CLI Task Manager

This project will use Mongoose for database operations, and we''ll parse command-line arguments to handle different commands. It''s a perfect real-world example of MongoDB in action!

mkdir task-manager-cli
cd task-manager-cli
npm init -y
npm install mongoose dotenv

MONGODB_URI=mongodb://localhost:27017/task-manager

const mongoose = require('mongoose');

const taskSchema = new mongoose.Schema({
  title: {
    type: String,
    required: [true, 'Task title is required'],
    trim: true
  },
  description: {
    type: String,
    trim: true
  },
  completed: {
    type: Boolean,
    default: false
  },
  createdAt: {
    type: Date,
    default: Date.now
  }
});

module.exports = mongoose.model('Task', taskSchema);

require('dotenv').config();
const mongoose = require('mongoose');

const connectDB = async () => {
  try {
    await mongoose.connect(process.env.MONGODB_URI);
    console.log('Connected to MongoDB');
  } catch (err) {
    console.error('Database connection error:', err);
    process.exit(1);
  }
};

module.exports = connectDB;

require('dotenv').config();
const connectDB = require('./db');
const Task = require('./models/Task');

<!-- Get command and arguments -->
const command = process.argv[2];
const args = process.argv.slice(3);

<!-- Helper to display tasks -->
function displayTask(task) {
  const status = task.completed ?  : ;
  console.log(`${status} [${task._id}] ${task.title}`);
  if (task.description) {
    console.log(`   Description: ${task.description}`);
  }
}

<!-- Main function -->
async function run() {
  await connectDB();
  
  switch (command) {
    case 'add':
      await addTask();
      break;
    case 'list':
      await listTasks();
      break;
    case 'complete':
      await completeTask();
      break;
    case 'delete':
      await deleteTask();
      break;
    default:
      console.log('Usage: node app.js  [arguments]');
      console.log('Commands:');
      console.log('  add "title" "description" - Add a new task');
      console.log('  list - List all tasks');
      console.log('  complete  - Mark task as complete');
      console.log('  delete  - Delete a task');
      process.exit(1);
  }
  
  <!-- Close MongoDB connection -->
  await mongoose.connection.close();
  process.exit(0);
}

<!-- Add Task Function -->
async function addTask() {
  if (args.length < 1) {
    console.log('Please provide a task title');
    return;
  }
  
  const title = args[0];
  const description = args[1] || '';
  
  try {
    const task = new Task({ title, description });
    await task.save();
    console.log('Task added successfully!');
    displayTask(task);
  } catch (err) {
    console.error('Error adding task:', err.message);
  }
}

<!-- List Tasks Function -->
async function listTasks() {
  try {
    const tasks = await Task.find().sort({ createdAt: -1 });
    
    if (tasks.length === 0) {
      console.log('No tasks found.');
      return;
    }
    
    console.log('n📋 Your Tasks:n');
    tasks.forEach(task => displayTask(task));
  } catch (err) {
    console.error('Error listing tasks:', err);
  }
}

<!-- Complete Task Function -->
async function completeTask() {
  if (args.length === 0) {
    console.log('Please provide a task ID');
    return;
  }
  
  const taskId = args[0];
  
  try {
    const task = await Task.findByIdAndUpdate(
      taskId,
      { completed: true },
      { new: true }
    );
    
    if (!task) {
      console.log('Task not found');
      return;
    }
    
    console.log('Task marked as complete!');
    displayTask(task);
  } catch (err) {
    console.error('Error completing task:', err.message);
  }
}

<!-- Delete Task Function -->
async function deleteTask() {
  if (args.length === 0) {
    console.log('Please provide a task ID');
    return;
  }
  
  const taskId = args[0];
  
  try {
    const task = await Task.findByIdAndDelete(taskId);
    
    if (!task) {
      console.log('Task not found');
      return;
    }
    
    console.log('Task deleted successfully!');
  } catch (err) {
    console.error('Error deleting task:', err.message);
  }
}

<!-- Start the app -->
run();