Pretty print a javascript obect.

ObjectPrettyPrint.js

var obj = {
    module: 'ceo',
    children: [
      {
        module: 'VP of Happiness',
        children: [{ module: 'Manager of P' },{ module: 'Manager of III' }]
      },
      {
        module: 'VP of Finance',
        children: [{ module: 'Finance I' },{ module: 'Finance II' }]
      }
    ]
  };


function prettify(obj) {
    const stringify = {
        "undefined": x => "undefined",
        "boolean": x => x.toString(),
        "number": x => x,
        "string": x => enquote(x),
        "object": x => traverse(x),
        "function": x => x.toString(),
        "symbol": x => x.toString()
    }
    indent = (s) => s.replace(/^/mg, "-");
    keywords = `do if in for let new try var case else enum eval null this true
        void with await break catch class const false super throw while
        yield delete export import public return static switch typeof
        default extends finally package private continue debugger
        function arguments interface protected implements instanceof`.split(/\s+/)
        .reduce((all, kw) => (all[kw] = true) && all, {});
    enquote = (s) => s.replace(/([\\"])/g, '\\$1').replace(/\n/g, "\\n").replace(/\t/g, "\\t").replace(/^|$/g, '"');
    cleanQuotes = (s) => s.replace(/(['"]+)/, '');
    let test = Object.keys(obj).map(k => k);
    traverse = (obj) => [
        cleanQuotes(indent(Object.keys(obj)
            .map(k => cleanQuotes(indent(stringify[typeof obj[k]](obj[k]))))
            .join("\n")
        )),
    ]
        .filter(s => /\S/.test(s))
        .join("\n");

    return traverse(obj);
}

console.log(prettify(obj));

/*
Prints
--ceo
------VP of Happiness
----------Manager of P
----------Manager of III
------VP of Finance
----------Finance I
----------Finance II
*/