In this article, we’ll look at how to build a simple CRUD application with Angular 5, Nodejs, Express, and the Angular MongoDB Database Integration.
When it comes to NoSQL databases, MongoDB is frequently cited as one of the best options. NoSQL databases, as opposed to traditional SQL databases, are known for their ability to work with large datasets, providing scalability and flexibility in app development. SQL databases, on the other hand, are relatively stiff and difficult to scale when dealing with large data sets.
- For Development, use Visual Studio Code or another IDM.
- Node.js – If you have already installed the node, check with the node –v command as well as the npm command.
- MongoDB – For this project, we’re using the MongoDB database; however, you could also use SQL or another database.
What is Angular?
Angular (also known as “Angular 2+” or “Angular CLI“) is a free and open-source TypeScript-based web application framework led by Google’s Angular Team and a community of individuals and corporations. Angular is a total rewrite by the same team that created AngularJS.
The MEAN stack, which includes the MongoDB database, the Express.js web application server framework, Angular (or AngularJS), and the Node.js server runtime environment, includes Angular as the frontend.
The AngularJS rewrite was dubbed “Angular 2,” but this caused confusion among developers. To clarify, the Team announced that separate terms for each framework should be used, with “AngularJS” referring to 1x versions and “Angular” without the “JS” referring to versions 2 and up.
Key Features of Angular
- Platform Crossing: Create desktop-installed apps for Mac, Windows, and Linux using the same Angular methods you’ve learned for the web, plus access to native OS APIs.
- Performance & Speed: Serve your application’s first view on Node.js® .NET, PHP, and other servers for near-instant rendering in HTML and CSS. It also paves the way for SEO-optimized websites.
- Productivity: In popular editors and IDEs, you can get intelligent code completion, instant errors, and other feedback.
- Complete Development: With ARIA-enabled components, developer guides, and built-in a11y test infrastructure, you can create accessible applications.
Introduction to MongoDB
MongoDB is a popular open-source NoSQL database written in C++. MongoDB is a Dynamic Schema Document-Oriented Database that stores data in JSON-like documents. It means that when storing your records, you don’t have to worry about the Data Structure, the number of fields or the types of fields used to store values. MongoDB documents are similar to JSON objects.
You can change the structure of records by simply adding new fields or deleting existing ones (referred to as Documents by MongoDB). This MongoDB feature makes it easier to represent Hierarchical Relationships, Store Arrays, and other more complex Data Structures. MongoDB is now used to store massive amounts of data by many tech behemoths, including Facebook, eBay, Adobe, and Google.
Key Features of MongoDB
When compared to other traditional databases, MongoDB has several distinguishing characteristics that make it a superior solution. Some of these characteristics are discussed further below:
- A database with fewer schemas: A Schema-Less Database enables the storage of various types of Documents in a single Collection (the equivalent of a table). In other words, multiple Documents can be stored in a single collection in the MongoDB database, each with its own set of Fields, Content, and Size. MongoDB provides users with a great deal of flexibility as a result of this feature.
- An Indexed Document: Every field in a MongoDB Database Document is indexed with Primary and Secondary Indices, making it easier to retrieve data from the pool.
- Scalability: Using the Shard Key, a large amount of data is partitioned into data chunks, and these data chunks are evenly distributed across Shards that span many Physical Servers.
- Replication: MongoDB ensures high data availability by replicating the data and distributing it across multiple servers so that if one fails, the data can still be retrieved from another.
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- Real-Time: Hevo offers real-time data migration. So, your data is always ready for analysis.
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What is CRUD?
The acronym CRUD stands for Create, Read, Update, and Delete commands. These four major functions provide basic guidance for software developers who work with databases.
Rather than being an architectural system, CRUD operations are cyclic. There are multiple CRUD Cycles for any given dynamic website. Despite its database origins, it now maps the design principles of dynamic applications such as HTTP, SQL, and DDS.
Principles of CRUD
Here are the four CRUD principles:
- Create: A procedure for creating new records using an ‘INSERT’ statement.
- Read: A procedure for reading/retrieving data based on specified input parameters.
- Update: This is a method of modifying records without overwriting them.
- Delete: A method for completely removing one or more entries.
Building a Secure App with CRUD Operations with Angular MongoDB Integration
So, on MLab, connect the Angular 5 App to the MongoDB Database. This was one of the most difficult tasks this GSOC, especially given the scarcity of tutorials on how to connect an existing Angular App to the MEAN stack!
Here are the steps to get started with Angular MongoDB Integration
Angular MongoDB Integration Step 1: Using the Angular CLI, Create a basic Angular 5 App
Install the Angular CLI in the terminal.
sudo npm install -g @angular/cli
So far, we’ve installed the AngularJS Command Line Interface. It’s time to start working on the new Angular App.
Enter the following command:
ng new <name-of-the-app>
Let’s change the directory to our app’s directory.
It’s time to put our Angular App to the test!
ng serve -o
Our browser displays the following page:
Angular MongoDB Integration Step 2: Let’s set up Express, Mongoose, and the body-parser
npm install express — save
npm install mongoose — save
npm install body-parser --save
Express is a web framework for routing and middleware that has very little functionality on its own and is essentially a series of middleware function calls.
Middleware functions have access to the request object (req), the response object (res), and the next middleware function in the request-response cycle of the application. A variable called next is commonly used to denote the next middleware function.
Mongoose facilitates the connection between the NodeJS app and the MongoDB database.
Body-Parser is a body-parsing middleware that allows us to parse incoming request bodies in a middleware before your handlers, which are accessible via the req.body property, take effect.
Angular MongoDB Integration Step 3: Make a new file called server.js
In the text editor, open the server.js file.
Lines 1–4 allow us to use the packages we imported. In lines 5–9, we instantiate a MongoDB database locally, and if there is an error and the DB is unable to connect, we throw an error to the user. Lines 18–24 are used to define the headers.
Lines 26–31 assist us in defining our database schema. In our example, we will only store the user’s name and address, which are both Strings. We defined our API calls in lines 36–87, which allow us to store, update, find, and delete user data from the database.
Angular MongoDB Integration Step 4: Create a new Angular Service to call common AJAX APIs
Create a new Angular Service to call common AJAX APIs.
ng g s common -spec=false
Open src/app/common.service.ts and paste the following code there:
Finally, we update our app’s HTML to display the data!
Angular MongoDB Integration Step 5: It’s time to put our app to use!
- Use mongod to launch a local instance of MongoDB.
- A couple of similar-looking commands appear on the terminal, and the pointer remains there, waiting for connections to the MongoDB Daemon to be established.
- Now, let’s try running our Angular App with the ng serve -o command.
By reading this article, you became acquainted with the CRUD principles. You’ve learned how to create a basic CRUD application using Angular 5, Nodejs, Express, and the Angular MongoDB Integration.
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Share with us your experience of Building a Secure App with CRUD Operations with Angular MongoDB Integration in the comments below!