​

const myObj = { 

    a: 1,

  b:'foo',

  c: '',

  d: null,

  e: undefined,

  f: {v: 1, w:'foo', x: '', y: null, z: undefined, m: {a:'asd'}}

  };

​

const removeEmpty = (obj) => {

  Object.keys(obj).forEach(key =>

    (obj[key] && typeof obj[key] === 'object') && removeEmpty(obj[key]) ||

    (obj[key] === undefined || obj[key] === null) && delete obj[key]

  );

  return obj;

};

​

console.log(removeEmpty(myObj));