Javascript determine if such object property exists based on a string

Question

We have a module that allows users to create some scripts.

I would like to determine if user has used correct properties etc.

For example user has wrote:

var test = session;

I can do:

var something = eval("session");
if (!something){
    // Throw error here
}

But i'm facing issues with this:

var test = session.id; // session id property is "id123456"

I thought i can do:

var something = eval("session.id");
if (!something){
    // Throw error here
}

But it seems it really does this:

var something = eval("id123456");

Any suggestions how can i determine wheter property exist in this object, also property in property and further?

As i said, i'm not trying to determine some certain object for some certain property, the strcture can be:

session.id.toString().name ... and further

In addition, i have just tried this:

session.hasOwnProperty("id"); // returned false

session.id // returned "id123456"

Answer 1

Try code below:

eval('var session = {id:"id1234"}');
var x = eval("session")
console.warn(eval("x.id"))
console.error(eval("x.id.toString()"))
console.log(x.id)