How to check if a string ends with another string using vanilla JS

Yesterday, we looked at how to check if a string starts with another string using vanilla JS. Today, we’re going to learn how to check if a string ends with a substring instead.

Let’s dig in.

The String.endsWith() method

Let’s say you have a string, and you want to check if it ends with universe.

You can use the String.endsWith() method to do that. Call it on the string you want to test and pass in the string you want to check for. It will return a boolean (true/false).

Here’s an example.

// The string
var str = 'Hello universe';

// Check if the string ends with "universe"
// returns true
str.endsWith('universe');

The String.endsWith() method is case-sensitive. If you checked for Universe in the example above, it would return false instead of true.

// Check if the string ends with "Universe"
// returns false
str.endsWith('Universe');

Checking for a specific end position

You can optionally pass in a second argument, position. If you do, the endsWith() method will check if that’s the index in the string that the substring ends at

// returns false
str.endsWith('uni');

// returns true
str.endsWith('uni', 9);

Browser compatibility

This works in all modern browsers, but not IE. You can polyfill it back to at least IE6.