Discovering necessary information by iterating through JSON

Being new to vue js, my goal is to loop through the provided JSON data and check if the required data is present within the file. Here is a snippet of the JSON:

[
{
    "id": "text-5",
    "widget": "hello",
    "params": {
        "0": "section-right",
        "name": "Right",
        "id": "section",
        "description": "",
        "class": "",
        "after_title": "",
        "widget_id": "text-5"
    },
    "instance": {
        "title": "St",
        "text": "",
        "filter": false,
        "sidebar": "se-right",
        "sidebar-order": 0,
        "inherited": "yes",
        "number": 0
    }
},
{
    "id": "text-5",
    "widget": "hello",
    "params": {
        "0": "section-right",
        "name": "Right",
        "id": "section",
        "description": "",
        "class": "",
        "after_title": "",
        "widget_id": "text-5"
    },
    "instance": {
        "title": "Twitter Feed",
        "twitteruser": "Stei",
        "sidebar": "sectht",
        "sidebar-order": "4"
    }
}]

My objective is to iterate over the data and identify if the key "instance" contains the value twitteruser.

This is the code I attempted:

const data = JSON.parse(res).data
console.log(data[0].instance)
javascriptjson

Answer №1

In case your data is an array that has been parsed from your JSON, you have the option to implement the following:

var filtered = data.filter(function(item) {
   return item.instance && item.instance.twitteruser  
})

The variable filtered will represent a new array that only includes elements with a twitteruser

If you are simply interested in determining its existence, you can check the length of filtered

if (filtered.length > 0) {
   // perform certain actions
}

Answer №2

One possible method of iteration is shown below:


    <script>
    var json_data = [
    {
        "id": "text-7",
        "widget": "hi",
        "params": {
            "0": "section-left",
            "name": "Left",
            "id": "area",
            "description": "",
            "class": "",
            "after_title": "",
            "widget_id": "text-7"
        },
        "instance": {
            "title": "Hello",
            "text": "",
            "filter": false,
            "sidebar": "se-left",
            "sidebar-order": 0,
            "inherited": "no",
            "number": 3
        }
    },
    {
        "id": "text-8",
        "widget": "greetings",
        "params": {
            "0": "section-right",
            "name": "Right",
            "id": "box",
            "description": "",
            "class": "",
            "after_title": "",
            "widget_id": "text-8"
        },
        "instance": {
            "title": "Twitter",
            "twitteruser": "JoeDoe",
            "sidebar": "sectht",
            "sidebar-order": "4"
        }
    }];

    for( var j = 0; j < json_data.length; j++) {

        if(typeof json_data[j].instance == 'object' && typeof json_data[j].instance.twitteruser != 'undefined'){
            console.log(json_data[j].instance.twitteruser);
        }

    }
    
    </script>

Answer №3

It seems like you have an array of objects, each containing another object under the instance key. Your goal is to determine if any of these instance objects include the key twitteruser. To achieve this, simply implement a for loop and verify:

const data = [{
    "id": "text-5",
    "widget": "hello",
    "params": {
      "0": "section-right",
      "name": "Right",
      "id": "section",
      "description": "",
      "class": "",
      "after_title": "",
      "widget_id": "text-5"
    },
    "instance": {
      "title": "St",
      "text": "",
      "filter": false,
      "sidebar": "se-right",
      "sidebar-order": 0,
      "inherited": "yes",
      "number": 0
    }
  },
  {
    "id": "text-5",
    "widget": "hello",
    "params": {
      "0": "section-right",
      "name": "Right",
      "id": "section",
      "description": "",
      "class": "",
      "after_title": "",
      "widget_id": "text-5"
    },
    "instance": {
      "title": "Twitter Feed",
      "twitteruser": "Stei",
      "sidebar": "sectht",
      "sidebar-order": "4"
    }
  }
];

for (var i = 0; i < data.length; i++) {
  if (data[i].instance.twitteruser !== undefined) {
    console.log("Found it at index " + i + ".");
    break;
  }
}

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