848678 - there should be an async JSON.parse

Status: RESOLVED INVALID

(Core :: JavaScript Engine, defect)

Description

[Jan Gerber]

JSON.parse blocks the mainloop, this is bad for parsing large json documents, there should be an async JSON.parse function that takes a callback that gets called with the parsed json object.
something along the lines of:
  JSON.parse(data, function(obj) { do something here});

Comment 1

[Boris Zbarsky [:bzbarsky]]

See bug 832664?

Comment 2

[Jan Gerber]

I would need this as an unprivileged javascript api, bug 832664 could be the basis for this, but has notes like "primarily for chrome-privileged". If bug 832664 is about adding such an api to unprivileged javascript, this bug can be closed as a duplicate.

Comment 3

[Jeff Walden [:Waldo]]

ECMAScript has no concept of asynchrony at present, so this can't be a JS feature: it has to be a DOM feature.  (The underlying implementation would live in JS, of course.)  I think you want to present this need on the whatwg mailing list and get something hashed out there for implementation in the browser.

http://lists.whatwg.org/listinfo.cgi/whatwg-whatwg.org

Comment 4

[André Bargull [:anba]]

New features to JavaScript should now be proposed to TC39 [1] before being implemented in SpiderMonkey, therefore closing as INVALID.

[1] https://github.com/tc39/proposals/blob/master/CONTRIBUTING.md