JavaScript String substring() Method

Last Updated : 17 Mar 2025

The JavaScript string substring() method fetch the string on the basis of provided index and returns the new sub string. It works similar to the slice() method with a difference that it doesn't accepts negative indexes. This method doesn't make any change in the original string.

Syntax

The substring() method is represented by the following syntax:

Parameter

start - It represents the position of the string from where the fetching starts.

end - It is optional. It represents the position up to which the string fetches.

Return

Part of the string.

JavaScript String substring() Method Example

Let's see some simple examples of substring() method.

Example 1

Let's see a simple example to print the part of the string.

Output:

Example 2

In this example, we will fetch single character from the string.

Output:

Example 3

In this example, we will provide only the starting index.

Output:

Example 4

In this example, we will not pass any parameter with the method. In such case, the method returns the complete string.

Output: