What is the best way to verify that a JSON key contains only distinct values within a JSON document using JavaScript?

Question

What is the best way to verify that a JSON key contains only distinct values within a JSON document using JavaScript?

I'm working with a JSON file structure that looks something like this:

"fields": {
"asset": {
    "values": [{
            "asset": {
                "id": "Info_text",
                "type": "text",
                "value": "ABCD"
            }
        }, 
        {
            "asset": {
            "id": "Info_input",
            "type": "input",
            "value": "ABCDE"
            }
        }
    ]
}
}

My task is to write JavaScript code that will iterate over the values of the "id" field and check if they are unique. Can someone help me figure out how to achieve this?

javascript json

Answer 1

Answer №1

Check out this demonstration that doesn't require any additional libraries. It shows how you can determine if a key/value pair is unique in a JSON object and find the number of occurrences:

var jsonData = {
  "fields": [
    {
      "asset": {
        "id": "Info_input",
        "values": [
          {
            "asset": {
              "id": "Info_text",
              "type": "text",
              "value": "ABCD"
            }
          },
          {
            "asset": {
              "id": "Info_input",
              "type": "input",
              "value": "ABCDE"
            }
          },
          {
            "asset": {
              "id": "Info_input",
              "type": "input",
              "value": "ABCDE"
            }
          }
        ]
      }
    }
  ]
}

function countKeyValue(key, value, obj) {
var total = 0;
var keys = Object.keys(obj);
keys.forEach(function(k) {
var v = obj[k];
if(typeof v === 'object') {
total += countKeyValue(key, value, v)
}
else if(k === key && v === value) {
total += 1;
}
});
return total;
}

function checkUniqueness(key, value, obj) {
return countKeyValue(key, value, obj) === 1;
}


console.log(countKeyValue('id', 'Info_text', jsonData));
// -> 1

console.log(countKeyValue('id', 'Info_input', jsonData));
// -> 3

console.log(countKeyValue('value', 'ABCDE', jsonData));
// -> 2

console.log(countKeyValue('xxx', 'yyy', jsonData));
// -> 0

console.log(checkUniqueness('id', 'Info_input', jsonData));
// -> false

console.log(checkUniqueness('id', 'Info_text', jsonData));
// -> true

Enjoy exploring!

Answer 2

Check out this demonstration that doesn't require any additional libraries. It shows how you can determine if a key/value pair is unique in a JSON object and find the number of occurrences:

var jsonData = {
  "fields": [
    {
      "asset": {
        "id": "Info_input",
        "values": [
          {
            "asset": {
              "id": "Info_text",
              "type": "text",
              "value": "ABCD"
            }
          },
          {
            "asset": {
              "id": "Info_input",
              "type": "input",
              "value": "ABCDE"
            }
          },
          {
            "asset": {
              "id": "Info_input",
              "type": "input",
              "value": "ABCDE"
            }
          }
        ]
      }
    }
  ]
}

function countKeyValue(key, value, obj) {
var total = 0;
var keys = Object.keys(obj);
keys.forEach(function(k) {
var v = obj[k];
if(typeof v === 'object') {
total += countKeyValue(key, value, v)
}
else if(k === key && v === value) {
total += 1;
}
});
return total;
}

function checkUniqueness(key, value, obj) {
return countKeyValue(key, value, obj) === 1;
}


console.log(countKeyValue('id', 'Info_text', jsonData));
// -> 1

console.log(countKeyValue('id', 'Info_input', jsonData));
// -> 3

console.log(countKeyValue('value', 'ABCDE', jsonData));
// -> 2

console.log(countKeyValue('xxx', 'yyy', jsonData));
// -> 0

console.log(checkUniqueness('id', 'Info_input', jsonData));
// -> false

console.log(checkUniqueness('id', 'Info_text', jsonData));
// -> true

Enjoy exploring!

What is the best way to verify that a JSON key contains only distinct values within a JSON document using JavaScript?

Answer №1

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