How To Check For One JSON Object Being Present In Another

I have two sets of data in a JSON (data.json) as below : UP = [{'password': 'jhonjhon', 'username':'jhon'}, {'password': 'juliejulie', 'username':'julie'}, {'password': 'blakeblak

Solution 1:

To check if password is same as in JSON by user, you have to loop that JSON array and check values:

for (var i = 0; i < UP.length; i++) {
   if (UP[i].username == x && UP[i].password == y) {
      for (var j = 0; j < Admins.length; j++) {
          if (Admin[i].Admin == x) {
             //It's correct logins, do something
          }
      }
   }
}

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SECURITY

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Never put passwords in user accessible location, always use back-end validation, always encode your passwords. Your approach is VERY VERY insecure. I always can check JSON source file and see what logins I can put to login as admin

Solution 2:

Your should loop through the JSON object and check the uid is present or not.

adminFlag will set to true if the x is present in Admins.

Try the code given below:

function finalCheck(){
    var adminJSON = JSON.parse(Admins), // since Admins is string, parse to Json first
        length = adminJSON.length,
        x = document.forms["myForm"]["uid"].value,
        y = document.forms["myForm"]["pwd"].value,
        adminFlag = false;

        // for loop to find admin is present or not
        for(var i = 0; i < length; i++){
            if(adminJSON[i].Admin == x){
               adminFlag = true;
               break;
            }
        }
}

Solution 3:

I suppose that this task is for a learning purpose. Please never do this in production. You could play with this sample code. There are a lot of smarter solutions but in my opinion this would help you to understand the basics.

var UP = [{"password": "jhonjhon", "username":"jhon"}, {"password": "juliejulie", "username":"julie"}, {"password": "blakeblake", "username":"blake"}];
var ADMINS = [{"Admin":"jhon"}, {"Admin":"julie"}];

function finalcheck()
{
 var x = 'jhon';
 var y = 'jhonjhon';

 for(var i = 0; i < UP.length; i++)
 {
   if (UP[i].password == x && UP[i].username == y)
   {
     console.log(y + ' has access!');
     for (var j = 0; j < ADMINS.length; j++) {
       if (ADMINS[j].Admin == y)
       {
         console.log(y + ' is Admin');
       }
     }
   } 
 }
}