Fetch API error handling

Question

I want to display error message from my API, problem is that I can\'t reach that error if I check for response.ok, it returns Fetch error, not the one from API..

Answer 1

according to This Article :

Per MDN, the fetch() API only rejects a promise when

“a network error is encountered, although this usually means permissions issues or similar.”

Basically fetch() will only reject a promise if the user is offline, or some unlikely networking error occurs, such a DNS lookup failure.

then, you can use this part of code to use non-network error handlings and make your code more readable

function handleErrors(response) {
    if (!response.ok) throw new Error(response.status);
    return response;
}

fetch("API URL")
    // handle network err/success
    .then(handleErrors)
    // use response of network on fetch Promise resolve
    .then(response => console.log("ok") )
    // handle fetch Promise error
    .catch(error => console.log(error) );