# withPipe: Composable API Middleware in Next.js Firebase

> The "withPipe" is a utility function that helps you pipe functions when handling API requests.

*Canonical: https://makerkit.dev/docs/next-fire/api/withPipe*

---

API Routes have several utilities that help you build your API endpoints, and save you from writing boilerplate code.

#### 1. `withPipe`: piping functions when handling API requests

The `withPipe` function is used to pipe functions when handling API requests.

```ts {12}
import { NextApiRequest,NextApiResponse } from "next";

import { withAuthedUser } from '~/core/middleware/with-authed-user';
import { withPipe } from '~/core/middleware/with-pipe';
import { withMethodsGuard } from '~/core/middleware/with-methods-guard';
import { withExceptionFilter } from '~/core/middleware/with-exception-filter';

export default function helloWorld(
  req: NextApiRequest,
  res: NextApiResponse
) {
  const handler = withPipe(
    withMethodsGuard(['GET']),
    withAuthedUser,
    (req, res) => {
      res.status(200).json({ message: 'Hello World!' });
    }
  );

  return withExceptionFilter(req, res)(handler);
}
```

This helps you write the utility functions we will see next in a more readable way.