import Tabs from '@theme/Tabs';
import TabItem from '@theme/TabItem';

The following example was tested on Node.js _v20.11_.<br />
We recommend using the latest LTS version of Node.js.<br />
If you already have Node.js + Express.js project set up, you jump to the [next section](#3-setup-nlbridge-expressjs-middleware).

### Set up a new Node.js and Typescript project

We will start by setting up a new Node.js and Typescript project, and install the dependencies.<br />
Create a new directory for your project, navigate to it, and run the following commands:

<Tabs groupId="package" queryString>
    <TabItem value="npm" label="NPM">
        ```bash
        npm init --yes
        npm install --dev typescript ts-node @types/node @types/express @types/cors
        npm install express cors
        npx tsc --init
        ```
    </TabItem>
    <TabItem value="yarn" label="Yarn">
        ```bash
        yarn init --yes
        yarn add --dev typescript ts-node @types/node @types/express @types/cors
        yarn add express cors
        yarn tsc --init
        ```
    </TabItem>
    <TabItem value="pnpm" label="PNPM">
        ```bash
        pnpm init
        pnpm install -D typescript ts-node @types/node @types/express @types/cors
        pnpm install express cors
        pnpm tsc --init
        ```
    </TabItem>
</Tabs>

### Create a simple Express.js endpoint

Next, we will create a simple Express.js endpoint that returns a welcome message.<br />
Create a file called `index.ts` and add the following code:

```ts
import express, { Express, Request, Response } from 'express';
import cors from 'cors';

const app: Express = express();
const port = 8080;

app.use(cors());
app.use(express.json());

app.get('/', (req: Request, res: Response) => {
    res.send('Welcome to NLUX + Node.js demo server!');
});

app.listen(port, () => {
    console.log(`[server]: Server is running at http://localhost:${port}`);
});
```

### Run the Express.js server

Run your Express.js application using the following command:

<Tabs groupId="package" queryString>
    <TabItem value="npm" label="NPM">
        ```bash
        npx ts-node index.ts
        ```
    </TabItem>
    <TabItem value="yarn" label="Yarn">
        ```bash
        yarn ts-node index.ts
        ```
    </TabItem>
    <TabItem value="pnpm" label="PNPM">
        ```bash
        pnpm ts-node index.ts
        ```
    </TabItem>
</Tabs>

This will run your development server on `http://localhost:8080`.<br />
When you navigate to this URL in your browser, you should see the following:

<img
    src="/learn/get-started-guides/localhost-expressjs-empty-server.png"
    alt="localhost-expressjs-empty-server"
    style={{ maxWidth: '500px', border: '1px solid #eaecef', borderRadius: '10px' }}
/>

Now that we have an Express.js server set up, let's add some LLM capabilities.