'Unexpected token' when using JSON.parse from array made in PHP

Question

I'm trying to AJAX a JSON array but for some reason when I use JSON.parse it gives me the error: Uncaught SyntaxError: Unexpected token

Here is my PHP:

$infoJson = array('info' => array());
while($row = mysqli_fetch_array($query))
{
    array_push($infoJson['info'],
    [
        'section' => $row['section'],
        'source' => $row['source'],
        'project' => $row['project'],
        'client' => $row['client'],
        'date' => $row['date'],
        'id' => $row['id']
    ]);
}
echo json_encode($infoJson);

And here is the Javascript:

request = new XMLHttpRequest();
request.onreadystatechange = function()
{
    if(request.readyState == 4 && request.status == 200)
    {
        var response = request.responseText;
        response = JSON.parse(response);
    }
}
request.open('GET','http:edit.php?requestedArray=printArray',true);
request.send();

Also here is exactly what the PHP is echoing:

{"info":[{"section":"printArray","source":"http:\/\/upload.wikimedia.org\/wikipedia\/commons\/thumb\/7\/7a\/SNES-Controller.jpg\/1280px-SNES-Controller.jpg","project":"SNES","client":"Nintendo","date":"1990","id":"7"},{"section":"printArray","source":"http:\/\/ecx.images-amazon.com\/images\/I\/81Q0l1t%2BaJL._SL1500_.jpg","project":"Playstation","client":"Sony","date":"1994","id":"8"},{"section":"printArray","source":"http:\/\/upload.wikimedia.org\/wikipedia\/commons\/e\/ed\/Xbox-360-S-Controller.png","project":"Xbox 360","client":"Microsoft","date":"2005","id":"9"}]}

If I don't use JSON.parse and console.log response, I do receive it as a string.

Are you using jQuery at all, I usually just do $.post, you could try sending header('Content-Type: application/json'); but I'm not sure if that would have any effect. — ArtisticPhoenix
– ArtisticPhoenix, Commented Jul 11, 2014 at 23:59
possible duplicate of JSON.parse throwing illogical Syntax Error: Unexpected token — Jacob Krall
– Jacob Krall, Commented Jul 12, 2014 at 0:06

Jacob Krall · Accepted Answer · 2014-07-11 23:59:39Z

4

Your output parses fine, except for the invalid, invisible character '\ufeff' at the beginning of the string. This is the UTF-16 byte order mark. You are probably sending the string with an incorrect/missing charset in your Content-Type header.

answered Jul 11, 2014 at 23:59

Jacob Krall

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3 Comments

ArtisticPhoenix Over a year ago

Just out of curiosity how do you tell that?

Jacob Krall Over a year ago

Triple-click the text in the question, paste it into the JavaScript console:

var s = '<paste>'; s.charCodeAt(0); /* 65279 */ JSON.parse(s); /* Unexpected token */ JSON.parse(s.substr(1));  /* Object { info: Array[3] }  */

LIGHT Over a year ago

Whats the fix ?

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