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<!DOCTYPE html> <html> <body> <h2>Convert a string into a function.</h2> <p id="demo"></p> <script> const text = '{"name":"John", "age":"function() {return 30;}", "city":"New York"}'; const obj = JSON.parse(text); obj.age = eval("(" + obj.age + ")"); document.getElementById("demo").innerHTML = obj.name + ", " + obj.age(); </script> </body> </html>