Get value from json array using javascript

How do get the first name “Niranth” with the following json?

[
 {"firstName":"Niranth","lastName":"Padmonkar","wins":12},
 {"firstName":"Nick","lastName":"Tallent","wins":10}, 
 {"firstName":"Kyle","lastName":"Brisson","wins":5}, 
 {"firstName":"Kyle","lastName":"Brisson","wins":5}
]

Here’s what I have tried.

var data = Http.responseText;
var objects = JSON.parse(data)

document.getElementById("Slot1Name").innerHTML = data[0].firstName;