var request = require("request");

var options = { method: 'POST',
  url: 'http://mockbin.com/har',
  headers: { 'content-type': 'application/json' },
  body: 
   { number: 1,
     string: 'f"oo',
     arr: [ 1, 2, 3 ],
     nested: { a: 'b' },
     arr_mix: [ 1, 'a', { arr_mix_nested: {} } ],
     boolean: false },
  json: true };

request(options, function (error, response, body) {
  if (error) throw new Error(error);

  console.log(body);
});