Gets all the properties you can call on an arbitrary JavaScript object and its prototype chain

props.js

function logAllProperties(obj) {
     if (obj == null) return; // recursive approach
     console.log(Object.getOwnPropertyNames(obj));
     logAllProperties(Object.getPrototypeOf(obj));
}
// logAllProperties(my_object);
// Using this, you can also write a function that returns you an array of all the property names:

function props(obj) {
    var p = [];
    for (; obj != null; obj = Object.getPrototypeOf(obj)) {
        var op = Object.getOwnPropertyNames(obj);
        for (var i=0; i<op.length; i++)
            if (p.indexOf(op[i]) == -1)
                 p.push(op[i]);
    }
    return p;
}
// console.log(props(my_object));
// or, get fancy with generators
function* propIter(obj) {
    for (; obj != null; obj = Object.getPrototypeOf(obj)) {
        yield Object.getOwnPropertyNames(obj); // or yield* for a flat output structure
    }
}
// [...propIter(obj)] or Array.from(propIter(obj))