Is an empty string a valid JSON key?

Question

Is a JSON object having an empty string as a key valid, for example { "c": "x", "": "y" }?

It certainly seems to be, or at least it doesn't seem to break the web if I using it in a browser as per this jsfiddle having the following code:

var a = { "a": "x", "b": "y" };
var b = { "c": "x", "": "y" };
var c = JSON.stringify(a);
var d = JSON.stringify(b);
console.log(c);
console.log(d);
var e = JSON.parse(c);
var f = JSON.parse(d);
console.log(e);
console.log(f);

There is a good reason why I need (want) to use an empty string for a key, but am I just asking for trouble, in terms of browser compatibility and future-proofing?

Answer 1

Tl;dr Yes it is.

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The ECMA spec states (highlighting is mine not the specs):

6 Objects

.....

The JSON syntax does not impose any restrictions on the strings used as names, does not require that name strings be unique, and does not assign any significance to the ordering of name/value pairs.

The section on how a string is formatted also allows you to go directly from " to the closing ":

9 String