NestJS Basics

Preview — 3 of 10 questions

At its core, what kind of tool is NestJS?

javascript

import { NestFactory } from '@nestjs/core';
import { AppModule } from './app.module';

// Nest wraps a Node HTTP platform (Express by default)
async function bootstrap(): Promise<void> {
  const app = await NestFactory.create(AppModule);
  await app.listen(3000);
}
bootstrap();

AA standalone HTTP server written in Rust that replaces Node.js

BA progressive Node.js framework for building server-side applications, by default running on top of Express

CA frontend UI library similar to React for building component trees

DA database ORM that generates SQL from TypeScript classes

What does NestFactory.create(AppModule) return?

javascript

import { NestFactory } from '@nestjs/core';
import { INestApplication } from '@nestjs/common';
import { AppModule } from './app.module';

const app: INestApplication = await NestFactory.create(AppModule);
await app.listen(3000);

AA plain Express app instance with no Nest features

BA Promise resolving to a Nest application instance bootstrapped from the root module

CThe root module class itself, uninstantiated

DA synchronous object you can use immediately without awaiting

What is the conventional role of the bootstrap() function in main.ts?

javascript

async function bootstrap(): Promise<void> {
  const app = await NestFactory.create(AppModule);
  await app.listen(3000);
}
bootstrap(); // you must invoke it explicitly

AIt is the application entry point that creates and starts the Nest application

BIt defines the database schema for the whole app

CIt is automatically called by the @Module decorator

DIt is a lifecycle hook that runs before every HTTP request

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