[javascript] JSON array javascript

I need to store 3 pet names in string format, parse them into array and later read one by one

Example

pets = '{{"name":"jack"},{"name":"john"},{name:"joe"}}';

var arr = JSON.parse(pets);

alert(arr[0].name);

But it doesn't work.

Also I would need to add entry to array (probably with push) but I am having problems too.

Someone has idea how to do it?