[destus]

redshuhard,
А зачем вам его в PHP получать?

var some = '[{"id":"555c8e8438613a1b6f665efc","name":"First List","closed":false,"idBoard":"555c8e81e8d5aff570 505f5b","pos":10239.90625,"subscribed":false},{"id ":"55cce7e390e2b8ad5bc65a3c","name":"Second List","closed":false,"idBoard":"555c8e81e8d5aff570 505f5b","pos":65535.25,"subscribed":false}]';
       alert(JSON.parse(some)[0].name);

Вместо some ваша переменная.