What is fetch

fetch() is used to access resources across the network.

fetch accepts two parameters:

• resource accepts URL string or Request object.
• options accepts object with attributes like method, headers, body.

const response = await fetch(resource[, options]);

Return Value

fetch() starts a request and returns a Promise.

• If the request fails due to network problems, the Promise is rejected
• when the request is complete, the Promise is resolved with the Response object

Handling failed requests

fetch(request)
  .then((response) => {
    if (response.status === 200) {
      return response.json();
    } else {
      throw new Error("response status is not 200, request failed");
    }
  })
  .then((response) => {
    console.debug(response);
    // …
  })
  .catch((error) => {
    console.error(error);
  });