index.js

// Import the Express using require() module
const express = require('express');

// Initalize express app
const app = express();

// Lets create Fake Data for api
const userData = [
  {
    id: 1,
    name: 'Jhon',
    age: 20
  },
  {
    id: 2,
    name: 'Jane',
    age: 23
  },
  {
    id: 3,
    name: 'Tim',
    age: 34
  },
];

// Create Endpoints for API

// Endpoint 1
app.get('/api', function(req, res){
  res.send('Welcome to our API')
})

// Endpoint 2
app.get('/api/users', function(req, res){
  res.json(userData);
})

// Endpoint 3
app.get('/api/user/:id', function(req, res){
  const id = req.params.id;
  const user = userData.find(user => user.id == id);

  if (user) {
    res.json(user)
  }
  else {
    res.send('No User Found')
  }
})

// Start the Server
const PORT = 3000;
app.listen(PORT, function(){
  console.log('Server Started')
})