nx/docs/react/tutorial/05-add-node-app.md

Step 5: Add Node Application Implementing API

The requests fail because the API has not been created yet. Using Nx you can develop node applications next to your React applications. You can use same commands to run and test them. You can share code between the backend and the frontend. Use this capability to implement the API service.

Add Express Capabilities to your workspace

Run the following to add the capability to develop Express applications in your workspace:

npm install --save-dev @nrwl/express

or

yarn add --dev @nrwl/express

Create an Express Application

Run the following to generate a new Express application:

nx g @nrwl/express:app api --frontendProject=todos

Nx will ask you a few questions, and, as with the React application, the defaults will work well here.

After this is done, you should see something like this:

myorg/
├── apps/
│   ├── todos/
│   ├── todos-e2e/
│   └── api/
│       ├── src/
│       │   ├── app/
│       │   ├── assets/
│       │   ├── environments/
│       │   │   ├── environment.ts
│       │   │   └── environment.prod.ts
│       │   └── main.ts
│       ├── jest.conf.js
│       ├── proxy.conf.json
│       ├── tsconfig.app.json
│       ├── tsconfig.json
│       ├── tsconfig.spec.json
│       └── tslint.json
├── libs/
├── workspace.json
├── nx.json
├── package.json
├── tools/
├── tsconfig.json
└── tslint.json

The apps directory is where Nx places anything you can run: frontend applications, backend applications, e2e test suites. That's why the api application appeared there.

You can run:

• nx serve api to serve the application
• nx build api to build the application
• nx test api to test the application

Add a file apps/api/src/app/todos.ts.

import { Express } from 'express';

interface Todo {
  title: string;
}

const todos: Todo[] = [{ title: 'Todo 1' }, { title: 'Todo 2' }];

export function addTodoRoutes(app: Express) {
  app.get('/api/todos', (req, resp) => resp.send(todos));
  app.post('/api/addTodo', (req, resp) => {
    const newTodo = {
      title: `New todo ${Math.floor(Math.random() * 1000)}`
    };
    todos.push(newTodo);
    resp.send(newTodo);
  });
}

Here, you are building an Express application with Nx. Nx also comes with Nest support, and you can also use any other node library you want.

Next.update main.ts to register to routes

import * as express from 'express';
import { addTodoRoutes } from './app/todos';

const app = express();

app.get('/api', (req, res) => {
  res.send({ message: 'Welcome to api!' });
});
addTodoRoutes(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);

!!!!! Run "nx serve api" and open https://localhost:3333/api/todos. What do you see? !!!!! [{"title":"Todo 1"},{"title":"Todo 2"}] Blank screen 404