nodejs - stringify js error/object - stolen from http://stackoverflow.com/a/20405830

myerror.js

var stringifyError = function(err, filter, space) {
    var plainObject = {};
    Object.getOwnPropertyNames(err).forEach(function(key) {
        plainObject[key] = err[key];
    });
    return JSON.stringify(plainObject, filter, space);
};


try {
    require('net').connect(-1);
} catch(err) {
    console.log(stringifyError(err, null, ''));
}

try {
    doesNotExist;
} catch(err) {
    console.log(stringifyError(err, null, '\n'));
}

try {
    require('vm').runInThisContext('binary ! isNotOk');
} catch(err) {
    console.log(stringifyError(err, null, '\n'));
}

try {
    require('url').parse(() => {});
} catch(err) {
    console.log(stringifyError(err, null, '\n'));
}

err = "";
console.log(stringifyError(err, null, '\n'));

err = [];
console.log(stringifyError(err, null, '\n'));

err = {'abc': true, 'def': 'something'};
console.log(stringifyError(err, null, '\n'));