7 Best Pure JavaScript Form Validation Libraries (2020 Update)

The native HTML5 validation feature is not enough.

We also recommend you to 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 7 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 Mar 22 2020

1. validator

Fast User-friendly Form Validation Plugin - Validator.js

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

2. Bouncer.js

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

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

3. Pristine

Minimal HTML5 Form Validator In Vanilla JavaScript - Pristine

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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. Just-validate


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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.

5. valid-form


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ValidForm is a thin JavaScript wrapper on the HTML5 Form Validation features. It is very small at about 200 lines of code (7k, 5.6k compressed), and it has no dependencies.

6. js-form-validator.js


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An easy-to-use yet fully customizable form field validator built using native JavaScript with no 3rd JavaScript libraries.

7. Vanilla JavaScript Form Validator For Bootstrap Framework


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A vanilla JavaScript plugin that adds the form validation functionality to your Bootstrap project without any 3rd JS libraries.

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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