Remove all null and undefined properties from an object

JavaScript

const removeNullUndefined = (obj) => Object.entries(obj).reduce((a, [k, v]) => (v == null ? a : ((a[k] = v), a)), {})

// Or
const removeNullUndefined = (obj) =>
  Object.entries(obj)
    .filter(([_, v]) => v != null)
    .reduce((acc, [k, v]) => ({ ...acc, [k]: v }), {})

// Or
const removeNullUndefined = (obj) => Object.fromEntries(Object.entries(obj).filter(([_, v]) => v != null))

Examples

removeNullUndefined({
  foo: null,
  bar: undefined,
  fuzz: 42,
}) // { fuzz: 42 }