How to Remove a Trailing Slash From a String in JavaScript?

In JavaScript, you can remove trailing slashes from a string in the following ways:

• Using endsWith();
• Using a Regular Expression With replace();
• Using Bracket Notation;
• Using substr();
• Using charAt();

Using endsWith()

Introduced in ES6, you can use endsWith() to see if the string ends with a trailing slash, and accordingly you can remove it. For example:

// ES6+
str.endsWith('/') ? str.slice(0, -1) : str;
str.endsWith('/') ? str.substr(0, str.length - 1) : str;

Using a Regular Expression With replace()

Regular expressions are very well-supported across all browsers (new and old). You can use a regular expression with str.replace() to remove a trailing slash without the need to first explicitly check if a trailing slash exists and then remove it (as in the other methods). Also, this may be a choice, if you're looking for a one-liner. For example:

str.replace(/\/$/, '');

Using Bracket Notation

You can use the bracket notation to access the last character of the string and then replace it accordingly like so:

(str[str.length - 1] === '/') ? str.slice(0, -1) : str;
(str[str.length - 1] === '/') ? str.substr(0, str.length - 1) : str;

Using substr()

This method has great browser support. If backward compatibility is of concern, then you may want to consider this approach of checking and removing a trailing slash from a string. For example:

(str.substr(-1) === '/') ? str.slice(0, -1) : str;
(str.substr(-1) === '/') ? str.substr(0, str.length - 1) : str;

Using charAt()

Similar to substr(), this method too has great browser support. If backward compatibility is of concern, then may consider this approach of checking and removing a trailing slash from a string. For example:

(str.charAt(str.length - 1) === '/') ? str.slice(0, -1) : str;
(str.charAt(str.length - 1) === '/') ? str.substr(0, str.length - 1) : str;