nodejs_basic_to_up

nodejs from js basic theories

• Mongodb + native https request + java script socket +

basic introduction and usage PassportJS

1. npm init in console and do above things

            PS D:\2020_practicle\2020NODEJS\http> npm init
            This utility will walk you through creating a package.json file.
            It only covers the most common items, and tries to guess sensible defaults.
   
            See `npm help json` for definitive documentation on these fields
            and exactly what they do.
   
            Use `npm install <pkg>` afterwards to install a package and
            save it as a dependency in the package.json file.
   
            Press ^C at any time to quit.
            package name: (http) demo
            version: (1.0.0) 1.0.0
            description: demo app
            entry point: (http-form-submit.js) index.js
            test command:
            git repository:
            keywords:
            author: chathura deepana
            license: (ISC)
            About to write to D:\2020_practicle\2020NODEJS\http\package.json:
   
            {
            "name": "demo",
            "version": "1.0.0",
            "description": "demo app",
            "main": "index.js",
            "scripts": {
                "test": "echo \"Error: no test specified\" && exit 1",
                "start": "node server.js"
            },
            "author": "chathura deepana",
            "license": "ISC"
            }
   
   
            Is this OK? (yes) yes
   

2. when yes entered [package.json file will be created in the folder].

3. after that we can install any package using npm i [package_name] also. all installed packages dependencies will be mentioned in package.json file.

4. And package-lock.json is include all dependency packages details.

5. install body parser using npm

6. npm install ws ===> this is for installing web socket through npm

7. in mongodb sample project [ (i) first create configure node project usinng "npm init" (ii) after that should install mongodb using "npm install mongodb OR npm install mongodb --save to save] this for depency saving (iii) npm install mongoose after mongodb version 3.0 the another configuration can be use [v3. this] for mongodb connection in node app