node.js

required - ansi,
           http, 
           fs(readFile, readFileSync, writeFile, writeFileSync, appendFile, appendFileSync, (createWriteStream - write, end), createReadStream(on) ), 
           os, 
           events(emitter = new Emitter(), emitter.on, emitter.emit),
           until(util.inherits(User, EventEmitter))
           zlip

module - is a file and it have local variables

var x = 10 / var obj = require('./mod')
global.number = x
export.number = x
module.export = { var : num, syh : hello }
if (module.parent) { module.export = hello } else { hello() } - check module plug-in or executable

search modules
1. system module ('http')
2. root to the file system ('/dbconnection')
3. root to the file system ('./dbconnection') if not found load - json file, or if not - file.node

process.argv[0] //nodePath
process.argv[1] //appPath
process.argv[2] //arg 1
process.argv[3] //arg 2
node app.js 123 123


var http = require("http");
var message = "Hello Worw2d!";
http.createServer(function(request,response){
    console.log(message);
    response.end(message);
}).listen(3000, "127.0.0.1",()=>{
    console.log("Сервер начал прослушивание запросов");
});


var express = require("express");
var app = express();
app.get("/", function(request, response){
    response.end("Hello from Express!");
});
app.listen(3000);



{
  "name": "node",
  "version": "1.0.0",
  "description": "",
  "main": "app.js",
  "scripts": {
    "start": "nodemon server.js",
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "",
  "license": "ISC",
  "dependencies": {
    "express": "^4.16.3"
  },
  "devDependencies": {
    "jasmine-node": "^1.14.5",
    "nodemon": "^1.17.2"
  }
}