Calculating usage of localStorage space

Question

I am creating an app using the Bespin editor and HTML5\'s localStorage. It stores all files locally and helps with grammar, uses JSLint and some other parsers for CSS and HT

Answer 1

Wish I could add this in a comment - not enough rep, sorry.

I ran some perf tests - expecting JSON.stringify(localStorage).length to be an expensive op at large localStorage occupancy.

http://jsperf.com/occupied-localstorage-json-stringify-length

It is indeed so - about 50x more expensive than keeping track of what you're storing, and gets worse the fuller localStorage gets.