TypeScript CLI: How to save octect-stream response from node-fetch call to Get Request?

Question

I am making a Get Request using Node-Fetch to a web api. It returns octet-stream response to be saved as a file in a local.

I tried using downloadjs (download()) and download.js (downloadBlob()), but both of them did not work.

downloadBlob() returned "createObjectURL is not a function" error, and download() returned "window is not defined at object." error.

The call is below

let res = await fetch(apiURL, {
    method: 'GET',
    headers: {
      'Content-Type': 'application/json',
    }
  })

I think I am completely lost here. What should I do to download the file to local drive? How should I construct .then block here?

Answer 1

downloadjs and download.js won't help because these are front end libraries that trigger the download process in a browser. For instance, when you generate an image on the client (in browser) and want a user to download it.

In order to save an octet-stream in Node(CLI) you can use fs module:

const data = await fetch(apiURL, {
    method: 'GET',
    headers: {
      'Content-Type': 'application/json',
    }
  }).then(res => res.buffer());

fs.writeFile('filename.dat', data, (err) => {
  if (err) throw err;
  console.log('The file has been saved!');
});