Update server.js

server.js

@@ -1,74 +1,74 @@
-const express = require('express')
-const app = express()
-const MongoClient = require('mongodb').MongoClient
-const PORT = 2121
-require('dotenv').config()
+const express = require('express')//Loads express module
+const app = express()//Creates a faster-to-use variable for the above module
+const MongoClient = require('mongodb').MongoClient//Loads mongodb
+const PORT = 2121//Establishes listening port for server
+require('dotenv').config()//Allows for the .env file to be used for hidden data
 
-let db,
-    dbConnectionStr = process.env.DB_STRING,
-    dbName = 'todo'
+let db,//Declaring the variable for the database
+    dbConnectionStr = process.env.DB_STRING,//Assigning the string which contsins the login creds from the dotenv
+    dbName = 'todo'//Declaring the string that points to our database name
 
-MongoClient.connect(dbConnectionStr, {useUnifiedTopology: true})
-    .then(client => {
-        console.log(`Hey, connected to ${dbName} database`)
-        db = client.db(dbName)
+MongoClient.connect(dbConnectionStr, {useUnifiedTopology: true})//Tells the mongodb modules to use the .connect() method and connect with the database
+    .then(client => {//Upon fulfilling the promise
+        console.log(`Hey, connected to ${dbName} database`)//Print a succesful connection console log
+        db = client.db(dbName)//Assign the property of db of the client object with an argument of our database name to our db variable
     })
-    .catch(err =>{
-        console.log(err)
+    .catch(err =>{//unless an error has occurred
+        console.log(err)//then console log the error
     })
 
-app.set('view engine', 'ejs')
-app.use(express.static('public'))
-app.use(express.urlencoded({ extended: true }))
-app.use(express.json())
+app.set('view engine', 'ejs')//Sets express to use ejs to be viewed in the DOM
+app.use(express.static('public'))//Points to our public directory that will contain js and css files that the index.ejs will  link to and use
+app.use(express.urlencoded({extended: true}))//I DON'T KNOW
+app.use(express.json())//Tells express to format data in JSON objects
 
-app.get('/', async (req,res)=>{
-    const todoItems = await db.collection('todos').find().toArray()
-    const itemsLeft = await db.collection('todos').countDocuments({completed: false})
-    res.render('index.ejs', {zebra: todoItems, left: itemsLeft})
+app.get('/', async (req, res) => {//Get request to load the main
+    const todoItems = await db.collection('todos').find().toArray()//I don't really know... perhaps counting how many total todos there are, regardless of completion
+    const itemsLeft = await db.collection('todos').countDocuments({completed: false})//Counts how many todos have the completed property with a false value
+    res.render('index.ejs', {zebra: todoItems, left: itemsLeft})//Prints to the ejs file how many todos are left to complete
 })
 
-app.post('/createTodo', (req, res)=>{
-    db.collection('todos').insertOne({todo: req.body.todoItem, completed: false})
-    .then(result =>{
-        console.log('Todo has been added!')
-        res.redirect('/')
+app.post('/createTodo', (req, res)=>{//A POST method is used, connecting to the createTodo input
+    db.collection('todos').insertOne({todo: req.body.todoItem, completed: false})//Inserts the todoItem with a completed property of false into the database
+    .then(result =>{//After successfully inserting, 
+        console.log('Todo has been added!')//Print a success message to the console
+        res.redirect('/')//Direct the browser back to the base directory
     })
 })
 
-app.put('/markComplete', (req, res)=>{
-    db.collection('todos').updateOne({todo: req.body.rainbowUnicorn},{
-        $set: {
-            completed: true
+app.put('/markComplete', (req, res)=>{//A PUT method that changes individual todos from 'completed: false' to 'completed: true',
+    db.collection('todos').updateOne({todo: req.body.rainbowUnicorn},{//Updates the condition of one todo
+        $set: {//I dont know...
+            completed: true//sets the property of 'completed' to true
         }
     })
-    .then(result =>{
-        console.log('Marked Complete')
-        res.json('Marked Complete')
+    .then(result =>{//upon success
+        console.log('Marked Complete')//print a success msg in the console
+        res.json('Marked Complete')//I don't know what this does in regards to the JSON
     })
 })
 
-app.put('/undo', (req, res)=>{
-    db.collection('todos').updateOne({todo: req.body.rainbowUnicorn},{
-        $set: {
-            completed: false
+app.put('/undo', (req, res)=>{//A PUT method that changes the todos' 'completed: true' to 'completed: false'
+    db.collection('todos').updateOne({todo: req.body.rainbowUnicorn},{//Updates the condition of one todo
+        $set: {//I dont know...
+            completed: false//sets the property of 'completed' to false
         }
     })
-    .then(result =>{
-        console.log('Marked Complete')
-        res.json('Marked Complete')
+    .then(result =>{//upon success
+        console.log('Marked Complete')//print a success msg in the console
+        res.json('Marked Complete')//I don't know what this does in regards to the JSON
     })
 })
 
-app.delete('/deleteTodo', (req, res)=>{
-    db.collection('todos').deleteOne({todo:req.body.rainbowUnicorn})
-    .then(result =>{
-        console.log('Deleted Todo')
-        res.json('Deleted It')
+app.delete('/deleteTodo', (req, res)=>{//A DELETE method that will remove a todo from the database
+    db.collection('todos').deleteOne({todo:req.body.rainbowUnicorn})//selects and removes one todo object from the database
+    .then(result =>{//after successfully accomplishing the delete
+        console.log('Deleted Todo')//print a success msg to the console
+        res.json('Deleted It')//I don't know what this does in regards to the JSON
     })
-    .catch( err => console.log(err))
+    .catch( err => console.log(err))//Console log an error with its details if applicable
 })
 
-app.listen(process.env.PORT || PORT, ()=>{
-    console.log('Server is running, you better catch it!')
-})    
+app.listen(process.env.PORT || PORT, ()=>{//Sets the server's port to be connected to by a client.  With either the prefered (heroku, etc) port of the hard coded PORT variable value from above
+    console.log('Server is running, you better catch it!')//A silly message to let you know that the server is operational
+})