Free Email Validation JavaScript Widget

Email

✘

Need real-time email validationⓘ for your forms?

The ZeroBounce JavaScript widget is a plug-and-play email validationⓘ and verification tool designed for websites without server-side capabilities. Customize the widget to fit your form, copy and paste it, and automatically check email signups.

Try it free – create a free ZeroBounce account today and get access to the JavaScript widget along with 60+ unique integrations!

Get 100 credits free monthly when you sign up with a business/premium domain.

ZeroBounce JavaScript widget features

Real-time email validationⓘ checks for front-end users

Can’t access the back end when using drag-and-drop builders like Unbounce or Instapage?

The free ZeroBounce JavaScript widget allows you to copy and paste our email validationⓘ tool into your forms with minimal setup. Follow our easy-to-use guide to set up the necessary fields, paste the widget, and check incoming email signups in real time.

Example of a valid email signup

Example of a valid email signup

Domain-specific validation

Create a unique API key bound to your desired website domain. To prevent fraud or form abuse, the JavaScript widget will only check emails entered on your website.

Customizable email validationⓘ rules

The JavaScript widget includes easy-to-use setup options on your dashboard. Check the box next to the email types you consider “valid,” and we’ll automatically block the rest. The detectable email categories include:

• Valid
• Invalid
• Catch all
• Unknown
• Spamtrap
• Abuse
• Do not mail

Throttle rules to prevent spam and abuse

Don’t waste your email checks on bots and bad actors. Customize your throttle limits and set the JavaScript widget to allow or block future form entries for the next 24 hours.

Customize your email verification message

Use the built-in prompts to create customized “valid” and “invalid” email messages that appear depending on the result. Help your users understand the error and show them how they can provide accurate data.

Block invalid emails or record incoming signups

The JavaScript widget provides two easy options to protect your database and mailing list:

• Automatically block all email types you select as “invalid”
• Allow all signups and record those entries for further data analysis

How to use the email validationⓘ JavaScript widget

To use our free JavaScript email checker, you’ll just need two things:

• A website page with a form that includes an email type field with the class: zb email
• A free ZeroBounce account to access the JS widget

Then, add the JavaScript code snippet to your form in a few simple steps:

• Enter your domain and generate a new API key.
• Customize your rules: select your approved email types, set up your throttle rules, and customize your messages.
• Finally, copy and paste the code into the front end of your website to enable email validationⓘ!

Turn this…

Into this!

For in-depth instruction and explanation of the ZeroBounce JavaScript widget rules, check out our official documentation.