# How to create a directory if it doesn't exist using Node.js

In Node.js, you can use the `fs` (file system) module to create a directory if it doesn't exist. The `fs` module provides the `mkdir` function for creating directories. Here's an example:

```jsx
const fs = require('fs');

const directoryPath = './myDirectory';

// Check if the directory exists
if (!fs.existsSync(directoryPath)) {
  // If it doesn't exist, create the directory
  fs.mkdirSync(directoryPath);

  console.log(`Directory '${directoryPath}' created.`);
} else {
  console.log(`Directory '${directoryPath}' already exists.`);
}
```

In this example:

- The `fs.existsSync()` function checks if the directory already exists.
- If the directory doesn't exist (`!fs.existsSync(directoryPath)`), the `fs.mkdirSync()` function is used to create the directory synchronously.
- If the directory already exists, a message is logged indicating that the directory is already present.

If you prefer an asynchronous approach, you can use the `fs.promises.mkdir()` function:

```jsx
const fs = require('fs').promises;

const directoryPath = './myDirectory';

// Use fs.promises.mkdir() to create the directory asynchronously
fs.promises.mkdir(directoryPath)
  .then(() => console.log(`Directory '${directoryPath}' created.`))
  .catch(err => console.error(`Error creating directory: ${err.message}`));
```

Note that the asynchronous method returns a promise, and you can use `.then()` to handle success and `.catch()` to handle errors.

Choose the synchronous or asynchronous approach based on your application's requirements. If you're working with other asynchronous operations, using the asynchronous method might be more appropriate to avoid blocking the event loop.