JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.3/underscore-min.js"></script>

JavaScript

var obj = {name: 'John', age: null};

console.log("Starting object: ", obj);

var compacted = _.pick(obj, function(value) {
  return value !== null && value !== undefined;
});

console.log('With null values removed:', compacted);