NestJS: The Complete Developer’s Guide

Well, as with most API frameworks, Nest.js defines endpoints through an entity called Controller. Nest.js is a popular and in-demand backend framework in the Node.js ecosystem. You will be working toward a fast response time for front-end queries. In addition, you are in charge of managing the front-end components that your team has designed for the apps. Hence, must exhibit a working proficiency in front-end technology.

When an HTTP request is received, the routing mechanism directs the request to the appropriate controller. The controller then handles the request and returns the appropriate response. Next, click on “Applications” from the side menu to view the list of applications for your account and select the test application that was generated.

Test all endpoints using Postman

Let’s add a User module to handle all user-related operations and to keep tabs on who is creating what post. We might want all our API endpoints to start with api/v1 for different versioning. The post service, controller, post entity, and everything related to post should be grouped into a module (PostsModule). A module is a JavaScript/TypeScript class with the @Module()decorator. The @Module() decorator provides metadata that Nest uses to organise the application structure.

You probably know that I gonna say I really like Nest.js, well yeah, it seems like a great framework to create reliable node.js APIs. It provides tons of functionality out the box, and if you wanna do something special, their documentation is just outstanding. If you come from one of the backgrounds I mentioned previously or you just want to learn something new I would definitely recommend you to give Nest.js a try 🤞.

Updating a Single Post

A framework called Nest (Nest.js) is used to create effective, robust Node.js server-side applications. It mixes features of OOP (Object Oriented Programming),FRP(Functional Reactive Programming), and FP (Functional Programming). JavaScript frameworks go in and out of style very quickly as web technologies change and grow. Nest.js is a good starting point for many developers that are looking to use a modern web framework because https://wizardsdev.com/en/vacancy/middle-senior-nestjs-developer/ it uses a language that is very similar to that of the most used language on the web to this day, JavaScript. Nest.js also uses TypeScript, which is a language that provides the simplicity and power of JavaScript with the type safety of other languages you may be used to. The type safety in Nest.js is only available at compile time, because the Nest.js server is compiled to a Node.js Express server that runs JavaScript.

• We imported all the Sequelize decorators from sequelize-typescript.
• I didn’t know that having good support for following important architectural principles and using mechanisms like dependency injection was even a possibility in Node until discovering NestJS.
• This will take the user email/username and password, then run the validate method on our local strategy class.
• With the method above, any HTTP request from the frontend of this application with a postID that can’t be found in the database will be regarded as invalid.
• Follow the instructions here to download and install it for your choice of the operating system.
• Run nest g co /modules/posts,This will automatically add this controller to the Post module.

In recent years, it has gained increasing popularity with API development reaching 1 million downloads in early October 2021. The open-source NestJS app was inspired by Angular and is a tool that enables developers to build applications that are easy to test, scale, and maintain to increase their productivity. Providers are fundamental to Nest — a provider can be injected as a dependency to create relationships between various objects. Classes such as services, repositories, or helpers can be treated as providers simply by adding Nest’s `@Injectable()` decorator.

The benefits of using Nest.js

You then proceeded to run the application on the default port 5000. Next, you will work on ensuring a successful connection between your app and its database that will be created. You can easily install a new Nest.js project using the command-line interface built specifically for scaffolding Nest applications called Nest CLI. This application will allow users to create a blog post only if they have been authenticated and authorized.

Here you will generate a service, also known as a provider, and afterward, you will create a controller to handle all HTTP requests from the application. Services in Nest.js are meant only to handle any complex business logic for a specific purpose and return the appropriate response to the controller. You will start by using the command-line interface built specifically for scaffolding a new Nest.js application to create yours.

How is Nest.JS different from other frameworks?

However, the highlight of the Nest framework is the power of dependency injection which facilitates code reuse by injecting one module into another. Nest.JS operates on a clear architecture that helps divide applications into microservices using simple components like modules, controllers, and providers. Also, Nest.JS is heavily inspired by the Angular framework that ensures effortless testing and efficient codebase management.

Immediately when you created this API, Auth0 also automatically created a test application for you to use. This is a machine-to-machine application that you will only use here for testing purposes for this part of the tutorial. You will create a new single-page application that will represent the front-end React app in the next part of the tutorial. NestJS framework provides the following common services, and developers focus on business code to build quickly and easily. The complete guide on how to build enterpriseready apps with nestjs is a
“batteryincluded” framework . By the time you complete this course, you will
have the confidence to build any app you can imagine .

Adding code is easy as Nest.JS takes care of the security measurements for you. Multiple processes are present to add third-party operators and plugins to the Nest framework. Nest.JS is a framework for building efficient and scalable server-side applications using JavaScript or TypeScript.

The reason our engineering team chose NestJS is because the NestJS framework checked their three key boxes, is highly customizable, has extensive documentation, and has a broad community of followers. NestJS is a relatively new option in backend development, with many features for building and deploying enterprise services quickly and following the principles of SOLID and 12-factor applications. From the screenshots above, it is obvious that all the implemented logic for your backend API is working properly, but this raises another concern.