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

Object.hasOwn()

The Object.hasOwn() static method returns true if the specified object has the indicated property as its own property. If the property is inherited, or does not exist, the method returns false.

Note: Object.hasOwn() is intended as a replacement for Object.prototype.hasOwnProperty().

ObjectsPropertiesOwnership

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).

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Practical Example: formvalid-tion

Object to requiredki- that include or check.

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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