how to store json in database

Is this better

{"details":{"number":"8","date":"29/06/2015","due_date":"06/07/2015"},

or this one:

%7B%22details%22%3A%7B%22number%22%3A%228%22%2C%22date%22%3A%2229%2F06%2F2015%22%2C%22due_date%22%3A%2206%2F07%2F2015%22

to store in a database?

Thank you.