Replacing a property value in JSON

Question

If I have a JSON structure that looks something like this:

var user = {
    map: {
        width: 785,
        height: 791
    },
    image: {
        name: "image.png",
        size: {width:32}
    },
    properties:[{
        firstName: "Bob",
        lastName: "Jones",
    }]
};

How would I change (after creation) the value of the firstName property to "Jane"?

I am fairly new to JSON, and I'm just trying to figure out how to make this one change for now. Any help would be greatly appreciated.

Answer 1

Well, one reason for your confusion might be that this is not JSON at all. JSON is a text format used for serialising objects. This is just a literal object in Javascript.

To change the firstName property, you would access the first item in the properties array in the user object:

user.properties[0].firstName = "Jane";