🔌 Build a REST API with Node.js and Express

Write server.js with all four CRUD routes.

const express = require('express');
const app = express();
app.use(express.json());

let tasks = [];
let nextId = 1;

// GET all tasks
app.get('/tasks', (req, res) => {
  res.json(tasks);
});

// GET single task
app.get('/tasks/:id', (req, res) => {
  const task = tasks.find(t => t.id === +req.params.id);
  if (!task) return res.status(404).json({ error: 'Not found' });
  res.json(task);
});

// POST create task
app.post('/tasks', (req, res) => {
  const { title } = req.body;
  if (!title) return res.status(400).json({ error: 'Title is required' });
  const task = { id: nextId++, title, done: false };
  tasks.push(task);
  res.status(201).json(task);
});

// PUT update task
app.put('/tasks/:id', (req, res) => {
  const task = tasks.find(t => t.id === +req.params.id);
  if (!task) return res.status(404).json({ error: 'Not found' });
  Object.assign(task, req.body);
  res.json(task);
});

// DELETE task
app.delete('/tasks/:id', (req, res) => {
  tasks = tasks.filter(t => t.id !== +req.params.id);
  res.status(204).send();
});

app.listen(3000, () => console.log('API running on http://localhost:3000'));

# Create a task
curl -X POST http://localhost:3000/tasks \
  -H "Content-Type: application/json" \
  -d '{"title":"Learn Express"}'

# List all tasks
curl http://localhost:3000/tasks

# Mark done
curl -X PUT http://localhost:3000/tasks/1 \
  -H "Content-Type: application/json" \
  -d '{"done":true}'

# Delete
curl -X DELETE http://localhost:3000/tasks/1

{"id":1,"title":"Learn Express","done":false}
[{"id":1,"title":"Learn Express","done":false}]
{"id":1,"title":"Learn Express","done":true}