Custom HTML5 Form Validator – native-validations
native-validations is a JavaScript library to enhance and replace the native HTML5 form validation with custom styles and error messages.
JavaScript & CSS form validation
Custom HTML5 Data Validation
A small form validation script that automatically highlights invalid form fields and displays custom error messages using HTML5 validation attributes.
Customizable Form Validator With Native JavaScript – js-form-validator.js
An easy-to-use yet fully customizable form field validator built using native JavaScript with no 3rd JavaScript libraries.
Vanilla JavaScript Form Validator For Bootstrap Framework
A vanilla JavaScript plugin that adds the form validation functionality to your Bootstrap project without any 3rd JS libraries.
Minimal Form Validation Popup In Pure JavaScript – popup-validation
A lightweight, ES5/ES6 JavaScript library to validate form fields and display error messages in a popup when invalid.
Custom HTML5 Form Validation Library – Ok.js
Ok.js is a lightweight JavaScript form validation library that makes it easy to create custom validation rules and error messages to form fields.
Custom HTML5 Form Validator In Vanilla JavaScript – Just-validate
Just-validate is a dependency-free, HTML5 data attribute based form validation that supports both client side and server side form validation.
Minimal HTML5 Form Validation Library – okjs
okjs is a JavaScript library used to extend the HTML5 form validation api that supports custom field validation rules & error messages.
Minimal Credit Card Input Validation Library – creditCardValidator.js
A minimal, vanilla JavaScript credit card validator that has the ability to check & validate the credit card number, expiration Date and CVV.
Basic Form Validation JavaScript Library – dakrajs
dakrajs is a pure JavaScript library used for validating form fields with custom error messages on submit.