Catch angular.js HTTP response JSON parse errors?

Question

I have a legacy angular.js app that uses a PHP backend. If there is a bug in the PHP code, angular.js spews an unhelpful error like this:

angular.js:14199 SyntaxError: Unexpected token < in JSON at position 0
    at JSON.parse (<anonymous>)
    at fromJson (angular.js:1345)
    at defaultHttpResponseTransform (angular.js:10878)
    at angular.js:10969
    at forEach (angular.js:325)
    at transformData (angular.js:10968)
    at transformResponse (angular.js:11828)
    at processQueue (angular.js:16696)
    at angular.js:16712
    at Scope.$eval (angular.js:17994)

If I look in the Developer Console > Network > Response, I can find that the problem is that the PHP backend is just echoing HTML instead of a JSON, i.e. something like:

<br />
<b>Warning</b>:  Declaration of Reminder::save($json) should be compatible with CRMTable::save($json, $customFilter = NULL, $addLogEntry = true) in <b>C:\depot\web\qms2\qms\php-api\crm.php</b> on line <b>710</b><br />
<br />

Is there a way to 'catch' these parse errors so I can handle them better? Wrapping the HTTP POST call with try/catch doesn't help:

    try {
        return $http.post(API_URL + '/login', xsrf, {headers: {'Content-Type': 'application/x-www-form-urlencoded'}});
    }
    catch (e) {
        console.log("HTTP error:  ", e);
    }

$http methods return a $q promise so just use a promise catch() — charlietfl
– charlietfl, Commented Mar 29, 2021 at 22:51

hppycoder · Accepted Answer · 2021-03-29 21:02:02Z

0

You could do the following:

set_error_handler("warning_handler", E_WARNING);
/// Run your code that throws the warning
// Wherever this is running Reminder::save($json);
restore_error_handler();

function warning_handler($errno, $errstr) { 
    // do something like log to a real place?
}

answered Mar 29, 2021 at 21:02

hppycoder

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