JSON hasOwnProperty() Method

JSON hasOwnProperty()

JSON hasOwnProperty() is a JavaScript method that returns a boolean indicating whether the object has the specified property as its own property.

In the following example, we will check whether the first object in an array (data) has age and hair properties.

Example

HTML Editor
<!DOCTYPE html> <html lang="en-US"> <body> <h1>JSON hasOwnProperty()</h1> <button onclick="myFunction()">Click Me</button> <script> var data = [ { "name": "Mike", "age": 36, "married": true } ] function myFunction(){ console.log(data[0].hasOwnProperty("age")) console.log(data[0].hasOwnProperty("hair")) } </script> </body> </html>

Syntax

object.hasOwnProperty("key");

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