build any app using node js

a simple to-do list app built with Node.js and Express. Users can add and delete tasks, and the tasks are saved in a JSON file. This is a basic example that can be expanded with more features.

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Todo App</title>
    <style>
        body { font-family: Arial, sans-serif; }
        .todo { margin: 5px 0; }
    </style>
</head>
<body>
    <h1>Todo List</h1>
    <input id="taskInput" type="text" placeholder="New task">
    <button onclick="addTodo()">Add Todo</button>
    <div id="todoList"></div>

    <script>
        async function fetchTodos() {
            const response = await fetch('/api/todos');
            const todos = await response.json();
            const todoList = document.getElementById('todoList');
            todoList.innerHTML = '';
            todos.forEach(todo => {
                const todoDiv = document.createElement('div');
                todoDiv.classList.add('todo');
                todoDiv.innerHTML = `${todo.task} <button onclick="deleteTodo(${todo.id})">Delete</button>`;
                todoList.appendChild(todoDiv);
            });
        }

        async function addTodo() {
            const taskInput = document.getElementById('taskInput');
            const task = taskInput.value;
            if (!task) return;

            await fetch('/api/todos', {
                method: 'POST',
                headers: {
                    'Content-Type': 'application/json',
                },
                body: JSON.stringify({ task }),
            });
            taskInput.value = '';
            fetchTodos();
        }

        async function deleteTodo(id) {
            await fetch(`/api/todos/${id}`, {
                method: 'DELETE',
            });
            fetchTodos();
        }

        fetchTodos();
    </script>
</body>
</html>

body {
       font-family: Arial, sans-serif;
       background-color: #f4f4f9;
       color: #333;
       margin: 0;
       padding: 20px;
       display: flex;
       flex-direction: column;
       align-items: center;
   }

   h1 {
       color: #4a4a4a;
   }

   #taskInput {
       width: 300px;
       padding: 10px;
       border: 2px solid #4a90e2;
       border-radius: 4px;
       margin-right: 10px;
       outline: none;
       transition: border-color 0.3s;
   }

   #taskInput:focus {
       border-color: #007bff;
   }

   button {
       padding: 10px 15px;
       background-color: #4a90e2;
       border: none;
       border-radius: 4px;
       color: white;
       cursor: pointer;
       transition: background-color 0.3s;
   }

   button:hover {
       background-color: #007bff;
   }

   #todoList {
       margin-top: 20px;
       width: 100%;
       max-width: 400px;
   }

   .todo {
       background: white;
       padding: 10px;
       margin: 5px 0;
       border-radius: 4px;
       box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
       display: flex;
       justify-content: space-between;
       align-items: center;
   }

   .todo button {
       background-color: #e74c3c;
       padding: 5px 10px;
       border: none;
       border-radius: 4px;
       color: white;
       cursor: pointer;
       transition: background-color 0.3s;
   }

   .todo button:hover {
       background-color: #c0392b;
   }

const express = require('express');
const bodyParser = require('body-parser');
const fs = require('fs');
const path = require('path');

const app = express();
const PORT = 3000;

app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: true }));

const dataFilePath = path.join(__dirname, 'todos.json');

// Load existing todos or initialize an empty array
let todos = [];
if (fs.existsSync(dataFilePath)) {
  const data = fs.readFileSync(dataFilePath);
  todos = JSON.parse(data);
}

// Get all todos
app.get('/api/todos', (req, res) => {
  res.json(todos);
});

// Add a new todo
app.post('/api/todos', (req, res) => {
  const newTodo = {
    id: Date.now(),
    task: req.body.task,
  };
  todos.push(newTodo);
  fs.writeFileSync(dataFilePath, JSON.stringify(todos));
  res.status(201).json(newTodo);
});

// Delete a todo by ID
app.delete('/api/todos/:id', (req, res) => {
  todos = todos.filter(todo => todo.id !== parseInt(req.params.id));
  fs.writeFileSync(dataFilePath, JSON.stringify(todos));
  res.status(204).send();
});

// Start the server
app.listen(PORT, () => {
  console.log(`Server is running on http://localhost:${PORT}`);
});

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