Answer: JavaScript. What kind of script is used to run code on the client
Huh ? I don’t understand the question
Not entirely sure what you want to achieve, but consider this program:
var a = 'foo';
var b = 'bar';
var c = { first : a, second : b };
console.log(JSON.stringify(c, null, 4));
A json object c is constructed using the values from variables a and b. Is this what you mean?