How to retrieve the value from a JSON object when the key is unknown in JavaScript

Here is the JSON file I'm working with:

{
  "status": 200,
  "msg": "OK",
  "result": {
    "files": {
      "count": 1,
      "pUnJbKzql0f2": {
        "name": "How do I access this",
        "active": "yes"
      }
    }
  }
}

I need to retrieve the value of the key name from the JSON file above. The challenge is that the key pUnJbKzql0f2 changes each time the file is requested, and I have no control over it. In PHP, we could use functions like array_keys or array_key_exists, but I'm looking for a JavaScript-specific solution.

json['result']['files'][what should I put here]['name']

                      ^^^^^^^^^^^^^^^^^^^^^^^

If anyone has a solution, please share it here.

javascriptjson

Answer №1

To identify the desired key and its corresponding value, one must analyze the contents of .result.files by utilizing a for-in loop to read the keys.

This code snippet showcases the process of locating an unknown key (and its value) based on it not being the specified key count. In cases where the object contains additional properties, a strategy must be devised to exclude all except the required one.

let searchedKey = "";
let searchedName = "";
const obj = {
  "status": 200,
  "msg": "OK",
  "result": {
    "files": {
      "count": 1,
      "pUnJbKzql0f2": {
        "name": "How do I access this",
        "active": "yes"
      }
    }
  }
}

files = obj.result.files // an object with 2 properties

 for (key in files) {
 
 if (key != "count") {
 
 searchedKey = key;
 searchedName = files[key].name

 } // end if;
      
 } // next key in files

 console.log(`${searchedKey} with name property: ${searchedName}`)

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