10 Best Pure JavaScript Form Validation Libraries (2024 Update)

The native HTML5 validation feature is not enough.

We also recommend you use a JavaScript library to extend and enhance the default form validation functionalities for better user experiences on modern web design.

In this post, you’ll find a list of the 10 best and most downloaded JavaScript Form Validation libraries (without any 3rd dependencies such as jQuery) to validate your HTML form with custom error messages, CSS styles, validation rules, and more. Enjoy.

Originally Published Feb 10, 2018, updated Jan 07 2024

1. validator.js

validator.js

[Demo] [Download]

Lightweight JavaScript form validation, that had minimal configuration and felt natural to use. No dependencies, support UMD.


2. Just-validate

Just-validate

Demo Download

Just-validate is a dependency-free, HTML5 data attribute based form validation that supports both client side and server side form validation. Validation rules are fully customizable via JavaScript. Compatible with Bootstrap framework.


3. Pristine

Minimal HTML5 Form Validator In Vanilla JavaScript - Pristine

Demo Download

Pristine is a lightweight vanilla JavaScript form validation library which works with the native HTML5 attributes and allows you to create your own validators of course.


4. Regex Based Form Validator For Bootstrap 5

Regex Based Form Validator For Bootstrap 5

Demo Download

A script that demonstrates how to validate form fields in your Bootstrap 5 project by using custom Regex.


5. Bouncer.js

Extend HTML5 Form Validation With Custom Rules And Errors - Bouncer.js

Demo Download

The Bouncer.js JavaScript library is created to extend the native HTML5 form validation that enables the customizable form validation on the form fields.


6. Validator.js

Fast User-friendly Form Validation Plugin – Validator.js

[Demo] [Download]

A fast, cross-browser, user-friendly, highly customizable form validator that works with the native HTML5 input types: text, email, url, date, etc.


7. Native Validator

Bootstrap Form Validation Library Without jQuery – Native Validator

[Demo] [Download]

A vanilla JavaScript-powered form validation library for the latest bootstrap framework, without jQuery dependency.


8. Vanilla JavaScript Form Validator For Bootstrap 5/4/3 Framework

Vanilla JavaScript Form Validator For Bootstrap 5/4/3 Framework

[Demo] [Download]

A vanilla JavaScript plugin that adds extensible form validation functionalities to your Bootstrap project without third-party JS libraries like jQuery.


9. popup-validation

Minimal Form Validation Popup In Pure JavaScript – popup-validation

[Demo] [Download]

A lightweight, ES5/ES6 JavaScript library to validate form fields and display error messages in a popup when invalid.


10. OctaValidate

Feature-rich Form Validation Library – OctaValidate

[Demo] [Download]

An important aspect of user experience in modern websites. Good validation helps to improve conversions, especially in a contact form. In many cases, when the user encounters a validation error page, they will lose interest and not complete the form — even if they are interested in your products and services.


More Resources:

Looking for more JavaScript solutions to validate form fields on modern web applications? Here are some resources you might find useful:

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