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JSON.stringify() will remove any functions from an object.

Convert functions into strings to keep them in the JSON object.

// create JavaScript object with an "age" function
const obj = {name: "John", age: function () {return 30;}, city: "New York"};

// convert "age: function () {return 30;}" to a JS string
obj.age = obj.age.toString();

// create JSON string
const myJSON = JSON.stringify(obj);
document.getElementById("demo").innerHTML = myJSON;

• Once a JS function is converted to a string with toString() function, it may be sent to a server using JSON.stringify() and XMLHttp.
• If you send functions using JSON, the functions will lose their scope, and the receiver would have to use eval() to convert them back into functions.