Is validate.js better than Yup for form validation?

validate.js is better for simple, client-side validation in vanilla JavaScript projects, especially if you need IE6 support or a dependency-free library. Yup excels in complex schema validation and integrates more smoothly with modern frameworks like Formik or React Hook Form.

How do I add a custom validation rule in validate.js?

You can add custom rules by providing a callback function in the validation configuration array. The callback should return true for valid inputs and false for invalid ones, and you can pair it with custom error messages—check the external documentation for detailed examples.

Does validate.js work with React?

Yes, but it requires manual integration since it's a vanilla JavaScript library. You'll need to handle form events and error display within React's state, unlike validation libraries specifically designed for React that offer hooks and components.

What browsers does validate.js support?

validate.js supports all major browsers, including legacy versions like IE6, as explicitly stated in the README. This makes it a solid choice for projects that must maintain compatibility with older browser environments.

Can I use validate.js with jQuery?

Yes, there is a jQuery plugin available (https://github.com/magizh/validate_helper) that simplifies integration, making it easier to bind validation to form elements and handle errors in jQuery-based projects.

Is validate.js actively maintained?

The main repository shows limited recent activity, and the documentation is hosted externally, suggesting it may not be actively updated. Forks and plugins exist, but for critical applications, consider more actively maintained alternatives like VeeValidate or Joi.

Open-Awesome

validate.js

NOASSERTIONJavaScriptv1.5.1

A lightweight JavaScript form validation library inspired by CodeIgniter, with no dependencies.

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2.5k stars398 forks0 contributors

What is validate.js?

validate.js is a lightweight JavaScript library for client-side form validation, inspired by the CodeIgniter PHP framework. It allows developers to validate form fields against a variety of rules without any external dependencies. The library solves the problem of ensuring data integrity in web forms before submission, reducing server-side validation overhead.

Target Audience

Frontend developers and web designers who need a simple, dependency-free solution for client-side form validation in their projects.

Value Proposition

Developers choose validate.js for its minimal footprint, ease of use, and flexibility—it offers a familiar API for those coming from CodeIgniter, supports custom rules, and works across all major browsers including legacy ones.

Overview

Lightweight JavaScript form validation library inspired by CodeIgniter.

Use Cases

Best For

Adding client-side validation to simple web forms without heavy dependencies
Projects requiring cross-browser compatibility, including legacy IE support
Developers familiar with CodeIgniter seeking a similar validation API in JavaScript
Lightweight applications where bundle size is a critical concern
Extending validation with custom rules and callbacks
Quick prototyping with minimal setup and configuration

Not Ideal For

Modern single-page applications using React or Vue that require seamless framework integration
Projects needing advanced validation features like async validation or complex schema-based rules
Teams prioritizing actively maintained libraries with regular updates and modern documentation
Applications where validation logic is deeply integrated with state management systems

Pros & Cons

Pros

No Dependencies

Works standalone without requiring external libraries, minimizing bundle size and simplifying setup, as explicitly stated in the README.

Legacy Browser Support

Functions in all major browsers including IE6, making it ideal for projects that must support older browsers, a key feature highlighted in the documentation.

Extensible Rule System

Provides over a dozen built-in rules and allows custom validation callbacks, offering flexibility for various use cases, as mentioned in the features list.

CodeIgniter-Inspired API

The API is modeled after CodeIgniter's form validation, easing adoption for developers familiar with that PHP framework, as noted in the README.

Cons

Outdated Documentation

The README directs users to an external site (http://rickharrison.github.com/validate.js) for full documentation, which may be broken or not updated, indicating poor maintenance and accessibility issues.

Verbose Configuration

Validation rules are defined using arrays of objects, which can become cumbersome and less intuitive for complex forms compared to modern declarative approaches like Yup or Joi.

Limited Modern Features

Lacks support for contemporary validation needs such as async validation, schema-based validation, or built-in integration with frontend frameworks, as evident from its simple, synchronous rule system.

Frequently Asked Questions

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