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Convert a string into a function.

const text = '{"name":"John", "age":"function() {return 30;}", "city":"New York"}';
const obj = JSON.parse(text);

// evaluate obj.age
obj.age = eval("(" + obj.age + ")");
document.getElementById("demo").innerHTML = obj.name + ", " + obj.age();

You should avoid using functions in JSON, the functions will lose their scope, and you would have to use eval() to convert them back into functions.