What Is Nest js? A Look at the Lightweight JavaScript Framework

This American biotechnology company uses the Nest.js framework on its main website to reliably cater to its patients and to further expand its services. Before jumping into development, you’ll need Node.js installed on your system. Developers write controllers, services, and repositories to write a functionality. Now that you have a basic understanding of what Nest.js is, let’s dive into setting up a simple Nest.js application. For full stack applications, integrating WebSockets can significantly enhance user experience by providing real-time updates. For instance, in a chat application, WebSockets can be used to instantly deliver messages to all connected clients without the need for constant polling.

Building Robust APIs with NestJS: A Developer’s Guide

Later in this guide, we will learn about Modules; one of the major components of a Nest.js application. The src directory is the parent folder for the core of the Nest project. The job of the main.ts file is to load AppModule that is imported from /src/app.module.ts. Nest uses the Jest framework for testing with Jest configuration in the jest-e2e.json file. After choosing a package manager, the installation process continues, then the Nest.js app would be created. Next, we need to ensure that the UsersController and UsersService are registered in the UsersModule.

Step 1: Generate a Service

At this point, Nest is now aware that the controllers and services in the app exist. The next step is to create middleware to protect the video routes from unauthenticated users. Next, we’ll create the streamVideo function to send a video as a stream to the client. If the video id is found, we get the initial range value from the request headers.

Example: Request-Response

For additional functionality, it can be extended using a diverse array of third-party modules. Furthermore, it seamlessly integrates testing and debugging tools, making the testing of application code easier. They are decorated with the @Module decorator and can import other modules, controllers, and providers. Controllers handle incoming requests and return responses to the client. They are decorated with the @Controller decorator and can define routes using decorators like @Get, @Post, @Put, and @Delete.

Creating the video service

Develop robust and scalable custom APIs with Nest.js to streamline your business applications. Flatirons excels in building robust, scalable APIs using Nest.js, enhancing backend solutions with modern architecture. The code snippet above represents a CRUD (create, read, update, delete) application on our API using the Mongoose model to provide them access to our underlying MongoDB database. The service file is responsible for interacting and Middle/Senior Nest.js developer job communicating with the MongoDB database.

Modules

Nest also uses robust Node.js frameworks, like Express (its default) and Fastify, and includes inbuilt support for TypeScript, with the freedom to use pure JavaScript. Controllers in Nest.js are essential for handling incoming requests and returning responses. They are defined using the @Controller() decorator and can handle various HTTP methods, route parameters, and request bodies. By organizing your controllers effectively, you can create a scalable and maintainable server-side application using the Nest.js framework. Nest.js provides a robust and scalable framework for building server-side applications.

• When a user is found, we’ll use bcrypt to compare the entered password to the one stored in the database.
• Next, we’ll add an onSubmit event to the form component and bind the handleSubmit handler.
• NestJS uses a modular architecture, which allows developers to organize code into modules.
• It leverages the Express framework under the hood, providing a robust foundation for developing modern web applications.
• It holds all metadata about the project and defines various functional properties of the project that are needed to install application dependencies or run project scripts.

Then, we’ll create the readVideo function to get video details based on the id in the request parameter. We’ll populate the name of the user who created the video and return this name, createdBy, to the client. Next, we’ll create the video controller using the @Controller decorator and pass in the api URL. Then, we’ll create a VideoController class with a constructor() function where we’ll create a private variable for the VideoSevice class. Next, we’ll create a signup function that will return a user as a promise.

Nest supports dependency injection and you can use it in your Nest applications to enhance the modularity of your project. To return the status code for any request handled on the Nest.js server, the @HttpCode(…) easily comes through. Nest.js provides decorators or handlers for all of the various HTTP methods including @Get(), @Post(), @Put(), @Delete(), @Patch(), @Options(), and @Head(). The @Module() decorator makes it possible to allow developers to define metadata about a class in the Nest app.

Step 1: Generate a Module

With it, developers can abstract away repeated engineering processes to focus solely on developing the business logic. We need to start the development server to ensure everything is working properly before deploying to a live production server. To ensure a successful outcome, Software development it is imperative to steer clear of these problems, as they can lead to maintenance nightmares.