# Express

### install

```batch
npm install express
npm i @types/express --save-dev
```

```typescript
#index.ts
import express, { Application, Request, Response } from 'express'
const port = process.env.PORT || 4000
const app: Application = express()
app.get('/', (req: Request, res: Response) => {
    res.send('Hello World!')
})
app.listen(port, () => {
    console.log(`Express server has started on port ${port}`);
});

```

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