Extend HTML5 Form Validation With Custom Rules And Errors – Bouncer.js
The Bouncer.js JavaScript library is created to extend the native HTML5 form validation that enables the customizable form validation on the form fields.
JavaScript & CSS form validation
Validate Form Fields Using Regex And Required Attribute – Coriander
Coriander is a dead simple form validator used for validating form fields using Regex and required attribute.
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.
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.
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.
Payment (Credit Card) Form Generator With Input Validation – payform
payform is a JavaScript plugin to build and validate a credit card form on your eCommerce website.
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 – native-validations
native-validations is a JavaScript library to enhance and replace the native HTML5 form validation with custom styles and error messages.
Custom HTML5 Data Validation
A small form validation script that automatically highlights invalid form fields and displays custom error messages using HTML5 validation attributes.
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.