JavaScript Minifier

Minify your JavaScript code for faster loading

Original JavaScript 0 chars

// Function to calculate factorial
function calculateFactorial(number) {
    if (number < 0) {
        console.error("Factorial is not defined for negative numbers");
        return null;
    }
    
    if (number === 0 || number === 1) {
        return 1;
    }
    
    let result = 1;
    for (let i = 2; i <= number; i++) {
        result = result * i;
    }
    
    return result;
}

// Event handler for button click
document.addEventListener('DOMContentLoaded', function() {
    const calculateButton = document.getElementById('calculate-btn');
    const inputField = document.getElementById('number-input');
    const resultDisplay = document.getElementById('result');
    
    if (calculateButton && inputField && resultDisplay) {
        calculateButton.addEventListener('click', function() {
            const inputValue = parseInt(inputField.value);
            
            if (isNaN(inputValue)) {
                resultDisplay.textContent = "Please enter a valid number";
                resultDisplay.style.color = "#dc2626";
                return;
            }
            
            const factorial = calculateFactorial(inputValue);
            
            if (factorial !== null) {
                resultDisplay.textContent = `Factorial of ${inputValue} is: ${factorial}`;
                resultDisplay.style.color = "#16a34a";
            }
        });
    }
});

Minified Output 0 chars

0 B

Original

0 B

Minified

0 B

Saved

Reduction

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About

The JavaScript Minifier is a powerful web-based tool designed to optimize your JavaScript code for superior website performance. It reduces file size by removing unnecessary characters, whitespace, and comments while preserving functionality. This professional-grade tool helps developers decrease load times, improve SEO rankings, and enhance user experience through efficient JavaScript optimization.

How to Use

Paste Your JavaScript – Copy your JS code into the “Original JavaScript” textarea

Configure Options – Select optimization preferences using the checkboxes

Click Minify – Press the “Minify JS” button to process your code

Test Execution – Use the “Test” button to verify code functionality

Copy Result – Get your optimized code with the “Copy” button

Review Statistics – Check compression metrics in the stats panel

Features

✅ Comment Removal – Strips single-line (//) and multi-line (/* */) comments

✅ Whitespace Optimization – Eliminates unnecessary spaces, tabs, and line breaks

✅ Variable Name Mangling – Shortens long variable names for size reduction

✅ Debug Statement Removal – Optional removal of console.* and debugger statements

✅ Boolean Simplification – Converts true → !0 and false → !1

✅ Safe Minification – Preserves all JavaScript functionality and logic

Faqs

Is my JavaScript code secure?

Absolutely! All processing occurs locally in your browser. No code is uploaded to servers or stored anywhere.

Will minification break my JavaScript?

The tool uses safe optimization techniques. However, always test minified code before deployment, especially when using “Shorten Variables” option.

How much compression can I expect?

Typically 30-50% reduction, depending on your code structure. Well-commented code with descriptive variable names sees the biggest savings.

What about JavaScript frameworks (React, Vue, Angular)?

Works with all frameworks, but test thoroughly as some frameworks have specific requirements.

Can I minify Node.js code?

Yes, but note that Node.js-specific modules won’t execute in the browser test console.