this look familiar?

CORS Error Message

We are attempting to make a request from http://localhost:1234 to a resource located at http://localhost:3000/items which is being blocked by CORS since these two origins are different.

With CORS by default all requests between two different origins are blocked. This is to prevent people from accessing data/APIs on servers they do not control. This is useful since you wouldn’t want random websites to be able to make requests to your social media or bank with the cookies stored in your browser since these cookies may contain your credentials for your bank or social media which means the site could act upon your behalf on your social media or bank.

CORS does not care about requests between the same origin, though. If you have a request that goes from http://localhost:3000 to http://localhost:3000/items that will be allowed since they are the same origin and CORS does not apply to same origin requests.

The origin of the site is simply the scheme (http or https), the hostname (the domain name such as localhost), and the port (3000, 80, etc).

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