REST API बनवणे

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

// In-memory database
let students = [
  { id: 1, name: "Avadhoot", grade: "A" },
  { id: 2, name: "Rahul", grade: "B" },
];
let nextId = 3;

// GET /students — सगळे students मिळवा
app.get('/students', (req, res) => {
  res.json(students);
});

// GET /students/:id — specific student
app.get('/students/:id', (req, res) => {
  const student = students.find(s => s.id === Number(req.params.id));
  if (!student) return res.status(404).json({ error: 'Student not found' });
  res.json(student);
});

// POST /students — नवीन student add करा
app.post('/students', (req, res) => {
  const { name, grade } = req.body;
  if (!name || !grade) return res.status(400).json({ error: 'name और grade required' });
  const newStudent = { id: nextId++, name, grade };
  students.push(newStudent);
  res.status(201).json(newStudent);
});

// PUT /students/:id — student update करा
app.put('/students/:id', (req, res) => {
  const idx = students.findIndex(s => s.id === Number(req.params.id));
  if (idx === -1) return res.status(404).json({ error: 'Not found' });
  students[idx] = { ...students[idx], ...req.body };
  res.json(students[idx]);
});

// DELETE /students/:id — student delete करा
app.delete('/students/:id', (req, res) => {
  const idx = students.findIndex(s => s.id === Number(req.params.id));
  if (idx === -1) return res.status(404).json({ error: 'Not found' });
  const deleted = students.splice(idx, 1);
  res.json({ deleted: deleted[0] });
});

app.listen(3000, () => console.log('Server running on port 3000'));