html table based upon json object tree

I've got a dynamic json object that can contain different types of attributes and objects inside, could have plane strings or even arrays. I made a javascript code to convert a single JSON structure to an HTML table, worked great but id like to make it for a dynamic JSON, so basically I would need to iterate through the JSON tree parents and childs to see how do i create this HTML table.

But I do have some problems when trying to validate if a child has an object inside, like this: ( I don't want to add to many details to the JSON)

parent: {
    child_1: {
        attr1 : value1
    },
    child_2: {
          [{ attribues and values in an array }]
    }
}

How could I achieve this? I was thinking of using the "typeof" function like so:

if (typeof key === 'array') {
    // do something
}else{
    // do another stuff
}

But I don't believe it would work well, can you guys help me?

Thanks in advance.