# Omit properties from an object

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

Canonical: https://1loc.dev/object/omit-a-subset-of-properties-from-an-object/
Version: 1.0.0
Runtime: JavaScript · Node.js 22 / modern browsers
Verification: Local fixtures; no external services
Updated: 2026-10-28

## Implementation

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

## Input

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

## Expected output

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

## Edge case

Input:
```json
{
  "value": {},
  "keys": [
    "a"
  ]
}
```
Output:
```json
{}
```

## 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 lab validates types and size before calling this function. Add equivalent validation at your own trust boundary.

## Source and license

Original: https://github.com/phuocng/1loc/blob/14b481cf60dff1620ab1bb99a43b1f68068cdd9b/contents/omit-a-subset-of-properties-from-an-object.mdx
Author: Nguyen Huu Phuoc and original contributors
Contributors: See original repository history
Source commit: 14b481cf60dff1620ab1bb99a43b1f68068cdd9b
Copyright (c) 2020 phuoc-ng
License: MIT — https://1loc.dev/licenses/
Maintainer: Oveyon
Modifications: Curated implementation; explicit input bounds, edge cases, local fixtures and rebuilt presentation. Original MDX retained as inert source evidence.