storing and retrieving json objects to / from a cookie

Question

Im attempting to store json objects in a cookie, but im running into a few problems. I can create my object like this:

product = {
   "name" : "prodname",
   "quantity" : 4
}

i then save this object in my cookie. As more products are added (its a shopping basket) i add further strings by appending new objects onto the end of the cookie string (so i essentially have lots of small seperate objects) . Im having trouble getting the objects back out of the cookie string though. Both $.parseJSON and eval fail when i attempt to read the objects back from the cookie. Any help would be appreciated.

Answer 1

its not a good practice to save the value that returned from JSON.stringify(cookieStr) to the cookie. it can lead to a bug in some browsers.

before using it you should convert it to base64 (using btoa), and when reading it, converting from base64 (using atob)

val = JSON.stringify(cookieStr)
val = btoa(val)

write_cookie(val)