🗂️ Task Manager (Node.js Beginner Assessment)

A simple CLI-based and HTTP-based Task Manager built with Node.js, designed to help beginners understand core Node.js concepts including modules, file system operations, JSON handling, and server creation.

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🚀 Project Overview

This project tests your understanding of:

• Node.js Modules (built-in and custom)

• File System operations (read/write)

• JSON data manipulation

• Creating a basic HTTP server

• Command-line interactions

• Error handling

• Using package.json

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🧱 Project Structure

task-manager/
├── package.json # Project metadata and dependencies
├── app.js # Main CLI & server logic
├── taskManager.js # Custom module for task operations
└── tasks.json # Task data storage (as JSON)

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🛠️ Setup Instructions

1. Clone the repository or create the project directory

2. Initialize Node.js:

   npm init -y

3. Create the file structure as shown above.

4. Run the application using:

   node app.js [command]

🧩 Features

• addTask(title, description) – Add a new task

• getAllTasks() – Get all tasks

• markTaskComplete(taskId) – Mark a task as completed

• deleteTask(taskId) – Delete a task by ID

• saveTasksToFile() – Save tasks to tasks.json

• loadTasksFromFile() – Load tasks from tasks.json

📋 Task Object Structure

{
  "id": 1,
  "title": "Learn Node.js",
  "description": "Complete the beginner tutorial",
  "completed": false,
  "createdAt": "2025-05-27T10:30:00.000Z"
}

💻 Command-Line Usage

# Add a new task
node app.js add "Buy groceries" "Milk, bread, eggs"

# List all tasks
node app.js list

# Mark a task as completed
node app.js complete 1

# Delete a task
node app.js delete 2

# Start HTTP server
node app.js server

🌐 HTTP Server Usage

When you run:

node app.js server

The server starts on http://localhost:3000 with the following endpoints:

Method	Endpoint	Description
GET	/	Welcome message
GET	/tasks	Retrieve all tasks (JSON)
POST	/tasks	Add a new task (JSON body)

🧪 Sample Output

✅ Task Added

✓ Task added successfully!
ID: 1, Title: "Buy groceries"

📄 Task List

=== Your Tasks ===

[1] Buy groceries (Pending)
    Description: Milk, bread, eggs
    Created: 2025-05-27 10:30 AM

[2] Learn Node.js (Completed ✓)
    Description: Complete the beginner tutorial
    Created: 2025-05-27 09:15 AM

⚠️ Error Handling

The application handles:

• File read/write errors

• Missing/invalid command arguments

• Non-existent task IDs

• Malformed JSON data

• Server and route errors

📚 Learning Objectives Recap

• ✅ Node.js module system

• ✅ JSON file storage and manipulation

• ✅ File system read/write operations

• ✅ Building a CLI-based app with process.argv

• ✅ Creating a basic HTTP server with http module

• ✅ Writing reusable and testable code with validation and error handling

🧑‍💻 Author

This project is part of a beginner assessment for learning Node.js and understanding how to build real-world CLI and server-based applications.

📄 License

This project is open for learning purposes. Feel free to use and modify for educational goals.