What is Dependency Injection (DI)? Dependency Injection (DI) is a software design pattern that allows separation of object dependencies and their initialization. In the context of Nest.js, DI enables easier dependency management, reducing class interdependence and increasing application modularity and testability. DI is a software pattern that is not only related to nest.js or node.js … Read more
Introduction to Nest.js “Pipe” Pipes in NestJS are special components used to transform and validate data before it reaches the controller or controller methods. Pipes are useful when we want to ensure that the data we receive in API requests meets certain conditions or is transformed in a specific way. Nest.js comes with built-in pipes … Read more
What are controllers? Controllers in Nest.js are classic TypeScript classes that are decorated with the @Controller() decorator. In such classes, methods corresponding to HTTP operations such as GET, POST, PUT, DELETE are defined, where each method within the controller is decorated with a corresponding HTTP decorator. Example of a simple controller:
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import { Controller, Get, Post, Body, Param } from '@nestjs/common'; @Controller('users') export class UsersController { private users = []; @Get() findAll(): any[] { return this.users; } @Get(':id') findOne(@Param('id') id: string): any { return this.users.find(user => user.id === id); } @Post() create(@Body() user: any): string { this.users.push(user); return 'User created successfully'; } } |
In this example, … Read more
What is Nest.js? Nest.js is a Node.js framework for creating server-side applications. It uses modular architecture, which means that the application is divided into modules, where each module groups related functionality, so that new functionalities can be easily added without disrupting the existing parts of the application. Nest.js uses the TypeScript language (although JavaScript can … Read more
