How To Debug js code in the board?

Hi, I faced some "random" out of memory errors after hours of no memory leakage running program. So if would suggest, humbly, some watch point based on free memory. This could allow for tricky unfreed memory after garbage collection. I mean local objects not really freed as beeing still referenced either recursively / undirectlyor through anonymous functions still accessible in some cases...
I know I am asking quite a lot, but it could help a lot with such a language such as javascript.

And yes, @Gordon is doing a tremendous demonstration of his capabilities to answer to his customers's problems.... I am really impressed by your reactivity!