fs.writeFile in a promise, asynchronous-synchronous stuff

Question

I need some help with my code. I\'m new at Node.js and have a lot of trouble with it.

What I\'m trying to do:

1) Fetch a .txt with Amazon products (ASINs) ;<

Answer 1

Finally, the latest node.js release v10.3.0 has natively supported fs promises.

const fsPromises = require('fs').promises; // or require('fs/promises') in v10.0.0
fsPromises.writeFile(ASIN + '.json', JSON.stringify(results))
  .then(() => {
    console.log('JSON saved');
  })
  .catch(er => {
    console.log(er);
  });

You can check the official documentation for more details. https://nodejs.org/api/fs.html#fs_fs_promises_api