Remova as barras php
<?php
$str = "Is your name O\'reilly?";
// Salida: Is your name O'reilly?
echo stripslashes($str);
?>
Awful Albatross
<?php
$str = "Is your name O\'reilly?";
// Salida: Is your name O'reilly?
echo stripslashes($str);
?>json_decode($val, true, JSON_UNESCAPED_SLASHES);echo stripslashes('{\"test\":{\"test1\":{\"test1\":[{\"test2\":\"1\",\"test3\": \"foo\",\"test4\":\"bar\",\"test5\":\"test7\"}]}}}');
var finalData = str.replace(/\\/g, "");