Omit properties from an object

Keep the own enumerable fields that are not in a supplied list.

JavaScript Version 1.0.0 · MIT · .md

function omit({ value, keys }) { return Object.fromEntries(Object.entries(value).filter(([key]) => !keys.includes(key))); }

Input & expected output

{
  "value": {
    "content-type": "application/json",
    "idempotency-key": "order-confirmation:8812:1",
    "authorization": "Bearer $OVEYON_API_KEY"
  },
  "keys": [
    "authorization"
  ]
}

{
  "content-type": "application/json",
  "idempotency-key": "order-confirmation:8812:1"
}

The edge case

{
  "value": {},
  "keys": [
    "a"
  ]
}

{}

Know the limits

• This copies enumerable string-keyed properties only. Values remain shared.
• Do not use a denylist alone to filter confidential fields for an API response.

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.
• Create an object from pairs of key and value — Turn [key, value] pairs into a plain object with Object.fromEntries.
• Check if multiple objects are equal — Compare JSON serializations with the first object.