Simple Node Tutorial

main-exp.js

const express = require('express');
const members = require('./Members');

// create application object
const app = express();
// 15 - body parser middleware to handle JSON
app.use(express.json());
// 15 - body parser middleware to handle URL encoded data
app.use(express.urlencoded( {extended: false}));

// create route handles
app.get('/', (req,res) => {
  res.send('<h1>Hello World Dome<h1>'); // send HTML
});

// 4 - get all members
app.get('/api/members', (req,res) => {
  res.json(members);  // return JSON, no need to stringify
});

// 8 - get single member
app.get('/api/members/:id', (req, res) => {
  //console.log(req.params.id);  // get a param
  
  // 12 - found id?
  const found = members.some(member => member.id === parseInt(req.params.id));
  if (!found) {
    // 12 - what to do when not found
    res.status(400).json({
      msg: `No member with id of ${req.params.id}`
    });
  } else {
    // 11
    //res.json(members.filter(member => member.id === req.params.id)); // id is string
    
    // 9 - arrow function with {} and 'return' statement
    // res.json(members.filter(member => {
    //   return member.id === parseInt(req.params.id);
    // }));

    // 10 - arrow function withno {} and 'return' and ';' 
    res.json(members.filter(member => 
      member.id === parseInt(req.params.id)
    ));
  }
});

// run with 'process.env.PORT' otherwise port 5000
const PORT = process.env.PORT || 5000;
app.listen(PORT, () => console.log(`Server started on port ${PORT}...`));

main.js

const { person, Person } = require('./person');      // import 'person.js'

console.log('Hello from Node.js...');
console.log(person);

const p1 = new Person('Dome Potikanond', 30);
p1.greeting();

Members.js

// 4 - Array of member objects
const members = [
  {
    id: 1,
    name: 'John Doe',
    email: '[email protected]',
    status: 'active'
  },
  {
    id: 2,
    name: 'Bob Williams',
    email: '[email protected]',
    status: 'inactive'
  },
  {
    id: 3,
    name: 'Shannon Jackson',
    email: '[email protected]',
    status: 'active'
  }
];

module.exports = members;

person.js

const person = {
  name: 'John Doe',
  age: 30
}

class Person {
  constructor(name, age) {
    this.name = name;
    this.age = age;
  }

  greeting() {
    console.log(`My name is ${this.name} (${this.age})`);
  }
}

module.exports = {person, Person}