A string literal is the strings you type in your scripts. To get certain characters, you must escape them because either you can't type them or they would cause problems.
Example is this: "hello\n\"quote\""
In JSON (which is the format of that link you sent me), string literals are also used. What you'd have to do, I guess, is search for what you want to find (such as "\"status\"") then search for the next quotation mark, by using strfind with the pos parameter. After you found the position of the next quotation mark, use strfromliteral to read what's inside it.