Remove all null and undefined properties from an object

Drop keys whose value is null or undefined.

JavaScript Version 1.0.0 · MIT · .md

function removeNullish(object) { return Object.fromEntries(Object.entries(object).filter(([, value]) => value != null)); }

Input & expected output

{
  "to": "[email protected]",
  "cc": null,
  "subject": "Order 8812",
  "templateId": null
}

{
  "to": "[email protected]",
  "subject": "Order 8812"
}

The edge case

{
  "a": 0,
  "b": "",
  "c": false
}

{
  "a": 0,
  "b": "",
  "c": false
}

Know the limits

• Only null and undefined are removed: 0, "" and false stay, as the edge case shows.
• Shallow: nested objects keep their nulls.

The function above is the implementation used by the lab. The lab validates JSON types and caps size before execution; include equivalent validation when accepting untrusted input in your application.

Keep exploring

• Pick properties from an object — Build a new object with only the requested own properties.
• Omit properties from an object — Keep the own enumerable fields that are not in a supplied list.
• Create an object from pairs of key and value — Turn [key, value] pairs into a plain object with Object.fromEntries.