JSON.parse doesn't seem to parse object data?

Question

I am communicating between iframes, but json.parsing to a var then using document.write to dump it doesn't contain anything. But if I alert(e.data), it does.

<script>
window.onmessage = function(e) {

var j = JSON.parse(e.data);
document.write(j);
}
</script>

<script>window.postMessage("[1, 5, 'false']", '*');</script>

The string value "[1, 5, 'false']" is not JSON. The string '[1, 5, "false"]' is. See json.org — JayC
– JayC, Commented Oct 7, 2013 at 20:37
... and perhaps the intention was actually "[1, 5, false]"? — bfavaretto
– bfavaretto, Commented Oct 7, 2013 at 20:37
Well, I also missed pointing that a string like "foo" doesn't have a data member. — JayC
– JayC, Commented Oct 7, 2013 at 20:39
A string may not, but the expected dispatched event argument does have a data member (as well as origin and source). — user530189
– user530189, Commented Oct 7, 2013 at 20:48

Andrés Torres · Accepted Answer · 2013-10-07 20:43:41Z

1

For a correctly parse of a string into a JSON object strings keys and values must be wrapped by quotes "

answered Oct 7, 2013 at 20:43

Andrés Torres

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Esteban · Accepted Answer · 2013-10-07 20:48:09Z

0

JSON.parse() is defined in ECMA-262, fifth edition, almost any browser supports it.

How to use it?

var json = '{"prop":"first","prop2":1}';
var o = JSON.parse(json);

If you're using jquery, it has a parse json function $.parseJSON, but its slower than native JSON.parse, so it's better to use the jquery function if the JSON object is not available.

var json = '{"prop":"first","prop2":1}';
var o = JSON && JSON.parse(json) || $.parseJSON(json);

answered Oct 7, 2013 at 20:48

Esteban

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