How to update JSON Object value

Hello i have sort obj in my json file.. is there a way to update specific obj value the same with sqlite?

example:

{
"XXX":{
"RSS":"test",
"url":"www.test.com"
},

"YYY":{
"RSS":"test",
"url":"www.test.com"
}
}


any ideas guys how can i update the value in the url without re writing all the json value?

i want only to update or change the url in YYY.


Thank you.