Express is mature, minimal, and an open source web framework for making web applications and apis.

Setting Up Express

To create a new workspace with Express, run the following command:

npx create-nx-workspace --preset=express

Adding Express to an Existing Project

Install the express plugin

npm i --save-dev @nx/express
Nx 15 and lower use @nrwl/ instead of @nx/

Creating Applications

Add a new application to your workspace with the following command:

nx g @nx/express:app my-app
Nx 15 and lower use @nrwl/ instead of @nx/

Serve the application by running

nx serve my-app

This starts the application on localhost:3333/api by default.

Express does not come with any library generators, but you can leverage the@nx/js plugin to generate a Node.js library for your express application.

Application Proxies

The Express application generator has an option to configure other projects in the workspace to proxy API requests. This can be done by passing the --frontendProject with the project name you wish to enable proxy support for.

nx g @nx/express:app <express-app> --frontendProject my-react-app
Nx 15 and lower use @nrwl/ instead of @nx/

Using Express

Testing Projects

You can run unit tests with:

nx test <project-name>

Building Projects

Express projects can be built with:

nx build <project-name>

Build artifacts will be found in the dist directory under apps/<project-name> by default. Customize the build configuration by editing outputPath in the project configuration.

Waiting for Other Tasks

You can wait for other tasks to run before serving the express app which can be handy for spinning up various services the application depends on— for example, other apis in a microservice.

Setting the waitUntilTargets option with an array of targets (format: "project:target") executes those tasks before serving the Express application.

More Documentation