Getting ajax request response node.js

Question

I have a html page that triggers an ajax request:

$.ajax({
                type: 'POST',
                url: '/usernamecheck',
                data: {"username":username},
                success: function(taken){
                    if(taken === 0){
                        $('#error').text('The username' + username + ' is available!')
                    }else{
                        $('#error').text('The username' + username + ' is not available')
                    }
                },
                dataType: "json"
            })

this is my node.js code:

exports.usernameCheck = function(req,res){
var db;
db = require('./../custom_modules/db.js');
var username = req.body.username;
db.users.find({username:username},function(err,users){

    console.log(username)
    if(users.length === 0){
        //return 0
    }else{
        //return1
    }
})

and I want to respond to this ajax with node.js request but am a little unsure of how to do so?

Answer 1

The jQuery ajax dataType represents the data your're expecting back from the server. I would leave this as json and just change other parts of your code to accommodate the data type.

Client

$.ajax({
  type: 'POST',
  url: '/usernamecheck',
  data: {"username":username},
  success: function(response){
    if( response.taken === true){
      $('#error').text('The username' + username + ' is available!')
    }else{
      $('#error').text('The username' + username + ' is not available')
    }
  },
  dataType: "json"
})

Node

db.users.find({username:username},function(err,users){
  res.json({taken: users.length !== 0})
})