javascript - JSON Parse Error Using jQuery.parseJSON

Question

This code fails with an exception indicating invalid JSON:

var example = '{ "AKEY": undefined }';
jQuery.parseJSON(example);

I was able to fix it by replacing all undefineds with empty strings. Are undefineds not part of JSON?

Answer 1

No, but null is. RFC 4627 §2.1:

A JSON value MUST be an object, array, number, or string, or one of the following three literal names:

  false null true

var example = '{ "AKEY": null }';