Convert Javascript Object (incl. functions) to String

Question

Hey, Im trying to convert specific javascript objects to a String. So far I\'m working with json2.js. As soon as my Object contain functions, those functions are stripped. I

Answer 1

Actually, I think it is possible and easy. At least when doing jsonP with nodeJS it works for me just fine, and it's demonstratable by the following fiddle. I did it by simply adding strings to a function:

var anyString = '';
var aFunction = function() { return true; };
var functionToText = anyString + aFunction;
console.log(functionToText);

here's the fiddle: http://jsfiddle.net/itsatony/VUZck/

Answer 2

functionName.toString() will return a string of all the function code. I cut is after the name.

var funcString = CurrentButton.clickFunc.toString();
console.log("calling:" + funcString.substr(0, funcString.indexOf(")")-1));

Answer 3

I made a improved version based on the @SIMDD function, to convert all types of objects to string.

Typescript code:

function anyToString(valueToConvert: unknown): string {
    if (valueToConvert === undefined || valueToConvert === null) {
        return valueToConvert === undefined ? "undefined" : "null";
    }
    if (typeof valueToConvert === "string") {
        return `'${valueToConvert}'`;
    }
    if (
        typeof valueToConvert === "number" ||
        typeof valueToConvert === "boolean" ||
        typeof valueToConvert === "function"
    ) {
        return valueToConvert.toString();
    }
    if (valueToConvert instanceof Array) {
        const stringfiedArray = valueToConvert
            .map(property => anyToString(property))
            .join(",");
        return `[${stringfiedArray}]`;
    }
    if (typeof valueToConvert === "object") {
        const stringfiedObject = Object.entries(valueToConvert)
            .map((entry: [string, unknown]) => {
                return `${entry[0]}: ${anyToString(entry[1])}`;
            })
            .join(",");
        return `{${stringfiedObject}}`;
    }
    return JSON.stringify(valueToConvert);
}

Vanilla Javascript code:

function anyToString(valueToConvert) {
    if (valueToConvert === undefined || valueToConvert === null) {
        return valueToConvert === undefined ? "undefined" : "null";
    }
    if (typeof valueToConvert === "string") {
        return `'${valueToConvert}'`;
    }
    if (typeof valueToConvert === "number" ||
        typeof valueToConvert === "boolean" ||
        typeof valueToConvert === "function") {
        return valueToConvert.toString();
    }
    if (valueToConvert instanceof Array) {
        const stringfiedArray = valueToConvert
            .map(property => anyToString(property))
            .join(",");
        return `[${stringfiedArray}]`;
    }
    if (typeof valueToConvert === "object") {
        const stringfiedObject = Object.entries(valueToConvert)
            .map((entry) => {
            return `${entry[0]}: ${anyToString(entry[1])}`;
        })
            .join(",");
        return `{${stringfiedObject}}`;
    }
    return JSON.stringify(valueToConvert);
}

ATENTION!

I am using the function Object.entries(), winch currently is a draft. So if you are not using Babel or typescript to transpile your code, you can replace it with a for loop or the Object.keys() method.

Answer 4

Use String() function http://www.w3schools.com/jsref/jsref_string.asp

var f = function(a, b){
    return a + b; 
}
var str = String(f);

Answer 5

Just provide the object to this function. (Look for nested function) Here:

function reviveJS(obj) {
  return JSON.parse(JSON.stringify(obj, function (k, v) {
    if (typeof v === 'function') {
      return '__fn__' + v;
    }
    return v;
  }), function (k, v) {
    if (typeof v === 'string' && v.indexOf('__fn__') !== -1) {
      return v;
    }
    return v;
  });
}

UPDATE

A slightly decent code than above which I was able to solve is here http://jsfiddle.net/shobhit_sharma/edxwf0at/

Answer 6

convert obj to str with below function:

function convert(obj) {
  let ret = "{";

  for (let k in obj) {
    let v = obj[k];

    if (typeof v === "function") {
      v = v.toString();
    } else if (v instanceof Array) {
      v = JSON.stringify(v);
    } else if (typeof v === "object") {
      v = convert(v);
    } else {
      v = `"${v}"`;
    }

    ret += `\n  ${k}: ${v},`;
  }

  ret += "\n}";

  return ret;
}

input

const input = {
  data: {
    a: "@a",
    b: ["a", 2]
  },

  rules: {
    fn1: function() {
      console.log(1);
    }
  }
}

const output = convert(obj)

output

`{
  data: {
    a: "@a",
    b: ["a", 2]
  },
  rules: {
    fn1: function() {
      console.log(1);
    }
  }
}`

// typeof is String