javascript describe the process of a fetch] code example

Example 1: get data from api in javascript

const GetData = [];
  useEffect(() => {
    fetch(API_URL)
      .then((res) => res.json())
      .then((data) => {
        GetModesData.push(...data);
        setDataState(GetData.map((d) => d.modeName));
      });
  }, []);

Example 2: .fetch method

fetch('http://example.com/data.json')
  .then(data => data);
  .catch(err => console.log(err));