You need to use the method object.hasOwnProperty(property). It returns true if the object has the property and false if the object doesn't.

Jan 24, 2023 · The 3 ways to check if an object has a property or key in JavaScript: hasOwnProperty() method, in operator, comparing with undefined.

Mar 6, 2025 · Returns true if the object has the specified property as own property; false otherwise. The hasOwnProperty() method returns true if the specified property is a direct …

Dec 18, 2023 · The hasOwnProperty() method checks if an object has a property of its own and is not inherited from its prototype chain. Syntax: if …

Apr 21, 2010 · Object.hasOwn is a new static method (not fully supported by all browsers yet) which checks if the specified object has the indicated property as his own property and return …

Sep 1, 2016 · https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/hasOwnProperty As an …

Jun 23, 2023 · The ‘hasOwnProperty()’ function in JavaScript is used to check if an object has a specific property. It returns a boolean value: ‘true’ if the property exists, and ‘false’ if it doesn’t.

Feb 27, 2025 · One of the most common ways to check if an object has a property is by comparing the type of the property to undefined. The typeof operator returns a string …

Nov 23, 2024 · To check if an object has a property defined directly on it (excluding properties from the prototype chain), you can utilize the .hasOwnProperty() method: a: 1, b: 2 }; if …

Object has property: If you are testing for properties that are on the object itself (not a part of its prototype chain) you can use .hasOwnProperty(): if (x.hasOwnProperty('y')) { // ..... } Object or …