Example of a virtual on a mongoose object

virtuals.js

AssetsSchema.virtual('test').get(function () {
  return Object.keys(this.licenseNode).reduce(({ prev, key }) => {
    if (typeof this.licenseNode[key] === Number && this.licenseNode[key] > 0) {
      prev[key] = this.licenseNode[key];
    }
    return prev;
  });
});