How to access elements of JSON object without knowing the key names

In this tutorial we will learn how to access elements of JSON object without knowing the key names.

Suppose the following is the JSON:

{
"d":{
"key1":"value1",
"key2":"value2"
}
}

To access the first key write::

let firstKey=Object.keys(d)[0];

To access the value of the first key write:

let firstValue= d[firstKey];