API fetch is not responding

Question

I was working on a React APP which fetches data from https://restcountries.com/v2/all and now I have an error.

useEffect(() => {
  fetch(`https://restcountries.com/v2/all`)
    .then((r) => r.json())
    .then((data) => {
      if (data !== undefined) {
        setCountries(data);
      } else {
        alert('Can´t Load Data');
      }
    });
}, []);

Does this answer your question? [How does Access-Control-Allow-Origin header work?](https://stackoverflow.com/questions/10636611/how-does-access-control-allow-origin-header-work) — zero298, Sep 22 '21 at 17:16
If you receive an error you don't understand, please try googling the error message first, before posting here. This is a very common error and simply means that the API you're trying to use is not supposed to be using inside a browser. — ChrisG, Sep 22 '21 at 17:20
There seems to be a recent bug or change in that API. [More](https://gitlab.com/amatos/rest-countries/-/issues/34) — James, Sep 22 '21 at 17:25
Did you add `Access-Control-Allow-Origin: *` to a header in your `fetch` request? — Sharzad Gh, Sep 22 '21 at 17:38
@SharzadGh That won't do anything. That's a response header. That's how the API server tells the browser what domains can use the API. Including it in the fetch is not what needs to happen. — zero298, Sep 22 '21 at 17:56

score 1 · Answer 1 · answered Sep 22 '21 at 18:14

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use this format with header

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// Example POST method implementation:
async function postData(url = '', data = {}) {
  // Default options are marked with *
  const response = await fetch(url, {`enter code here`
    method: 'POST', // *GET, POST, PUT, DELETE, etc.
    mode: 'cors', // no-cors, *cors, same-origin
    cache: 'no-cache', // *default, no-cache, reload, force-cache, only-if-cached
    credentials: 'same-origin', // include, *same-origin, omit
    headers: {
      'Content-Type': 'application/json'
      // 'Content-Type': 'application/x-www-form-urlencoded',
    },
    redirect: 'follow', // manual, *follow, error
    referrerPolicy: 'no-referrer', // no-referrer, *no-referrer-when-downgrade, origin, origin-when-cross-origin, same-origin, strict-origin, strict-origin-when-cross-origin, unsafe-url
    body: JSON.stringify(data) // body data type must match "Content-Type" header
  });
  return response.json(); // parses JSON response into native JavaScript objects
}
}, []);

Your answer could be improved with additional supporting information. Please [edit] to add further details, such as citations or documentation, so that others can confirm that your answer is correct. You can find more information on how to write good answers [in the help center](/help/how-to-answer). — Community, Sep 22 '21 at 21:14

score 0 · Answer 2 · answered Sep 22 '21 at 20:00

You are getting a CORS error which means target domain of api (restcountries) does not allow other domains to fetch data. The solution to this problem is a server side browser or headless browser. Like selenium and puppeteer

https://www.selenium.dev/

https://github.com/puppeteer

But i have tested and api is giving me data in browser with same fetch code. I cant reproduce the problem. Its an issue with something else

API fetch is not responding

2 Answers2

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