---
title: "JavaScript typeof operator"
url: https://weworkworldwide.com/tutorials/javascript-typeof-operator-3/
description: "In this section we will learn what the typeof operator is and how to use it in JavaScript. What is typeof operator in JavaScript? (JavaScript Check Type )"
date: 2026-07-29T17:00:05+00:00
source: https://weworkworldwide.com/llms.txt
---
# JavaScript typeof operator
In this section we will learn what the typeof operator is and how to use it in JavaScript.
## What is typeof operator in JavaScript? (JavaScript Check Type )
Sometimes we need to know the current type of the value that is stored in a variable.
This is where we can use the `typeof` operator.
We put the name of the variable on the right side of this operator and it will return us the type of the value that is stored in that variable.
## How to use typeof operator in JavaScript? (typeof operator syntax)
This is how we can use the typeof operator in JavaScript:
``` line-numbers
Typeof variableName;
typeof value;
```
## Example: using typeof operator in JavaScript
``` line-numbers
JS is fun :)
```
Note that, calling a variable will actually return a copy of its value and so here the `typeof` operator in fact is checking the value that is stored in each variable.
## Example: applying typeof operator on String in JavaScript
``` line-numbers
JS is fun :)
```
We can also store the returned value of the `typeof` operator in a variable.
## Example: typeof operator in JavaScript
``` line-numbers
JS is fun :)
Output:
number
string
```
As you can see, in the first statement, the `typeof 10;` returned `number` as the type of the value `10`. But in the second statement `typeof num;`, the returned value is `string`.
## Example: applying typeof operator on Object in JavaScript
``` line-numbers
JS is fun :)
Output:
object
```