Javascript Trim String

Javascript is a scripting or programming language, which is used both on the client-side and back-end of the web. Just like any other language, strings are an important type of the variables, and we often need to manipulate or alter strings as per our needs. While getting data from the user in the form fields, a programmer has to take care of a lot of things. In this article, we will have a look at javascript’s trim() function. We will learn how this function helps in beautifying the strings in javascript and how can we get rid of extra spaces. So, let’s take a look at what is a string and how we can trim the strings.

The string is a simple text or characters which can include the alphabets, numbers, or symbols.

Javascript’s trim() method trims the extra white space from both sides of the strings. Extra white space can be space or tab, etc.


Syntax for the trim() method is as follows:


In javascript’s trim string method, we simply call the function over a string, and it trims the string into a clean, space free string. This function doesn’t take any arguments.

Let’s try some examples and understand it.


First, we suppose a string and add some extra white space around the string.

let str = "   Linuxhint!   "

Now, to get rid of the extra white spaces from both sides, we try to apply the trim() method over that string and see how it works.


We can see in the output that the string is trimmed and there is no extra whitespace left around the string as we desired it to happen.

Now, a question arises: what if we want to trim the string from only the left side or the start of the string and vice versa. There is a built-in function for that as well. There are two different trimStart() and trimLeft() functions, but these both do the same task. So, if we want to trim the string from the left side only and want to keep the whitespaces on the right side. We can use the trimStart() or trimtrimLeft() function.



As you can see that both functions do the same task and trim the strings from the left side only.

Similarly, if we want to trim the string from the last or the right side only. We can use any of the trimEnd() or trimRight() functions.



It is observed that the string is trimmed only from the right side, as we expected.

So, this is how the javascript’s built-in functions trim(), trimStart(), trimLeft(), trimEnd() and trimRight() works and helps us in getting rid of the extra whitespace around the string.


In this article, we have learned about javascript’s built-in string trim() function and see it’s various implementations. We have also learned about the trimStart() and trimEnd() functions. This article includes profound and explained in-depth knowledge, the need, and the usage of the javascript’s string trim function. So, keep on learning javascript with

About the author

Shehroz Azam

A Javascript Developer & Linux enthusiast with 4 years of industrial experience and proven know-how to combine creative and usability viewpoints resulting in world-class web applications. I have experience working with Vue, React & Node.js & currently working on article writing and video creation.