simple-ajax

simple-ajax.js

function ajax(url: string, { method = 'GET', data = undefined } = {}) {
  return new Promise((resolve, reject) => {
    const xhr = new XMLHttpRequest();

    xhr.open(method, url);

    if (method === 'POST') {
      xhr.setRequestHeader('Content-Type', 'application/json; charset=UTF-8');
    }

    xhr.onload = () => {
      if (xhr.status >= 200 && xhr.status < 400) {
        resolve(parseJson(xhr.responseText));
      } else {
        reject({ code: xhr.status, message: xhr.responseText }); // eslint-disable-line
      }
    };
    xhr.onerror = reject;
    xhr.send(JSON.stringify(data));
  });
}

function parseJson(str) {
  try {
    return JSON.parse(str);
  } catch (e) {
    return str;
  }
}

export default ajax;