How To Solve The “TypeError: Failed To Fetch And CORS” In JavaScript

"TypeError: Failed to fetch and CORS" in JavaScript

This guide can help you learn how to solve the error “TypeError: Failed to fetch and CORS” in JavaScript. Follow this article to learn more about it, with the explanation and examples below.

How does the error “TypeError: Failed to fetch and CORS” in JavaScript happen?

There are some reasons that can cause the TypeError: Failed to fetch and CORS in JavaScript occur. 

  • You can encounter this error because an incorrect url passed the fetch method.
  • The COR headers are not sent back by the server you make the request.
  • An incorrect protocol is contained in the URL.
  • The fetch method receives the incorrect methods or headers.

If you encounter these cases, you will receive an output like this.

Output

 TypeError: Failed to fetch and CORS

How to solve the error “TypeError: Failed to fetch and CORS” in JavaScript?

These are some solutions that can help you solve the TypeError: Failed to fetch and CORS. First, be sure you input the correct url to the fetch method. If this is just a protocol problem because you try to call the url by http. So you can fix that by calling the url by https.

Another solution is adding mode: ‘no-cors’ to the request headers.

Let’s learn about them in the following title.

Use https

If this is just a protocol problem because you try to call the url by http. So you can fix that by calling the url by https.

Look at the example below to learn more about this solution.

const report = await fetch('http://randomuser.me/api)

Just replace the http with https, and you will solve the problem. 

const report = await fetch('https://randomuser.me/api)

Add mode:’no-cors’ to the request headers

If the first solution is not effective for your code, you get the error not because of your url. In this case, you have to add mode: ‘no-cors’ to the request headers to solve the problem by using the following syntax. Try this.

await fetch(url, { 
  mode: 'no-cors' 
})

It will work for you.

Summary

There are some solutions that can help you solve the error“TypeError: Failed to fetch and CORS” in JavaScript. To fix this, use https if this is just a protocol problem, or you can add mode:’no-cors’ to the request headers. Choose the solution that is best for you. We hope this tutorial is helpful to you. Thanks!

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