How to Validate an Email Address in JavaScript

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by Abdul Rawoof A R dot icon Updated: Feb 4, 2024

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Validation is checking the values entered by users. The application's client side ensures it only transfers accurate data to the server.

We can confirm email, password, date, and mobile numbers. Email validation in JavaScript is essential for a web application's user experience. A crucial aspect of verifying an HTML form is email validation. The '@' symbol divides an email into two parts. The person's identity is in the first part. A domain name in the other part registers the email. JavaScript uses regular expressions to confirm email on the client side of a web application. You can do it by following steps: 

  • Define a regular expression for validating email address  
  • Check if the input value matches with regular expression  
  • If it does match, send a message saying, "valid email address."  
  • If it does not match, send a message saying, "invalid email address."  

Here is an example of how you can validate an email address using JavaScript for your application: 

Fig 1: Preview of the output that you will get on running this code from your IDE.



Follow the steps carefully to get the output easily.

  1. Install Visual Studio Code IDE on your computer.
  2. Create a new HTML file.
  3. Copy the code using the 'Copy' button and create an HTML tag then paste the code inside the tag into that HTML file.
  4. Then keep the function lines inside the script tag(refer to preview as well).
  5. Save and run the file directly from the file location to generate the output.

I found this code snippet by searching for 'js email validation' you can try any such use case!

Environment Tested

I tested this solution in the following versions. Be mindful of changes when working with other versions.

  1. The solution is created in Visual Studio Code 1.73.1.

Using this solution, we are able to validate an email address using javascript with simple steps. This process also facilities an easy way to use, hassle-free method to create a hands-on working version of code which would help us to validate an email address using javascript.


1. What is email validation, and why is it important for a web application? 

Email validation ensures that users enter accurate, formatted email addresses. A web application must receive correct data to prevent errors and improve user experience. 


2.How does email validation work in simple terms? 

Email validation checks if the email entered follows the basic structure. An email must have a username and a domain name separated by '@'. This helps in confirming that the email provided resembles a typical email address. 


3.Why is JavaScript used for email validation on the client side? 

The client side uses JavaScript to confirm emails. It also provides immediate feedback to users without needing to submit the form. It enhances user experience. It catches potential errors before data reaches the server. 


4.What happens if the email validation fails? 

If the email validation fails, the user will receive a message stating that the email address is invalid. This prompt helps users correct their input before submitting the form. It reduces the likelihood of errors. 


5.Is email validation the only type of validation in web applications? 

No, web applications often confirm various types of user inputs. These include passwords, dates, and mobile numbers. Validation ensures that the data submitted is accurate. It also ensures that the data meets the required criteria for processing on the server side. 


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