Widely availableRecommended for direct property checks, especially when objects may not inherit the standard prototype methods safely.
Objects Widely available

Object.hasOwn()

Object.hasOwn() checks whether a property belongs directly to an object instead of being inherited from the prototype chain. It is a clearer alternative to older hasOwnProperty patterns.

ObjectsPropertiesOwnership

Overview

Object.hasOwn() checks whether a property belongs directly to an object instead of being inherited from the prototype chain. It is a clearer alternative to older hasOwnProperty patterns.

Browser support

Feature Desktop Mobile
Chrome
Edge
Firefox
Safari
Chrome Android
Safari iOS
javascript.builtins.Object.hasOwn
93
93
92
15.4
93
15.4
1+Supported (version) Not supported ※Has note Sub-feature descriptions sourced from MDN Web Docs (CC BY-SA 2.5)

Syntax

JAVASCRIPT 
const obj = Object.create(null);
obj.key = 'value';

// obj.hasOwnProperty('key'); // Error!
Object.hasOwn(obj, 'key'); // true

Live demo

Object.hasOwn Basics

Object that property has or confirm.hasOwnProperty. safeall alternative.

PreviewFullscreen

HasOwnProperty and. Comparison

also safeall to behavior. with Object.hasOwn is Object.create(null).

PreviewFullscreen

Practical Example: formvalid-tion

Object to requiredki- that include or check.

PreviewFullscreen

Use cases

  • Filtering own properties

    Distinguish local data from inherited helpers when iterating or validating object input.

  • Safer guard conditions

    Confirm a field exists directly on a record before reading or transforming it.

Cautions

  • hasOwn only checks property ownership, not whether the value is meaningful, valid, or non-empty.
  • Direct property checks do not replace schema validation for complex external data.

Accessibility

  • If ownership checks influence visible labels or options, keep the resulting UI states explicit so users understand what is available.

Related links

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