How to Check If a Key Exists in a JavaScript Object

Hello Nerds

Checking if a specific key exists in a JavaScript Object is a common task in programming. We will here describe some most common patterns with which you can get check if key exists in a Javascript Object

In the first way, you can use very simple way in operator to check if a particular key or property exists in your javascript object. The operator returns true if the specified key existing in the object, otherwise it will return false

// This is a Sample object
var myCar = {
    make: "Tata",
    model: "Punch",
    year: 2024
};

// This line Test if a key exists in the object
if("model" in myCar === true) {
    alert("Key Exists in the object");
} else {
    alert("Key doesn't exist in the object");
}        

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Check If a Key Exists in a JavaScript Object