Simply NodeJS Introduction

NodeJS Is

Opensource cross platform run time environment for developing server side web application. It runs on google's V8 JavaScript engine.

NodeJS Is Not

Another web framework. It is a module of JavaScript.
For beginners.
Multi thread.

What is unique about NodeJS

Server side module.
Servers are normally thread based. But NodeJS is event based.
NodeJS programs are executed by V8 JavaScript Engine the same used by Google Chrome browser.

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Building a RESTful CRUD API with Node.js, Express, MongoDB

Used Libraries Express Validator Mongoose _____________Just 3 Steps________________ Step 1 Initialize the project npm init -y npm install --save-dev nodemon npm install express mongoose npm install validator Now go to the package.json and modifiy the scripts property like this. Then create folder call utils and create a file call db.js inside it. Here is my project structure. If you haven't any idea to get MongoDB Connection String please refer first part from here. Follow these set of code for RESTful API crud operations. Step 2 db.js const mongoose = require('mongoose'); const validator = require('validator'); const url = 'MongoDB Connection String'; mongoose.connect(url,{useUnifiedTopology:true,useNewUrlParser:true}); const Schema = mongoose.Schema; const userSchema = new Schema({ name : { type : String, require : true, trim : true }, age : { type

Routing and navigation in Angular

Angular provides a complete routing library with the possibility to have multiple router outlets, different path matching strategies, easy access to route parameters and route guards to protect components from unauthorized access. The Angular router is a core part of the Angular platform. It's very easy to implement routing and navigation. So now I'm going to implement simple application for routing. When we create project it also create app-routing.module.ts file. Then I created 2 components call DepartmentList and EmployeeList. So now what I want is when I Press the the Employee list button I want to move Employee List form and when press the Department list button want to move Department List form. First step You must go to the app-routing.module.ts and you can see there is an array call routes. Then declare your components with name which you want appear on URL. Don't remember import your component. And you must export your components.

An Introduction to Mongoose, Express for MongoDB With NodeJS

This is about how to connect with MongoDB from NodeJS. Used Libraries Express Mongoose Steps... 1. npm init -y 2. npm install --save-dev nodemon coppy this inside package.json "scripts":{ "start": "node app", "dev": "nodemon app" } 3. npm i express mongoose db.js (Inside the utils folder) const mongoose = require('mongoose'); const validator = require('validator'); const url = 'MongoDB Connection String'; mongoose.connect(url,{useUnifiedTopology:true,useNewUrlParser:true}) .then(res => console.log(res)) .catch(err => console.log(err)); app.js const express = require('express'); require('./utils/db'); const app = express(); app.listen(3000); For execute npm run dev

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