app.js

const express = require("express");
const bodyParser = require("body-parser");
const mongoose = require("mongoose");
const cors = require("cors");

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

mongoose.connect(MONGODB_URI, {
  useNewUrlParser: true,
  useUnifiedTopology: true,
});

// Define User schema
const userSchema = new mongoose.Schema({
  firstName: String,
  lastName: String,
  dob: Date,
});

const User = mongoose.model("User", userSchema);

// Parse incoming JSON requests
app.use(bodyParser.json());
app.use(cors());

// Handle GET request for all users
app.get("/users", async (req, res) => {
  try {
    const users = await User.find();
    res.json(users);
  } catch (error) {
    res.status(500).json({ error: error.message });
  }
});

// Handle GET request for one user
app.get("/users/:id", async (req, res) => {
  try {
    const user = await User.findById(req.params.id);
    res.json(user);
  } catch (error) {
    res.status(500).json({ error: error.message });
  }
});

// Handle POST request to create a new user
app.post("/users", async (req, res) => {
  try {
    const user = new User(req.body);
    await user.save();
    res.json(user);
  } catch (error) {
    res.status(500).json({ error: error.message });
  }
});

// Handle PUT request to update an existing user
app.put("/users/:id", async (req, res) => {
  try {
    const user = await User.findById(req.params.id);
    user.set(req.body);
    await user.save();
    res.json(user);
  } catch (error) {
    res.status(500).json({ error: error.message });
  }
});

// Handle DELETE request to delete an existing user
app.delete("/users/:id", async (req, res) => {
  try {
    const user = await User.findByIdAndDelete(req.params.id);
    res.json(user);
  } catch (error) {
    res.status(500).json({ error: error.message });
  }
});

// Start the server
app.listen(PORT, () => {
  console.log(`Server listening on port ${PORT}`);
});