demo.js

(async() => {
  const o = {
    method: 'POST',
    credentials: 'include',
    headers: {
      accept: 'application/json'
    }
  };

  o.headers['X-RequestDigest'] = (await (fetch(`/_api/ContextInfo`, o).then(res => res.json()))).FormDigestValue;
  const items = await (fetch(`/_api/Lists/GetByTitle('Company')/GetItems(query=@q)?@q=${JSON.stringify({
    ViewXml: '<View><Query><Where><Contains><FieldRef Name="Title" /><Value Type="Text">Micro</Value></Contains></Where></Query></View>'
  })}&$filter=substringof('soft',Title)`, o).then(res => res.json()));
  console.log(items.value);
})();