javascript – Uncaught SyntaxError: Unexpected token :

javascript – Uncaught SyntaxError: Unexpected token :

Seeing red errors

Uncaught SyntaxError: Unexpected token <

in your Chrome developers console tab is an indication of HTML in the response body.

What youre actually seeing is your browsers reaction to the unexpected top line <!DOCTYPE html> from the server.

Just an FYI for people who might have the same problem — I just had to make my server send back the JSON as application/json and the default jQuery handler worked fine.

javascript – Uncaught SyntaxError: Unexpected token :

This has just happened to me, and the reason was none of the reasons above. I was using the jQuery command getJSON and adding callback=? to use JSONP (as I needed to go cross-domain), and returning the JSON code {foo:bar} and getting the error.

This is because I should have included the callback data, something like jQuery17209314005577471107_1335958194322({foo:bar})

Here is the PHP code I used to achieve this, which degrades if JSON (without a callback) is used:

$ret[foo] = bar;

function finish() {
    if ($_GET[callback]) {
        print $_GET[callback].(;
    print json_encode($GLOBALS[ret]);
    if ($_GET[callback]) {
        print );

Hopefully that will help someone in the future.

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