Client for sending the packed messagepack data to web server

messagepack_client.js

const request = require('request')
const msgpack = require("msgpack-lite");

var packedData =  msgpack.encode({
    "str" : "Something",
    "number" : 4.0,
    "arr": ["one","two"],
    "nClass": {
      "doubleNumber" : 35.0,
      "nums" : [34,23]
    },
    "bool":true
  });
request.post(
    {
        url:'http://localhost:9000/user/msgPackTest', 
        headers: {
            'content-type': 'application/octet-stream'
                },
        body: packedData,
        encoding: null
    }, function optionalCallback(err, httpResponse, body) {
    if (err) {
      return console.error('upload failed:', err);
    }
    console.log('Upload successful!  Server responded with:', msgpack.decode(body));
  });


//   package.json
//   ----------
//   {
//     "name": "msgpack_webserver",
//     "version": "1.0.0",
//     "description": "",
//     "main": "index.js",
//     "scripts": {
//       "test": "echo \"Error: no test specified\" && exit 1"
//     },
//     "author": "",
//     "license": "ISC",
//     "dependencies": {
//       "msgpack-lite": "^0.1.26",
//       "request": "^2.83.0"
//     }
//   }