JSON.parse syntax error while JSONLint tell me that json string is valid

Question

I used the PHP built-in function json_encode() to covert an object array to json string. Then I use AJAX method to get the xmlhttp.responseText. I use document.write(xmlhttp.responseText) to check the response string. For example, the string is as follow:

{"index":0,"marks":2}

But, when I use JSON.parse() to parse the JSON string, I get a syntax error. So, I copy this string to JSONLint to check whether it's valid, the result is no.

Parse error on line 1:
{    "index": 0
^
Expecting '{', '['

But when I input it by hand, it's valid. Why?

which is it? "index":0 or "index":"0"?

davogotland
– davogotland

2012-01-12 12:54:11 +00:00
Commented Jan 12, 2012 at 12:54 — davogotland
– davogotland, Commented Jan 12, 2012 at 12:54

user123444555621 · Accepted Answer · 2012-01-12 15:26:33Z

1

You may have some zero-width whitespace character or similar in your responseText.

As a note, I highly recommend using console.log instead of document.write for debugging.

answered Jan 12, 2012 at 15:26

user123444555621

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