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.
JavaScript & CSS form validation
Concise Form Validator In Vanilla JavaScript – formvalidatorjs
formvalidatorjs is a lightweight, unobtrusive form validator written in vanilla JavaScript that works with the native HTML5 data validation.
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 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.
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.
Validating and Formatting Credit Card Inputs with Payment.js
Payment.js is a standalone Javascript library for E-commerce or business websites that helps you validate and format credit card form elements.
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.