Curl install need binary inside of nodejs

Hello fellow nerds and nerdettes,

I just started building a little app that uses an external command line interface. The app first checks if the binary is installed in the users path and if not offers to install it for them. The external cli bin is the digitalocean cli and requires to curl, pipe to tar, and then move the bin into the users path. I have built the check if installed functionality and have been reading the child-process api but have been having a hard time figuring out how to console out the status of the exec command other wise it just seems to hang. At first i didn't think it was working but then i noticed it was in fact downloading it. My question is this. How do i pipe the output of cURL to the console to confirm its working? How might i go about testing success then moving on?

const exec = require('child_process').exec

const curlScriptOSX = 'curl -L https://github.com/digitalocean/doctl/releases/download/v1.6.0/doctl-1.6.0-darwin-10.6-amd64.tar.gz | tar xz'

exec(curlScriptOSX, function(error, stdout, stderr) {

  console.log('stdout: ' + stdout);
  console.log('stderr: ' + stderr);

  if(error !== null) {
    console.log('exec error: ' + error);
  }
})

via archae0pteryx