JavaScript, how to get the class name of an object
New Courses Coming Soon
Join the waiting lists
If you have an object that's generated from a class, and you want to get its class name. How can you do so?
Suppose you have an object that’s generated from a class, and you want to get its class name.
For example, let’s use this code as reference:
class Dog {
}
const roger = new Dog()
Of course now we know that roger
is an object that’s created from the class Dog
.
But how do you get the class name of the object, in case you don’t know it?
You can lookup the object’s constructor, then reference its name
property.
In this example:
class Dog {
}
const roger = new Dog()
console.log(roger.constructor.name) // 'Dog'
This method returns a string that represents the class name.
You can also directly compare the constructor
property to the class, like this:
class Dog {
}
const roger = new Dog()
roger.constructor === Dog //true
→ Get my JavaScript Beginner's Handbook
→ Read my
JavaScript Tutorials
on The Valley of Code
→ Read my
TypeScript Tutorial
on The Valley of Code
Here is how can I help you:
- COURSES where I teach everything I know
- CODING BOOTCAMP cohort course - next edition in 2025
- BOOKS 16 coding ebooks you can download for free on JS Python C PHP and lots more
- Follow me on X