SyntaxError: Unexpected token < in JSON at position 0 json_encode

Question

I have looked through previous answers but i cant find anything.

I am using this to send my response;

echo json_encode($response);

From inspecting the result I am receiving this to the page in the Response;

    <br />
<font size='1'><table class='xdebug-error xe-warning' dir='ltr' border='1' cellspacing='0' cellpadding='1'>
<tr><th align='left' bgcolor='#f57900' colspan="5"><span style='background-color: #cc0000; color: #fce94f; font-size: x-large;'>( ! )</span> Warning: mail(): Failed to connect to mailserver at &amp;quot;localhost&amp;quot; port 25, verify your &amp;quot;SMTP&amp;quot; and &amp;quot;smtp_port&amp;quot; setting in php.ini or use ini_set() in C:\wamp64\www\ci7\php\MailSender.php on line <i>68</i></th></tr>
<tr><th align='left' bgcolor='#e9b96e' colspan='5'>Call Stack</th></tr>
<tr><th align='center' bgcolor='#eeeeec'>#</th><th align='left' bgcolor='#eeeeec'>Time</th><th align='left' bgcolor='#eeeeec'>Memory</th><th align='left' bgcolor='#eeeeec'>Function</th><th align='left' bgcolor='#eeeeec'>Location</th></tr>
<tr><td bgcolor='#eeeeec' align='center'>1</td><td bgcolor='#eeeeec' align='center'>0.0018</td><td bgcolor='#eeeeec' align='right'>377472</td><td bgcolor='#eeeeec'>{main}(  )</td><td title='C:\wamp64\www\ci7\php\contact.php' bgcolor='#eeeeec'>...\contact.php<b>:</b>0</td></tr>
<tr><td bgcolor='#eeeeec' align='center'>2</td><td bgcolor='#eeeeec' align='center'>0.0039</td><td bgcolor='#eeeeec' align='right'>400616</td><td bgcolor='#eeeeec'>Apolo\MailSender->send(  )</td><td title='C:\wamp64\www\ci7\php\contact.php' bgcolor='#eeeeec'>...\contact.php<b>:</b>58</td></tr>
<tr><td bgcolor='#eeeeec' align='center'>3</td><td bgcolor='#eeeeec' align='center'>0.0040</td><td bgcolor='#eeeeec' align='right'>401224</td><td bgcolor='#eeeeec'><a href='http://www.php.net/function.mail' target='_new'>mail</a>
(  )</td><td title='C:\wamp64\www\ci7\php\MailSender.php' bgcolor='#eeeeec'>...\MailSender.php<b>:</b>68</td></tr>
</table></font>
{"status":"fail","errors":"Could not send a mail, sorry. Please try again."}

However, I get the error and i am not sure why?

This is the javascript;

        $.ajax({
        url: config.url,
        type: 'POST',
        dataType: 'json',
        data: $form.serialize(),
        success: function(data){
            if(data.status && data.status == 'fail') {
                $.Apolo.modules.alertMessage({
                    target: $form,
                    type: 'error',
                    message: data.errors,
                    icon: 'warning'
                });
                $form.trigger('apolo.contactFormMessage');
                config.onError.call($form, data);
            }
            else if(data.status && data.status == 'success') {
                $.Apolo.modules.alertMessage({
                    target: $form,
                    type: 'success',
                    message: data.statusText,
                    icon: 'check'
                });
                $form.find('input, textarea').val('');
                $form.trigger('apolo.contactFormMessage');
                config.onSuccess.call($form, data);
            }
        },
        error: function(jqXHR, textStatus, errorThrown){
            $.Apolo.modules.alertMessage({
                target: $form,
                type: 'error',
                message: errorThrown,
                icon: 'warning'
            });
            $form.trigger('apolo.contactFormMessage');
            config.onError.call($form, arguments);
        }
    });

paulsm4 · Accepted Answer · 2019-01-21 03:04:55Z

1

Here's what's happening:

https://www.kevinleary.net/syntax-error-unexpected-token-json-position-0/

If you’re seeing a SyntaxError: Unexpected token < in JSON at position 0 error in your browser console at angular.js:13920, or Line 13920 or angular.min.js, then it’s likely that you’re working with HTTP API’s, possibly using $resource or $http, and one of the API’s has an error notice or warning in the response body.

In other words, the "response" you're getting is NOT JSON. It's HTML - an HTML error message. With a JSON string at the end.

You're doing the right thing - you have both success: function(data) and error: function() callbacks in your XHR request.

You need to:

Ensure that an "error" response from the server results in triggering the "error" callback in your Javascript, and/or
Detect when the server is sending a non-JSON response to either callback.

edited Jan 21, 2019 at 3:04

answered Jan 21, 2019 at 2:58

paulsm4

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1 Comment

Anthony Over a year ago

As per the above, the mail function was generating a PHP error which was being returned in HTML before the JSON response. Suppressing the mail function error with '@' stopped the error prior to the response I required.

Anthony · Accepted Answer · 2019-01-21 03:07:52Z

1

Ok I have solved the issue by adding @ in the mail function which removes the x-debug error and gives a clean response i.e.

            if(@!mail($email, $subject, $message, $headers)){

            $this->addError('Could not send a mail, sorry. Please try again.');
            return false;

        }

answered Jan 21, 2019 at 3:07

Anthony

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2 Comments

paulsm4 Over a year ago

In other words, you've modifed your PHP back-end to suppress the PHP-generated HTML error text your Javascript front-end was gagging on: php.net/manual/en/language.operators.errorcontrol.php that

Anthony Over a year ago

Exactly and as no PHP errors are returned, then you only receive the JSON response.

anhvietcr · Accepted Answer · 2019-01-21 02:58:01Z

0

Try parse object response:

var objData = JSON.parse(data);

or in Ajax

dataType: 'application/json'

or in server

header('Content-Type: application/json');
echo json_encode($response);

answered Jan 21, 2019 at 2:58

anhvietcr

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