index.js

const express = require('express')
const morgan = require('morgan')
const app = express()
const cors = require('cors')
app.use(cors())
app.use(express.static('dist'))
app.use(express.json())

morgan.token('req-body', (req) => {
    if (req.method === 'POST') {
      return JSON.stringify(req.body);
    }
    return ''; 
  });
  
app.use(
    morgan(':method :url :status - :response-time ms :req-body', {
      stream: process.stdout,
    })
  );

let persons = [
    { 
        "id": 1,
        "name": "Arto Hellas", 
        "number": "040-123456"
      },
      { 
        "id": 2,
        "name": "Ada Lovelace", 
        "number": "39-44-5323523"
      },
      { 
        "id": 3,
        "name": "Dan Abramov", 
        "number": "12-43-234345"
      },
      { 
        "id": 4,
        "name": "Mary Poppendieck", 
        "number": "39-23-6423122"
      }
]

app.get('/', (req, res) => {
    res.send('<h1>Person Data</h1>')
})

app.get('/api/persons', (req, res) => {
    res.json(persons)
})

app.get('/info', (req, res) => {
    const requestTime = new Date();

    res.send(`
    <div>
      <p>Phonebook has info for ${persons.length} people</p>
      <p>${requestTime}</p>
    </div>
    `)
})

app.get('/api/persons/:id', (req, res) => {
    const id = Number(req.params.id)
    const person = persons.find(person => person.id === id)

    if (person) {
        res.json(person)
    } else {
        res.status(404).end()
    }
})

app.delete('/api/persons/:id', (req, res) => {
    const id = Number(req.params.id)
    persons = persons.filter(person => person.id !== id)

    res.status(204).end()
})

app.post('/api/persons', (req, res) => {
    const body = req.body

    if (!body.name || !body.number) {
        return res.status(404).json({
            error: 'information missing'
        })
    }

    const names = persons.map(person => person.name)

    if(names.includes(body.name)){
        return res.status(404).json({
            error: 'name must be unique'
        })
    }

    const person = {
        id: Math.floor(Math.random() * 10000000000),
        name:body.name,
        number:body.number,
    }

    persons = persons.concat(person)

    res.json(person)
})

const PORT = 3001
app.listen(PORT, () => {
    console.log(`Server running on port ${PORT}`)
})