📁 Day 10: Mini Project — Create a Local File Manager in Node.js

🎯 Project Goal

Create a CLI-based (Command Line Interface) File Manager that allows users to:

1. Create a folder

2. Create a file inside that folder

3. Read the file

4. Update the file

5. Delete the file or folder

All operations must include proper error handling.

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📦 Tools Used

• Node.js

• fs/promises module

• path module

• Basic knowledge of async/await and try...catch

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📁 Project Structure

local-file-manager/
└── fileManager.js  <-- All project logic here

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🛠 Step-by-Step Project Setup

✅ Step 1: Create the Project Folder

mkdir local-file-manager
cd local-file-manager

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✅ Step 2: Create fileManager.js

echo. > fileManager.js

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✏️ Step 3: Add Required Modules

// fileManager.js

const fs = require('fs').promises;
const path = require('path');

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✅ Step 4: Create Folder Function

async function createFolder(folderName) {
  try {
    const folderPath = path.join(__dirname, folderName);

    await fs.mkdir(folderPath);
    console.log(`✅ Folder '${folderName}' created successfully.`);
  } catch (err) {
    if (err.code === 'EEXIST') {
      console.error("❌ Folder already exists.");
    } else {
      console.error("❌ Failed to create folder:", err.message);
    }
  }
}

🔍 Explanation:

• mkdir() creates the folder

• path.join() ensures correct folder path

• Errors like “folder already exists” are caught using err.code

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✅ Step 5: Create File Inside Folder

async function createFile(folderName, fileName, content) {
  try {
    const filePath = path.join(__dirname, folderName, fileName);

    await fs.writeFile(filePath, content);
    console.log(`✅ File '${fileName}' created inside '${folderName}'.`);
  } catch (err) {
    console.error("❌ Error creating file:", err.message);
  }
}

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✅ Step 6: Read File Content

async function readFile(folderName, fileName) {
  try {
    const filePath = path.join(__dirname, folderName, fileName);
    const data = await fs.readFile(filePath, 'utf-8');
    console.log(`📄 File Content:\n${data}`);
  } catch (err) {
    console.error("❌ Error reading file:", err.message);
  }
}

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✅ Step 7: Update File Content

async function updateFile(folderName, fileName, newContent) {
  try {
    const filePath = path.join(__dirname, folderName, fileName);
    await fs.appendFile(filePath, `\n${newContent}`);
    console.log("✅ File updated successfully.");
  } catch (err) {
    console.error("❌ Error updating file:", err.message);
  }
}

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✅ Step 8: Delete File

async function deleteFile(folderName, fileName) {
  try {
    const filePath = path.join(__dirname, folderName, fileName);
    await fs.unlink(filePath);
    console.log("🗑️ File deleted successfully.");
  } catch (err) {
    console.error("❌ Error deleting file:", err.message);
  }
}

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✅ Step 9: Delete Folder

async function deleteFolder(folderName) {
  try {
    const folderPath = path.join(__dirname, folderName);
    await fs.rmdir(folderPath);
    console.log("🗑️ Folder deleted successfully.");
  } catch (err) {
    console.error("❌ Error deleting folder:", err.message);
  }
}

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🧪 Step 10: Call Functions to Test

// Call functions one by one to test

// 1. Create folder
createFolder("myNotes");

// 2. Create file
// createFile("myNotes", "note.txt", "This is my first note!");

// 3. Read file
// readFile("myNotes", "note.txt");

// 4. Update file
// updateFile("myNotes", "note.txt", "Adding one more line");

// 5. Delete file
// deleteFile("myNotes", "note.txt");

// 6. Delete folder
// deleteFolder("myNotes");

📝 Uncomment one function at a time to test it step by step.

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🧠 What Students Will Learn

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❓ Sample Errors & How We Handled Them

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💪 Suggested Student Tasks

1. Add a function to rename a file

2. List all files in a folder using fs.readdir()

3. Create a CLI interface using readline module

4. Add timestamps to file content on every update

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✅ Summary

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