Everything is persistent in Self, so storing data is easy. If you want to store something specific to a user, you can store it on their user object using the "speaker" variable. speaker.userid = "user1"; speaker.password = "12345"; To store something specific to the current conversation use the "conversation" variable. conversation.userid = "user1"; conversation.password = "12345"; To store a global variable use the "#" symbol to create a global symbol object. #credentials.userid = "user1"; #credentials.password = "12345"; To use a variable in a GET or POST call just set in in the parameters. var info = Http.requestJSON("https://www.api.com/fetch?user=" + speaker.userid + "&password=" + speaker.password);