Retrieve the names of keys from a JSON array for every version of browsers

I have a JSON array and I want to extract the key names associated with each object.

Despite my initial search efforts turning up no effective solutions, I managed to create my own approach:

var data = [{ Id: 25 }, {Year: 18} ];

$.each(data, function (i, element) {
    var stringfied = JSON.stringify(element);
    var parts = stringfied.split('":'); // separate key and value
    var key = parts[0].split('{"')[1]; // extract key
    console.info(key);
    console.info(element[key]);
});

I also experimented with other methods such as:

for (var key in data) {
    console.info(key);
    info(data[key]);
}

However, these approaches failed to display the key names accurately.

Is there a more efficient solution available? (Note that Object.keys may not work on older browser versions)

Answer №1

Consider the outcome of your code if a key starts with a colon.

This snippet will help you handle it:

var data = [
  {
    Id: 25
  }, 
  {
    Year: 18
  }
];

for (var i = 0; i < data.length; ++i) {
  var element = data[i];

  for (var k in element)
    if (element.hasOwnProperty(k)) {
      console.log(k);
      console.log(element[k]);
    }
}

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