syntaxerror : unexpected token < in json at position 0

Question

I have a problem in the opencart cart page , whenever the user want to remove an item from the cart the below massage is displayed

syntaxerror : unexpected token < in json at position 0
ok 
<pre>remove</pre>{"total":"0 item(s)-0.000 BD"}

i believe that

remove

should not be here , but unfortunately i couldn't find it in the files , any idea ?

Answer 1

Seems that your output should be json format, however you're printing those <pre>remove</pre> as well, which makes your json invalid.

Maybe You could try to use some grep in order to locate the file where those strings are coming from.

Answer 2

I know nothing about opencart... but your problem is that <pre>remove/pre> is "outside" of the json object, it must to be some thing like:

{"total":"0 item(s)-0.000 BD", "the_pre":"<pre>remove</pre>"} 

What I think is that you have a php code that is making an echo when you make this request (ajax request?) before arrive to the json object output.

Answer 3

i found the solution to this problem

in system/library/cart.php

under : public function remove($cart_id) delete the follwing :

   echo "<pre>";
            print_r("Remove");
            echo "</pre>"; )

that shall fix the problem