How To Check If a Variable is a String in JavaScript

JavaScript provides several ways to check if a variable is a string. One of the most common methods is to use the typeof operator, which returns the type of a variable. For example, the following code checks if a variable named “myVar” is a string:

if (typeof myVar === "string") {
  console.log("myVar is a string");
} else {
  console.log("myVar is not a string");
}

Another way to check if a variable is a string is to use the instanceof operator, which returns true if an object is an instance of a particular constructor. For example, the following code checks if a variable named “myVar” is an instance of the String constructor:

if (myVar instanceof String) {
  console.log("myVar is a string");
} else {
  console.log("myVar is not a string");
}

Another way to check if a variable is a string is to use the Object.prototype.toString.call() method. This method returns a string representing the object’s constructor. For example, the following code checks if a variable named “myVar” is a string:

if (Object.prototype.toString.call(myVar) === "[object String]") {
  console.log("myVar is a string");
} else {
  console.log("myVar is not a string");
}

Lastly, we can use the constructor property

if(myVar.constructor === String) {
  console.log("myVar is a string");
} else {
  console.log("myVar is not a string");
}