Beautify / Deobfuscate Javascript via various sources (nodejs script)

beautify.js

var beautify = require('js-beautify').js;
var fs = require('fs');
var ArgParser = require('argparse').ArgumentParser;
var http = require('http');

var ap = ArgParser({});
ap.addArgument('filename', {
  'help': 'input js filename'
});
ap.addArgument(['-s', '--source'], {
  'help': 'source: "b" (js-beautify, node module) or "n" (jsnice.org, website)'
});

args = ap.parseArgs();

var filename = args.filename;
var source = args.source;

//source: jsnice.org
function unpackJS(input_text) {
  var code = input_text;
  if (input_text.startsWith("eval(")) {
    input_text = "code = (" + input_text.substr(5);
    eval(input_text);
  }
  return code;
}

jsfile = fs.readFileSync(filename, 'utf8');
var code = unpackJS(jsfile);

if (source == 'b') {
  console.log(beautify(code, {
    indent_size: 2,
    space_in_empty_paren: true
  }));
} else if (source == 'n') {
  //ref: https://flaviocopes.com/node-http-post/
  const options = {
    hostname: 'jsnice.org',
    port: 80,
    path: '/beautify?pretty=1&rename=1&types=1&packers=1&transpile=0&suggest=0',
    method: 'POST',
    headers: {
      'Content-Type': 'application/json',
      'Content-Length': code.length
    }
  };

  const req = http.request(options, (res) => {
    //console.log(`statusCode: ${res.statusCode}`)

    res.on('data', (d) => {
      o = JSON.parse(d);
      process.stdout.write(o.js)
    })
  });

  req.on('error', (error) => {
    console.error(error)
  });

  req.write(code);
  req.end();
} else {
  console.log("invalid source");
}