todos-server.js

// package.json

{
  "name": "todo-api",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "start": "nodemon todos.js"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "dependencies": {
    "dvali": "^0.2.7",
    "express": "^4.18.1",
    "nodemon": "^2.0.16",
    "uuid": "^8.3.2"
  }
}


// server.js

const express = require('express')
const { v4: uuid } = require('uuid')
const { validate, isString, minLength, isBool } = require('dvali')

const app = express()

const port = 4444

// Todo
// - ID: UUID
// - Name: String
// - Completed: Boolean

const validateName = validate([ isString(), minLength(3) ])

let Todos = []

app.use(express.json())

app.get('/todos', (req, res) => {
    res.json(Todos)
})

app.post('/todos', async (req, res) => {
    try {
        const { name } = req.body
        const validatedName = await validateName(name)
        const todo = { 
            id: uuid(), 
            name: validatedName, 
            completed: false 
        }
        Todos = [...Todos, todo]
        res.sendStatus(201)
    } catch (err) {
        console.log(err)
        res.status(422).json({
            message: err
        })
    }
})

app.get('/todos/:id', (req, res) => {
    const id = req.params.id
    const founds = Todos.filter(todo => todo.id === id)
    if (founds.length === 0) {
        res.sendStatus(404)
        return
    }
    res.json(founds[0])
})

app.delete('/todos/:id', (req, res) => {
    const id = req.params.id
    Todos = Todos.filter(todo => todo.id !== id)
    res.sendStatus(204)
})

const validateCompleted = validate([ isBool() ])

const validateUpdateTodo = validate({
    name: validateName,
    completed: validateCompleted
})

app.put('/todos/:id', async (req, res) => {
    const id = req.params.id
    const founds = Todos.filter(todo => todo.id === id)
    if (founds.length === 0) {
        res.sendStatus(404)
        return
    }
    const newState = Todos.filter(todo => todo.id !== id)
    const { name, completed } = req.body
    try {
        const update = { name, completed }
        const validated = await validateUpdateTodo(update)
        const newTodo = { ...founds[0], ...validated }
        Todos = [...newState, newTodo ]
        res.sendStatus(204)
    } catch (err) {
        console.log(err)
        console.log(err.toString())
        res.status(422).json({
            message: err
        })
    }
}) 

app.listen(port, () => {
    console.log(`server started at http://localhost:${port}`)
})