もちろん！以下はExpressとEJSを使ったNode.jsのプログラム例で、ディレクトリを再帰的にスキャンし、入れ子になったファイルとフォルダのリストをウェブページとして提供します：

```
const express = require('express');
const app = express();
const ejs = require('ejs');
const path = require('path');
const fs = require('fs');

// Set the views directory and the view engine
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'ejs');

// Define the route for the directory listing
app.get('/list/:dir(*)', (req, res) => {
  // Get the directory path from the URL parameter
  const dirPath = path.join(__dirname, req.params.dir);

  // Check if the directory exists
  if (fs.existsSync(dirPath)) {
    // Read the contents of the directory
    const files = fs.readdirSync(dirPath);

    // Create an array to hold the nested list data
    const listData = [];

    // Iterate over each file/folder in the directory
    files.forEach(file => {
      // Construct the full path to the file/folder
      const filePath = path.join(dirPath, file);

      // Check if the item is a directory
      if (fs.statSync(filePath).isDirectory()) {
        // Recursively call this function to get the nested list of the subdirectory
        const nestedList = getNestedList(filePath);

        // Add the nested list data to the current item
        listData.push({ name: file, type: 'directory', items: nestedList });
      } else {
        // Add the file data to the current item
        listData.push({ name: file, type: 'file' });
      }
    });

    // Render the EJS template with the nested list data
    res.render('list', { dirPath, listData });
  } else {
    // If the directory does not exist, return a 404 error
    res.status(404).send('Directory not found');
  }
});

// Define the function to recursively get the nested list of a directory
function getNestedList(dirPath) {
  // Read the contents of the directory
  const files = fs.readdirSync(dirPath);

  // Create an array to hold the nested list data
  const nestedList = [];

  // Iterate over each file/folder in the directory
  files.forEach(file => {
    // Construct the full path to the file/folder
    const filePath = path.join(dirPath, file);

    // Check if the item is a directory
    if (fs.statSync(filePath).isDirectory()) {
      // Recursively call this function to get the nested list of the subdirectory
      const subList = getNestedList(filePath);

      // Add the nested list data to the current item
      nestedList.push({ name: file, type: 'directory', items: subList });
    } else {
      // Add the file data to the current item
      nestedList.push({ name: file, type: 'file' });
    }
  });

  // Return the nested list data
  return nestedList;
}

// Start the server on port 3000
app.listen(3000, () => console.log('Server started on port 3000'));
```

このプログラムでは、`/list/:dir(*)` というルートを定義して、ディレクトリのパスをパラメータとして受け取り、そのディレクトリ内のファイルとフォルダのネストされたリストをウェブページとして返す。getNestedList()`関数を使用してディレクトリを再帰的にスキャンし、入れ子リストのデータを構築する。EJSテンプレート `views/list.ejs` は、ネストされたリストデータを持つWebページをレンダリングするために使用される。

注意: このプログラムは、スキャンされるディレクトリがNode.jsアプリケーションを実行しているサーバー上のローカルディレクトリであることを前提としています。リモート・サーバー上のディレクトリをスキャンしたい場合や、クライアント側のウェブ・アプリケーションからスキャンしたい場合は、それに応じてプログラムを修正する必要があります。
Sure! Here is an example program in Node.js using Express and EJS that recursively scans a directory and serves a nested list of files and folders as a webpage:

```
const express = require('express');
const app = express();
const ejs = require('ejs');
const path = require('path');
const fs = require('fs');

// Set the views directory and the view engine
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'ejs');

// Define the route for the directory listing
app.get('/list/:dir(*)', (req, res) => {
  // Get the directory path from the URL parameter
  const dirPath = path.join(__dirname, req.params.dir);

  // Check if the directory exists
  if (fs.existsSync(dirPath)) {
    // Read the contents of the directory
    const files = fs.readdirSync(dirPath);

    // Create an array to hold the nested list data
    const listData = [];

    // Iterate over each file/folder in the directory
    files.forEach(file => {
      // Construct the full path to the file/folder
      const filePath = path.join(dirPath, file);

      // Check if the item is a directory
      if (fs.statSync(filePath).isDirectory()) {
        // Recursively call this function to get the nested list of the subdirectory
        const nestedList = getNestedList(filePath);

        // Add the nested list data to the current item
        listData.push({ name: file, type: 'directory', items: nestedList });
      } else {
        // Add the file data to the current item
        listData.push({ name: file, type: 'file' });
      }
    });

    // Render the EJS template with the nested list data
    res.render('list', { dirPath, listData });
  } else {
    // If the directory does not exist, return a 404 error
    res.status(404).send('Directory not found');
  }
});

// Define the function to recursively get the nested list of a directory
function getNestedList(dirPath) {
  // Read the contents of the directory
  const files = fs.readdirSync(dirPath);

  // Create an array to hold the nested list data
  const nestedList = [];

  // Iterate over each file/folder in the directory
  files.forEach(file => {
    // Construct the full path to the file/folder
    const filePath = path.join(dirPath, file);

    // Check if the item is a directory
    if (fs.statSync(filePath).isDirectory()) {
      // Recursively call this function to get the nested list of the subdirectory
      const subList = getNestedList(filePath);

      // Add the nested list data to the current item
      nestedList.push({ name: file, type: 'directory', items: subList });
    } else {
      // Add the file data to the current item
      nestedList.push({ name: file, type: 'file' });
    }
  });

  // Return the nested list data
  return nestedList;
}

// Start the server on port 3000
app.listen(3000, () => console.log('Server started on port 3000'));
```

This program defines a route `/list/:dir(*)` that takes a directory path as a parameter and returns a webpage with a nested list of files and folders in that directory. The `getNestedList()` function is used to recursively scan the directory and construct the nested list data. The EJS template `views/list.ejs` is used to render the webpage with the nested list data.

Note: This program assumes that the directory being scanned is a local directory on the server running the Node.js application. If you want to scan a directory on a remote server or from a client-side web application, you will need to modify the program accordingly.