@nestjstools/messaging-bootstrap

A lightweight NestJS wrapper around @nestjstools/messaging, designed to simplify bootstrapping messaging-based applications.

Instead of manually configuring messaging in your AppModule, this package lets you quickly set up:

• An HTTP server with messaging support
• A dedicated worker (microservice) that runs only messaging consumers

---

Features

• 🧵 Microservice/worker mode for consumers only
• 🌐 HTTP server with integrated messaging
• 🚀 Clean main.ts bootstrapping

---

Documentation

📘 https://nestjstools.gitbook.io/nestjstools-messaging-docs

---

Example Project (RabbitMQ)

🔗 https://github.com/nestjstools/messaging-rabbitmq-example

---

Installation

npm install @nestjstools/messaging-bootstrap
# or
yarn add @nestjstools/messaging-bootstrap

Peer Dependencies

You must also install the following packages (if not already present in your project):

npm install @nestjs/microservices @nestjstools/messaging
# or
yarn add @nestjs/microservices @nestjstools/messaging

---

⚠️ Warning

Do not call MessagingModule.forRoot() in your AppModule (or in any other module) when using this library.
This method should be invoked only once, and it is already
handled internally by @nestjstools/messaging-bootstrap.

Including it manually will lead to duplicate initialization and unexpected behavior.

---

Getting Started

HTTP Server with Messaging

// main.ts
import { AppModule } from './app.module';
import { AmqpChannelConfig, ExchangeType } from '@nestjstools/messaging';
import { MessagingRabbitmqExtensionModule } from '@nestjstools/messaging-rabbitmq-extension';
import { MessagingBootstrap } from '@nestjstools/messaging-bootstrap';

async function bootstrap() {
  const app = await MessagingBootstrap.createNestApplicationWithMessaging(
    AppModule,
    //You can provide HTTP ADAPTER as second argument (optional)
    {
      messaging: {
        // Load your messaging extensions here (e.g., RabbitMQ, Redis, Amazon SQS, etc.)
        // You can also load it in AppModule
        extensions: [MessagingRabbitmqExtensionModule],

        // Define global message buses
        buses: [{ channels: ['async-command'], name: 'command.bus' }],

        // Configure messaging channels
        channels: [
          new AmqpChannelConfig({
            name: 'async-command',
            connectionUri: 'amqp://guest:guest@localhost:5672/',
            exchangeName: 'my_app_command.exchange',
            bindingKeys: ['my_app_command.#'],
            exchangeType: ExchangeType.TOPIC,
            queue: 'my_app.command',
            avoidErrorsForNotExistedHandlers: false,
            deadLetterQueueFeature: true,
            autoCreate: true,
            // If true, consumers will run in the server app.
            // Set to false when running in HTTP server mode only (no consumers).
            enableConsumer: false,
          }),
        ],
      },

      // Optional: configure NestJS application options here
      nestApplicationOptions: {
        logger: new ConsoleLogger({ json: true }),
      },
    }
  );

  await app.init();
  app.listen(3000);
}

bootstrap();

---

Microservice / Worker Mode

// main.ts
import { AppModule } from './app.module';
import { AmqpChannelConfig, ExchangeType } from '@nestjstools/messaging';
import { MessagingRabbitmqExtensionModule } from '@nestjstools/messaging-rabbitmq-extension';
import { MessagingBootstrap } from './bootstrap';

async function bootstrap() {
  const app = await MessagingBootstrap.createNestMicroserviceWithMessagingConsumer(
    AppModule,
    {
      messaging: {
        // Register messaging extensions (e.g., RabbitMQ, Redis, etc.)
        // You can also load it in AppModule
        extensions: [MessagingRabbitmqExtensionModule],

        // Define global buses and the channels they use
        buses: [{ channels: ['async-command'], name: 'command.bus' }],

        // Configure individual messaging channels
        channels: [
          new AmqpChannelConfig({
            name: 'async-command',
            connectionUri: 'amqp://guest:guest@localhost:5672/',
            exchangeName: 'my_app_command.exchange',
            bindingKeys: ['my_app_command.#'],
            exchangeType: ExchangeType.TOPIC,
            queue: 'my_app.command',
            avoidErrorsForNotExistedHandlers: false,
            deadLetterQueueFeature: true,
            autoCreate: true,

            // Consumers are always enabled in worker mode
            // (i.e., when using createNestMicroserviceWithMessagingConsumer)
          }),
        ],
      },

      // Optional: provide NestJS microservice options here
      nestMicroserviceOptions: {
        logger: new ConsoleLogger({ json: true }),
      },
    }
  );

  await app.init();
  app.listen(3000);
}

bootstrap();