Question

let’s say that you have a script that needs to run on a page that overrides javascript’s JSON.stringify, how would you ensure that your code would use the original stringify not the overridden one?

Answer 1

While I would opt for one of the other answers, here is a solution for the case when:

1. The page cannot be altered and thus;
2. Code cannot be run before the code that overwrites JSON.stringify and thus;
3. Code cannot save the original function-object (to restore it or use it explicitly later).

Here is then a hack:

1. Create an IFRAME element.
2. Access the contentWindow property of the IFRAME element; this should then contain the original (or “a new untouched”) JSON object and thus the original JSON.stringify function.

Here is the jsfiddle