JN Form Validation: Simplify Client-Side Validation with Ease

Validating user input is one of the most crucial aspects of modern web development. Poor validation not only impacts user experience but also creates security concerns. That’s why I built JN Form Validation — a simple, efficient, and developer-friendly JavaScript library for handling client-side form validation.

Whether you’re just starting out or have been developing web applications for years, JN Form Validation is designed to make form validation easy, fast, and customizable.

🔍 What is JN Form Validation?

JN Form Validation is a lightweight JavaScript library built to simplify form validation on the client side. With no dependencies, real-time validation, and an easy-to-use API, this tool offers developers a streamlined approach to handling input validation across various HTML5 input types.

🔑 Key Features:

• Fully Customizable
  Tweak behavior and appearance with ease. You can define your own error messages or use the built-in defaults.

• Real-Time Validation
  Get instant feedback as users fill out form fields.

• Cross-Browser Support
  Works seamlessly across modern browsers using ES6+ syntax.

• Dynamic Error Messages
  Configurable error messages with dynamic field-specific content.

• Lightweight and Fast
  Optimized performance with a minimal footprint and zero dependencies.

🧩 How to Use JN Form Validation

Setting up JN Form Validation is quick and straightforward. Just follow these simple steps:

✅ 1. Include CSS and JS

Add these two CDN links to your HTML page:

<!-- CSS -->
<link rel="stylesheet" href="https://cdn.jsdelivr.net/gh/chauhan07/jn-formvalidation/code/assets/css/jn-formvalidation.min.css">

<!-- JavaScript -->
<script src="https://cdn.jsdelivr.net/gh/chauhan07/jn-formvalidation/code/assets/js/jn.formvalidation.min.js"></script>

✅ 2. HTML Form Markup

Structure your form fields like this:

<form action="" class="jnForm">
  <label class="jn-input-wrap">
    <input type="text" placeholder="Enter your name">
  </label>
  <label class="jn-input-wrap">
    <input type="email" placeholder="Enter your email">
  </label>
  <label class="jn-input-wrap">
    <input type="tel" placeholder="Enter your phone number">
  </label>
  <label class="jn-input-wrap">
    <textarea placeholder="Enter your message"></textarea>
  </label>
  <label class="jn-input-wrap">
    <input type="submit" value="Submit">
  </label>
</form>

💡 Just wrap each input in an element with the .jn-input-wrap class — that’s it!

✅ 3. Initialize the Library

Put following JS code in HTML

const jn_validation = new JnFormValidation({
  showErrorMessages: true,
  formClass: '.jnForm',
  errorMessages: {
    text: "Please enter some text.",
    email: "Please enter a valid email address.",
    tel: "Please enter a valid phone number.",
    textarea: "Please enter some text.",
  }
});

You can omit the errorMessages object if you prefer to use default messages.

📃 Full List of Error Messages

Here are all the supported input types with their default error messages:

errorMessages: {
    email: "Please enter a valid email address.",
    text: "Please enter some text.",
    password: "Please enter a valid password.",
    textarea: "Please enter some text.",
    tel: "Please enter a valid phone number.",
    number: "Please enter a valid number.",
    checkbox: "This option must be checked.",
    radio: "Please select an option.",
    select: "Please select an option.",
    file: "Please upload a valid file.",
    search: "Please type for search",
    url: "Please enter a valid url",
    date: "Please enter a valid date.",
    time: "Please enter a valid time.",
    datetimeLocal: "Please enter a valid date and time.",
    month: "Please enter a valid month.",
    week: "Please enter a valid week.",
    range: "Please enter a valid range.",
    color: "Please select a color."
  }
});

🔗 Helpful Resources

Want to learn more? Here are some valuable resources to help you get started:

🔹 Main Page
🔹 Live Demo
🔹 Installation Guide
🔹 All Init Options
🔹 Download ZIP

🎯 Why Choose JN Form Validation?

• No need to use heavy libraries like jQuery.

• Built for speed and performance.

• Customizable for any use case — simple or complex.

• Great for portfolios, contact forms, admin panels, and more.

✅ Conclusion

If you’re looking for a fast, lightweight, and beginner-friendly solution to handle client-side form validation, JN Form Validation is worth a try. It reduces development time, improves user experience, and keeps your forms clean and functional.

Give it a go and simplify your next web project’s form validation!