When using request for an http POST you can add parameters this way:

var request = require('request');
request.post({
  url:     '
  form:    { mes: "heydude" }
}, function(error, response, body){
  console.log(body);
});

I had to post key value pairs without form and I could do it easily like below:

var request = require('request');

request({
  url: '
  method: 'POST',
  json: {mes: 'heydude'}
}, function(error, response, body){
  console.log(body);
});

If you're posting a json body, dont use the form parameter. Using form will make the arrays into field[0].attribute, field[1].attribute etc. Instead use body like so.

var jsonDataObj = {'mes': 'hey dude', 'yo': ['im here', 'and here']};
request.post({
    url: '
    body: jsonDataObj,
    json: true
  }, function(error, response, body){
  console.log(body);
});

var request = require('request');
request.post(' 
    {form:{ mes: "heydude" }}, 
    function(error, response, body){
        console.log(body);
});

1. Install request module, using npm install request

2. In code:

   var request = require('request');
   var data = '{ "request" : "msg", "data:" {"key1":' + Var1 + ', "key2":' + Var2 + '}}';
   var json_obj = JSON.parse(data);
   request.post({
       headers: {'content-type': 'application/json'},
       url: '
       form: json_obj
   }, function(error, response, body){
     console.log(body)
   });
   

I have to get the data from a POST method of the PHP code. What worked for me was:

const querystring = require('querystring');
const request = require('request');

const link = '
let params = { 'A': 'a', 'B': 'b' };

params = querystring.stringify(params); // changing into querystring eg 'A=a&B=b'

request.post({
  headers: { 'Content-Type': 'application/x-www-form-urlencoded' }, // important to interect with PHP
  url: link,
  body: params,
}, function(error, response, body){
  console.log(body);
});