Modern Full-Stack Development with Nest js, React, TypeScript, and MongoDB: Part 1

The injection system will wire this to an instance of the RecipesService class, based on the type. By default, injected services are singletons in Nest, so all client classes will get the reference to the same instance. It’s possible to use other “scopes” for services to fine-tune how they are instantiated. Besides constructor injection, Nest supports property-based injection.

With this, we will explore how to set up Nest.js with TypeScript. As seen above, different files and folders could be created as the project grows in size and features. This simple directory structure can be expanded into a complete project by creating folders and arranging them based on their features. Nest.js is important to have a project with a well-structured directory file to be much more readable, understandable, and easy to work with new and old team members to understand. Specifically, services are part of the code block that includes only the business logic. The controller receives a specific request for the application through the routing mechanism created and processes the request.

Creating a data transfer object

Also, the Typescript web framework is officially used in Nest.js to make sure writing clean and correct codes are achieved. We will test our newly developed REST API with Postman and ensure we have the right data. You can read more about Postman and install it on your local machine if you don’t already have it.

At the end of the post you would have created a micro-service that will enable users to create and add a new book with few descriptions to an existing list of books. This could be from a database, but to ensure simplicity in this post, we won’t really be connecting our application to a database yet. But instead, we will make use of a mock data of books and once a new book is created, we will push and add it to the list. Now you have a fully built a RESTful API with Nest.js and tests for its business logic.

Why you should learn NestJS

Next, the Nest.js team focuses on building great architectural structures for enterprise applications right out of the box. Also, you will learn how to connect a MongoDB database with NestJS and build and deploy a full-blown application to the server. NestJS is one of the fastest-growing typescript frameworks in the Node.js ecosystem. You will learn Nest.js from scratch to an advanced level using TypeScript.

• Nest.js is a progressive Node.js framework with a modular architecture for building efficient, reliable, and scalable server-side applications.
• All the methods created above will help facilitate proper interaction with the MongoDB database from the backend API.
• Managing a large-scale application can be tedious, especially when built without a well-planned structure and strict code organization strategy.
• You can see many auto-generated files with a default implementation.
• Here, we have defined a class to represent CreateProductDTO and also added a bit of validation to ensure that the data type of the fields is string.
• This is a nice general document about Nestjs but what does this have to do with Digital Ocean?

In order to scaffold a new Nest.js application, you will need to globally install the Nest CLI application. It is a command-line tool specifically created to craft a new Nest.js app and provide access to several commands to generate different files and produce a well-structured application. The ValidateObjectId() class implements the PipeTransform method from the @nestjs/common module. It has a single method named transform() that takes in value as a parameter — postID in this case. 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. Similarly to the BlogController, each of the asynchronous methods you have defined here has a metadata decorator and takes in a prefix that Nest.js uses as a routing mechanism.

Creating the video controller

This is just a basic Class declaration in TypeScript/JavaScript with a @Controller decorator. All Nest Controllers must have the decorator which is required to define a basic Controller in Nest. It is built with and fully supports TypeScript (yet still https://wizardsdev.com/en/vacancy/middle-senior-nestjs-developer/ enables developers to code in pure JavaScript). It also combines elements of Object Oriented Programming, Functional Programming, and Functional Reactive Programming. This framework is a result of the long days, sleepless nights, and busy weekends.

Oluyemi is a tech enthusiast with a background in Telecommunication Engineering. A full stack software engineer with a passion for sharing knowledge, Oluyemi has published a good number of technical articles and blog posts on several blogs around the world. Being tech savvy, his hobbies include trying out new programming languages and frameworks. A data transfer object (DTO) helps to create and validate a proper data structure for data coming into an application.

Create a new controller

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You will find the complete source code of this tutorial here on GitHub. Heavily inspired by Angular, Nest.js was built with TypeScript and uses Express.js under the hood, which makes it compatible with the majority of Express middleware. While we believe that this content benefits our community, we have not yet thoroughly reviewed it.

What can you use Angular for?

Instead of focusing on frameworks and tools, this architecture focuses on the business logic of the application. If we want to add a new controller/module/service/class/interface along with many other options, we can use nest generate … (CLI generate command) and Nest.js will add scaffolding code for us.

Convinced that TypeScript, Angular, and NestJS are something you want to add to your coding arsenal? Then look no further than the SoloLearn mobile app, where you can take a full-stack course that covers everything you need to know about all of these great tools. NestJS both provides a level of abstraction above more common NodeJS frameworks like Express or Fastify, and exposes their APIs directly to programmers. This allows programmers freedom to use the wide variety of third-party modules which are available for the underlying platform. After running the application, in order to make sure your application is working go to your web browser and type.