7 Best Pure JavaScript Form Validation Libraries For 2019

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 Jan 7 2019

1. Just-validate

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.


2. popup-validation

popup-validation

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Loaderplate is a simple, lightweight javascript library that uses SVG icons to generate an animated loading spinner on a given container.


3. okjs

Ok.js

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okjs is a JavaScript library used to extend the HTML5 form validation api that supports custom field validation rules & error messages. Without any 3rd dependencies.


4. js-form-validator.js

Customizable Form Validator With Native JavaScript – 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.


5. Custom HTML5 Data Validation

Custom HTML5 Data Validation

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A small form validation script that automatically highlights invalid form fields and displays custom error messages using HTML5 validation attributes.


6. native-validations

Custom HTML5 Form Validator – native-validations

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native-validations is a JavaScript library to enhance and replace the native HTML5 form validation with custom styles and error messages.


7. formvalidatorjs

Concise Form Validator In Vanilla JavaScript – formvalidatorjs

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formvalidatorjs is a lightweight, unobtrusive form validator written in vanilla JavaScript that works with the native HTML5 data validation.