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.
JavaScript & CSS form validation
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.
Basic Form Validation JavaScript Library – dakrajs
dakrajs is a pure JavaScript library used for validating form fields with custom error messages on submit.
Simple Custom Form Validation JavaScript Library – JSFormValidation
A simple and fast JavaScript library that provides client side validation with custom error messages and validation rules for html forms.
Minimal Form Validation Library – FormValidation
FormValidation is a very lightweight JavaScript library that provides basic client side form validation with custom error messages on submit.
Simple Inline Form Validator with Pure Javascript
An easy-to-use form validator which enables you to validate a set of form controls in vanilla JS.