Todo Api Endpoints

backend/index.js

@@ -1,11 +1,10 @@
 const express = require("express");
 const app = express();
 const PORT = process.env.PORT || 4000;
+const todosRouter = require('./routes/todos');
 
-// Basic route
-app.get("/", (req, res) => {
-  res.send("Hello from Express!");
-});
+app.use(express.json());
+app.use('/api/todos', todosRouter);
 
 // Start server
 app.listen(PORT, () => {

backend/models/todo.js

@@ -0,0 +1,38 @@
+let todos = [];
+let nextId = 1;
+
+function getAllTodos() {
+    return todos;
+}
+
+function getTodoById(id) {
+    return todos.find(t => t.id === id);
+}
+
+function createTodo(title) {
+    const todo = { id: nextId++, title, completed: false, createdAt: new Date().toISOString() };
+    todos.push(todo);
+    return todo;
+}
+
+function updateTodo(id, data) {
+    const todo = todos.find(t => t.id === id);
+    if (!todo) return null;
+    if (data.title !== undefined) todo.title = data.title;
+    if (data.completed !== undefined) todo.completed = data.completed;
+    return todo;
+}
+
+function deleteTodo(id) {
+    const index = todos.findIndex(t => t.id === id);
+    if (index === -1) return null;
+    return todos.splice(index, 1)[0];
+}
+
+module.exports = {
+    getAllTodos,
+    getTodoById,
+    createTodo,
+    updateTodo,
+    deleteTodo
+};

backend/package.json

@@ -5,6 +5,7 @@
     "start": "node index.js"
   },
   "dependencies": {
-    "express": "^4.18.2"
+    "body-parser": "^1.20.3",
+    "express": "^4.22.1"
   }
 }

backend/routes/todos.js

@@ -0,0 +1,34 @@
+const express = require('express');
+const router = express.Router();
+const Todo = require('../models/todo');
+
+router.get('/', (req, res) => {
+    res.json(Todo.getAllTodos());
+});
+
+router.get('/:id', (req, res) => {
+    const todo = Todo.getTodoById(parseInt(req.params.id));
+    if (!todo) return res.status(404).json({ error: 'Todo not found' });
+    res.json(todo);
+});
+
+router.post('/', (req, res) => {
+    const { title } = req.body;
+    if (!title || typeof title !== 'string') return res.status(400).json({ error: 'Title required' });
+    const newTodo = Todo.createTodo(title);
+    res.status(201).json(newTodo);
+});
+
+router.put('/:id', (req, res) => {
+    const updated = Todo.updateTodo(parseInt(req.params.id), req.body);
+    if (!updated) return res.status(404).json({ error: 'Todo not found' });
+    res.json(updated);
+});
+
+router.delete('/:id', (req, res) => {
+    const deleted = Todo.deleteTodo(parseInt(req.params.id));
+    if (!deleted) return res.status(404).json({ error: 'Todo not found' });
+    res.json(deleted);
+});
+
+module.exports = router;