3.7 KiB
Add a New Express Project
Supported Features
Because we are using an Nx plugin for Express, all the features of Nx are available.
{% pill url="/features/run-tasks" %}✅ Run Tasks{% /pill %} {% pill url="/features/cache-task-results" %}✅ Cache Task Results{% /pill %} {% pill url="/ci/features/remote-cache" %}✅ Share Your Cache{% /pill %} {% pill url="/features/explore-graph" %}✅ Explore the Graph{% /pill %} {% pill url="/ci/features/distribute-task-execution" %}✅ Distribute Task Execution{% /pill %} {% pill url="/features/integrate-with-editors" %}✅ Integrate with Editors{% /pill %} {% pill url="/features/automate-updating-dependencies" %}✅ Automate Updating Nx{% /pill %} {% pill url="/features/enforce-module-boundaries" %}✅ Enforce Module Boundaries{% /pill %} {% pill url="/features/generate-code" %}✅ Use Code Generators{% /pill %} {% pill url="/features/automate-updating-dependencies" %}✅ Automate Updating Framework Dependencies{% /pill %}
Install the Express Plugin
{% callout type="note" title="Keep Nx Package Versions In Sync" %}
Make sure to install the @nx/express version that matches the version of nx in your repository. If the version numbers get out of sync, you can encounter some difficult to debug errors. You can fix Nx version mismatches with this recipe.
{% /callout %}
nx add @nx/express
Create an Application
Use the app generator to create a new Express app.
{% callout type="note" title="Directory Flag Behavior Changes" %}
The command below uses the as-provided directory flag behavior, which is the default in Nx 16.8.0. If you're on an earlier version of Nx or using the derived option, omit the --directory flag. See the as-provided vs. derived documentation for more details.
{% /callout %}
nx g @nx/express:app my-express-api --directory=apps/my-express-api
Serve the API by running
nx serve my-express-api
This starts the application on localhost:3333/api by default.
Create a Library
The @nx/express plugin does not have a library generator, but we can use the library generator from the @nx/js plugin. To create a new library, install the @nx/js package and run:
{% callout type="note" title="Directory Flag Behavior Changes" %}
The command below uses the as-provided directory flag behavior, which is the default in Nx 16.8.0. If you're on an earlier version of Nx or using the derived option, omit the --directory flag. See the as-provided vs. derived documentation for more details.
{% /callout %}
nx g @nx/js:lib my-lib --directory=libs/my-lib
Once the library is created, update the following files.
export function someFunction(): string {
return 'some function';
}
/**
* This is not a production server yet!
* This is only a minimal backend to get started.
*/
import express from 'express';
import * as path from 'path';
const app = express();
app.use('/assets', express.static(path.join(__dirname, 'assets')));
app.get('/api', (req, res) => {
res.send({ message: 'Welcome to my-express-app!' });
});
const port = process.env.PORT || 3333;
const server = app.listen(port, () => {
console.log(`Listening at http://localhost:${port}/api`);
});
server.on('error', console.error);
Now when you serve your API, you'll see the content from the library being displayed.