Build a Basic CRUD App with Angular and Node

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In recent years, single page applications (SPAs) have become more and more popular. A SPA is a website that consists of just one page. That lone page acts as a container for a JavaScript application. The JavaScript is responsible for obtaining the content and rendering it within the container. The content is typically obtained from a web service and RESTful APIs have become the go-to choice in many situations. The part of the application making up the SPA is commonly known as the client or front-end, while the part responsible for the REST API is known as the server or back-end. In this tutorial, you will be developing a simple Angular single page app with a REST backend, based on Node and Express.
You’ll be using Angular as it follows the MVC pattern and cleanly separates the View from the Models. It is straightforward to create HTML templates that are dynamically filled with data and automatically updated whenever the data changes. I have come to love this framework because it is very powerful, has a huge community and excellent documentation.
For the server, you will be using Node with Express. Express is a framework that makes it easy to create REST APIs by allowing to define code that runs for different requests on the server. Additional services can be plugged in globally, or depending on the request. There are a number of frameworks that build on top of Express and automate the task of turning your database models into an API. This tutorial will not make use of any of these in order to keep this focused.
Angular encourages the use of TypeScript. TypeScript adds typing information to JavaScript and, in my opinion, is the future of developing large scale applications in JavaScript. For this reason, you will be developing both client and server using TypeScript.
Here are the libraries you’ll be using for the client and the server:

Angular: The framework used to build the client application
Okta for Authorisation: A plugin that manages single sign-on authorization using Okta, both on the client and the server
Angular Material: An angular plugin that provides out-of-the-box Material Design
Node: The actual server running the JavaScript code
Express: A routing library for responding to server requests and building REST APIs
TypeORM: A database ORM library for TypeScript

Start Your Basic Angular Client Application
Let’s get started by implementing a basic client using Angular. The goal is to develop a product catalog which lets you manage products, their prices, and their stock levels. At the end of this section, you will have a simple application consisting of a top bar and two views, Home and Products. The Products view will not yet have any content and nothing will be password protected. This will be covered in the following sections.
To start you will need to install Angular. I will assume that you already have Node installed on your system and you can use the npm command. Type the following command into a terminal.
npm install -g @angular/cli@7.0.2

Depending on your system, you might need to run this command using sudo because it will install the package globally. The angular-cli package provides the ng command that is used to manage Angular applications. Once installed go to a directory of your choice and create your first Angular application using the following command.
ng new MyAngularClient

Using Angular 7, this will prompt you with two queries. The first asks you if you want to include routing. Answer yes to this. The second query relates to the type of style sheets you want to use. Leave this at the default CSS.
ng new will create a new directory called MyAngularClient and populate it with an application skeleton. Let’s take a bit of time to look at some of the files that the previous command created. At the src directory of the app, you will find a file index.html that is the main page of the application. It doesn’t contain much and simply plays the role of a container. You will also see a style.css file. This contains the global style sheet that is applied throughout the application. If you browse through the folders you might notice a directory src/app containing five files.
app-routing.module.ts
app.component.css
app.component.html
app.component.ts
app.component.spec.ts
app.module.ts

These files define the main application component that will be inserted into the index.html. Here is a short description of each of the files:

app.component.css file contains the style sheets of the main app component. Styles can be defined locally for each component
app.component.html contains the HTML template of the component
app.component.ts file contains the code controlling the view
app.module.ts defines which modules your app will use
app-routing.module.ts is set up to define the routes for your application
app.component.spec.ts contains a skeleton for unit testing the app component

I will not be covering testing in this tutorial, but in real life applications, you should make use of this feature. Before you can get started, you will need to install a few more packages. These will help you to quickly create a nicely designed responsive layout. Navigate to the base directory of the client, MyAngularClient, and type the following command.
npm i @angular/material@7.0.2 @angular/cdk@7.0.2 @angular/animations@7.0.1 @angular/flex-layout@7.0.0-beta.19

The @angular/material and @angular/cdk libraries provide components based on Google’s Material Design, @angular/animations is used to provide smooth transitions, and @angular/flex-layout gives you the tools to make your design responsive.
Next, create the HTML template for the app component. Open src/app/app.component.html and replace the content with the following.

Link: https://developer.okta.com/blog/2018/10/30/basic-crud-angular-and-node