Is Infinity a Data Type in JavaScript?


Angela Bailey

Is Infinity a Data Type in JavaScript?

When it comes to JavaScript, there are several data types that can be used to store and manipulate different kinds of values. These include numbers, strings, booleans, arrays, objects, and more.

However, you might be wondering if there is a data type for representing infinity in JavaScript. Let’s explore this topic further.

The Number Data Type

In JavaScript, numbers are represented by the number data type. This data type includes both finite and infinite values.

Finite values are regular numbers that can be positive, negative, or zero. On the other hand, infinite values represent numbers that are beyond any finite number.

The Infinity Property

To represent infinity in JavaScript, we can use the Infinity property. This property is a predefined value that represents positive infinity.

We can assign the Infinity value to a variable like this:

x = Infinity;

We can also perform arithmetic operations with Infinity. For example:

y = 10 / 0; // y will be Infinity

Negative Infinity

In addition to positive infinity, JavaScript also has a value called -Infinity, which represents negative infinity.

Detecting Infinity

If you want to check if a number is infinite in JavaScript, you can use the isFinite() function. This function returns false if the number is infinite and true otherwise.

isFinite(Infinity); // returns false

Alternatively, you can use the isNaN() function to check if a value is NaN (Not a Number), which includes both Infinity and certain other special numeric values.


In JavaScript, there is no specific data type for infinity. Instead, we can use the Infinity property to represent positive infinity and the -Infinity property to represent negative infinity. By understanding how to work with these values, you can handle scenarios where infinite numbers are involved in your JavaScript code.

Note: It’s important to handle infinite values carefully in your code to avoid unexpected behaviors and errors.

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