index.js

const express = require('express')
const app = express()
require('dotenv').config()
const bodyParser = require('body-parser')

const Note = require('./models/note')

app.use(bodyParser.json())
const cors = require('cors')

app.use(cors())

const requestLogger = (request, response, next) => {
  console.log('Method:', request.method)
  console.log('Path:  ', request.path)
  console.log('Body:  ', request.body)
  console.log('---')
  next()
}

app.use(requestLogger)

let notes = [
  {
    id: 1,
    content: "HTML is easy",
    date: "2019-05-30T17:30:31.098Z",
    important: true
  },
  {
    id: 2,
    content: "Browser can execute only Javascript",
    date: "2019-05-30T18:39:34.091Z",
    important: false
  },
  {
    id: 3,
    content: "GET and POST are the most important methods of HTTP protocol",
    date: "2019-05-30T19:20:14.298Z",
    important: true
  }
]

app.use(express.static('build'))

app.get('/', (req, res) => {
  res.send('<h1>Hello World!</h1>')
})

app.post('/api/notes', (request, response, next) => {
  const body = request.body

  const note = new Note({
    content: body.content, 
    important: body.important || false,
    date: new Date(),
  })

  note
    .save()
    .then(savedNote => savedNote.toJSON())
    .then(savedAndFormattedNote => {
      response.json(savedAndFormattedNote)
    })
    .catch(error => next(error))
}) 

app.get('/api/notes', (request, response) => {
  Note.find({}).then(notes => {
    response.json(notes)
  })
})

app.get('/api/notes/:id', (request, response, next) => {
  Note.findById(request.params.id)
    .then(note => {
      if (note) {
        response.json(note.toJSON())
      } else {
        response.status(204).end()
      }
    })
    .catch(error => next(error))
})

app.put('/api/notes/:id', (request, response, next) => {
  const body = request.body

  const note = {
    content: body.content,
    important: body.important,
  }

  Note.findByIdAndUpdate(request.params.id, note, { new: true })
    .then(updatedNote => {
      response.json(updatedNote.toJSON())
    })
    .catch(error => next(error))
})

app.delete('/api/notes/:id', (request, response, next) => {
  Note.findByIdAndRemove(request.params.id)
    .then(result => {
      response.status(204).end()
    })
    .catch(error => next(error))
})

const unknownEndpoint = (request, response) => {
  response.status(404).send({ error: 'unknown endpoint' })
}

app.use(unknownEndpoint)

const errorHandler = (error, request, response, next) => {
  console.error(error.message)

  if (error.name === 'CastError' && error.kind == 'ObjectId') {
    return response.status(400).send({ error: 'malformatted id' })
  } else if (error.name === 'ValidationError') {
    return response.status(400).json({ error: error.message })
  }
  next(error)
}

app.use(errorHandler)

const PORT = process.env.PORT 

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