Determine whether a JSON object contains a specific key.

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To determine whether a JSON object contains a specific key, you can use the hasOwnProperty() method in JavaScript.

Here's an example:

const jsonObj = {
   name: 'John',
   age: 25,
   city: 'New York'
};

if (jsonObj.hasOwnProperty('age')) {
   console.log('JSON object has the key "age"');
} else {
   console.log('JSON object does not have the key "age"');
}

In this example, we have a JSON object jsonObj with three keys: name, age, and city. We use the hasOwnProperty() method to check if the object has the key 'age', and based on the result we log the appropriate message to the console.