nodejs initial setup

 intial setup

npm int

it will ask name, version 1.0.0., description, stating file means app.js or some other

it will generate package.json file

in pacckage.json file 

like bwlow contents

{

    "name": "tutorials",

    "version": "1.0.0",

    "description": "tutorials",

    "main": "first.js",

    "scripts": {

      "test": "echo \"Error: no test specified\" && exit 1",

      "start":"node first.js"

    },

    "author": "",

    "license": "ISC"

  }

  node filename

filename may be first.js or app.js

then run the file and it wil show 

  create first.js

  file

  write the content in that file

  console.log('vamsi');

  when u run after reach that location

  in terminal

  node first.js

  it will show console.log data as vamsi

after taht 

in package.json file

write start in scripts node first.js

whenever run npm start

it will run automiatically node first.js