Node.js return data to async function fails

You can think of await as "unpacking" a promise. At the moment your getData isn't returning a Promise and so there is nothing to "unpack". Although you do return new Promise within your function, you're actually returning to the inner callback function, not to your outer getData function.

So, you need to wrap your .get method within a Promise, and resolve the data:

function getData() { 
  var url = 'https://pigfox.com/api/v1/test';
  return new Promise(resolve => { // getData returns a promise
    https.get(url, res => {
      res.setEncoding("utf8");
      res.on('data', data => {
        resolve(data); // resolve data which can be "unpacked" using await
      });
    });
  });
}

async function go() {
  var rs = await getData(); // now we can "unpack" the promise
  console.log('getData(): ' + rs);
}

go();