Not able to get body content in javascript policy

[#1]

Hi,

I am sending body content as json format:

{

"firstname":"vinay" ,

"lastname":"soni"

}

now i have to receive this body content as a string in my javascript, so i can append it as query parameter of my target url like:

?info='{"firstname":"vinay" ,"lastname":"soni"}'

i have tried multiple things, but didn't get it as expected.

Need Help ??