Retrieving the value of a specific property nested within a JSON object using basic JavaScript

Hey there! Thanks for taking the time to check out my question. I'm diving into JavaScript and I've hit a roadblock trying to solve this particular problem:

I'm looking to extract the value of a property nested within a JSON object under a dynamically changing property name. Here's the JSON object:

{
  "batchcomplete": "",
  "query": {
    "normalized": [
      {
        "from": "Theodore_Rubin",
        "to": "Theodore Rubin"
      }
    ],
    "pages": {
      "11820415": {
        "pageid": 11820415,
        "ns": 0,
        "title": "Theodore Rubin",
        "contentmodel": "wikitext",
        "pagelanguage": "en",
        "pagelanguagehtmlcode": "en",
        "pagelanguagedir": "ltr",
        "touched": "2016-02-12T17:34:52Z",
        "lastrevid": 138813300,
        "length": 34,
        "redirect": "",
        "new": "",
        "fullurl": "https://en.wikipedia.org/wiki/Theodore_Rubin",
        "editurl": "https://en.wikipedia.org/w/index.php?title=Theodore_Rubin&action=edit",
        "canonicalurl": "https://en.wikipedia.org/wiki/Theodore_Rubin"
      }
    }
  }
}

My goal is to capture the value of the fullurl property in a variable. While I know that using bracket and dot notation like query.pages["2123909"].fullurl can access it, the challenge is that the property name changes with each JSON request.

How could I retrieve the value of the fullurl property without knowing its parent property name?

Your assistance is greatly appreciated!

javascriptjson

Answer №1

When dealing with a single key, the first element can be accessed using Object.keys on the data.query.pages object.

var info = {
        "status": "success",
        "result": {
            "details": [
              {
                  "id": 12345,
                  "name": "John Doe"
              }
            ],
            "summary": {
                "12345": {
                    "id": 12345,
                    "age": 30,
                    "occupation": "Engineer"
                }
            }
        }
    };

console.log(info.result.summary[Object.keys(info.result.summary)[0]].age);

Answer №2

In cases where the object only contains a single property name, it is recommended to retrieve the property name and access the property using bracket notation:

var key = // reference https://stackoverflow.com/q/6765864/218196
query.pages[key].fullurl

For objects with multiple properties, it is best to iterate over the object using a method like for...in. You can find more information on how to access and manipulate nested objects, arrays, or JSON in this Stack Overflow post.

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