Building Scalable Applications with NestJS

1. Introduction

NestJS is a progressive Node.js framework for building efficient, reliable, and scalable server-side applications. It uses TypeScript by default and is heavily inspired by Angular's architecture.

2. Key Concepts

@Module({
    imports: [/* other modules */],
    controllers: [/* controllers */],
    providers: [/* services */],
})
export class AppModule {}
            

import { Controller, Get } from '@nestjs/common';

@Controller('users')
export class UsersController {
    @Get()
    findAll() {
        return 'This action returns all users';
    }
}
            

import { Injectable } from '@nestjs/common';

@Injectable()
export class UsersService {
    findAll() {
        return ['user1', 'user2'];
    }
}
            

3. Setting Up NestJS

To set up a new NestJS project, follow these steps:

1. Install the Nest CLI globally:

npm i -g @nestjs/cli

2. Create a new project:

nest new project-name

3. Navigate into the project directory:

cd project-name

4. Start the development server:

npm run start

4. Scalability Techniques

Here are some techniques to enhance the scalability of your NestJS applications:

• Use Microservices Architecture for distributed systems.
• Implement Caching strategies to reduce database load.
• Scale horizontally by adding more instances of your application.
• Optimize database queries and utilize indexes.

5. Best Practices

Consider the following best practices:

• Structure your project with clear module boundaries.
• Utilize dependency injection for services and repositories.
• Write unit tests for your modules and services.
• Document your API using Swagger or Postman.

6. FAQ