How to get the Class name of an Object in JavaScript

JavaScript supports object-oriented programming, which means that you can create classes and objects, and use them to store data.

One useful thing to be able to know from an object is the name of the class it was created from.

In this post, we'll learn how you can get the class name of an object in JavaScript.

Getting the class name of an object

First let's start with a class and an object created from it.

JAVASCRIPT
class Shape {}

const triangle = new Shape();

Given the object triangle, we can get the class name of it using the constructor property, which returns a reference to the constructor function that created the object, then using the name property to get the name of the class.

JAVASCRIPT
class Shape {}

const triangle = new Shape();

console.log(triangle.constructor.name);

BASH
Shape

The reason this works is you can use the constructor property to get the class of an object, which includes the name, along with other properties.

Because most things in JavaScript are objects, they will therefore have a valid constructor property.

Conclusion

In this post, we'll learn how you can get the class name of an object in JavaScript by using the constructor property.

This is useful because it allows you to get the name of the class that created an object, which can be useful for debugging.

Thanks for reading!

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