How to Run Your NestJs App in Docker Using nx/monorepo

Learn how to efficiently run your `NestJs` application inside a Docker container using `nx/monorepo`. Discover step-by-step instructions for generating necessary files and orchestrating your Docker setup.
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Running Your NestJs App in Docker Using Nx/Monorepo

Are you trying to run your NestJs application that resides in an nx/monorepo within a Docker container? You are not alone. Many developers encounter challenges when aiming to containerize their applications, especially in a multi-app structure. In this guide, we'll explore a simple solution that enables you to get your NestJs app up and running inside Docker without unnecessary complications.

Understanding the Problem

When you're working within an nx/monorepo, your application dependencies, such as node_modules, are crucial for your app to function correctly. Simply copying your compiled NestJs code into the Docker image won’t work since it requires these dependencies to run.

Common Obstacle:

Dependencies Missing: Without including the node_modules, your application won’t start, leading to frustrating errors.

Many developers consider copying the main package.json file into the Docker image and running npm install as a potential workaround. While this is a valid approach, let’s explore a more streamlined method provided by Nx that eliminates some manual steps.

Solution Overview: Generate Package.json Automatically

Nx provides an automated solution to include a package.json in the distribution folder of your application, making it easier to manage dependencies when containerizing your app. Here’s how you can configure it.

Steps to Generate Package.json

Modify Your Project Configuration:
You need to change the configuration of your NestJs project to include the generatePackageJson option.

Open the project configuration file located at /apps/<your.app>/project.json.

Edit/Add the Configuration:
Update the build target configuration as follows:

[[See Video to Reveal this Text or Code Snippet]]

Build Your Application:
After updating the configuration, proceed to build your application using the following command:

[[See Video to Reveal this Text or Code Snippet]]

Running this will compile your application and automatically generate a package.json file in the dist directory.

Building Your Docker Image

Once you have the package.json generated in the dist folder, you can now create a Dockerfile to build your Docker image.

[[See Video to Reveal this Text or Code Snippet]]

Finalizing Setup

With the Dockerfile ready, you can proceed to build and run your Docker container:

To build your Docker image, use:

[[See Video to Reveal this Text or Code Snippet]]

And to run your application within the Docker container, execute:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

By following these steps, you can efficiently run your NestJs application in Docker using nx/monorepo without the hassle of manually handling dependencies. This method streamlines the process and enables you to leverage the full potential of Nx. Happy coding as you embark on your journey to dockerize your application!

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