Why production readiness matters in NestJS - See It in Action

Why production readiness matters

📖 Scenario: You are building a simple NestJS application that will be used in a real company. To make sure it works well in the real world, you need to prepare it for production. This means setting up the app so it can handle real users safely and reliably.

🎯 Goal: Create a basic NestJS app structure, add a configuration setting for production mode, implement a simple health check route, and finalize the app with production-ready settings.

📋 What You'll Learn

Create a NestJS application module with a controller

Add a configuration variable to indicate production mode

Implement a health check endpoint that returns status

Complete the main bootstrap function with production readiness

💡 Why This Matters

🌍 Real World

Preparing a NestJS app for production ensures it runs reliably and safely when real users access it. Health checks help monitor app health, and configuration flags control behavior based on environment.

💼 Career

Understanding production readiness is essential for backend developers to deploy stable, maintainable, and scalable applications in professional environments.

1

Create the NestJS app module and controller

Create a NestJS module called AppModule and a controller called AppController with a method getStatus() that returns the string 'App is running'.

NestJS

# Your code here to create AppModule and AppController with getStatus method

Need a hint?

Use @Controller() and @Get('status') decorators to create the controller and route.

2

Add a production mode configuration variable

Add a constant variable called isProduction and set it to true to indicate the app is running in production mode.

NestJS

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

@Controller()
export class AppController {
  @Get('status')
  getStatus() {
    return 'App is running';
  }
}

@Module({
  controllers: [AppController],
})
export class AppModule {}

// Your code here to add isProduction variable

Need a hint?

Use const isProduction = true; to set the production mode flag.

3

Implement a health check endpoint

In the AppController, add a new method called healthCheck() with a @Get('health') decorator that returns an object { status: 'ok', production: isProduction }.

NestJS

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

const isProduction = true;

@Controller()
export class AppController {
  @Get('status')
  getStatus() {
    return 'App is running';
  }

  // Your code here to add healthCheck method
}

@Module({
  controllers: [AppController],
})
export class AppModule {}

Need a hint?

Use @Get('health') and return an object with status and production keys.

4

Complete the main bootstrap function with production readiness

Add the bootstrap() async function that creates the NestJS app using AppModule, and if isProduction is true, enable app.enableShutdownHooks(). Then call await app.listen(3000).

NestJS

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

const isProduction = true;

@Controller()
export class AppController {
  @Get('status')
  getStatus() {
    return 'App is running';
  }

  @Get('health')
  healthCheck() {
    return { status: 'ok', production: isProduction };
  }
}

@Module({
  controllers: [AppController],
})
export class AppModule {}

// Your code here to add bootstrap function

Need a hint?

Use NestFactory.create(AppModule) to create the app and call app.listen(3000). Enable shutdown hooks if in production.