You're missing a , in your 3rd object, after age:
var cheese_array = [
{
name: "Chedder",
age: "34",
smelly: true
},
{
name: "Brie",
age: "4",
smelly: false
},
{
name: "Blue Stilton",
age: "13",
smelly: true
}
];
var jsonObj = JSON.stringify(cheese_array);
This will now work and display correctly.