Does minifying JS change how the code runs?

Terser keeps the program's behaviour, with one exception: if you turn on 'Drop console.*', console calls and their arguments are removed.

Can this minifier handle modern ES2022+ features?

Yes. Our parser supports modern ECMAScript features including arrow functions, destructuring, template literals, optional chaining (?.), and nullish coalescing (??).

Should I minify JavaScript before or after bundling?

Minification is typically performed as the final step of your production build process after bundling and tree-shaking.

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JavaScript Minifier

Minify JavaScript snippets safely in-browser.

Instant Results100% Client-Side Privacy100% Free Utility

JavaScript Minifier & Formatter

Minify modern JavaScript with Terser (ES2020+ syntax, modules, top-level await), optionally strip console calls, or beautify minified code with Prettier. Runs in your browser.

Quick Presets:

JavaScript Source Code1,043 bytes | 33 lines

/**
 * @license MIT - Calculate cart discount
 * Production utility for store checkout
 */
function calculateOrderTotal(items, discountPercent = 0, taxRate = 0.08) {
  // Debugging log for dev environment
  console.log("Processing " + items.length + " cart items...");
  
  if (!Array.isArray(items) || items.length === 0) {
    return { subtotal: 0, tax: 0, total: 0 };
  }

/* Compute running subtotal */
  let rawSubtotal = items.reduce((sum, item) => {
    return sum + (Number(item.price) || 0) * (Number(item.quantity) || 1);
  }, 0);

// Apply discount voucher if present
  let discountedSubtotal = rawSubtotal * (1 - (discountPercent / 100));
  let calculatedTax = discountedSubtotal * taxRate;
  let finalGrandTotal = Math.round((discountedSubtotal + calculatedTax) * 100) / 100;

// Final confirmation
  console.info("Order total calculated: $" + finalGrandTotal);
  debugger;

return {
    subtotal: rawSubtotal,
    discountAmount: rawSubtotal - discountedSubtotal,
    tax: calculatedTax,
    total: finalGrandTotal
  };
}

About JavaScript Minifier

Compress and minify JavaScript code by removing comments, whitespace, and formatting while preserving complete script functionality. Fast, secure, client-side JS compression.

Why Choose Our JS Minifier

Feature	Smart Toolverse	Others
Modern ES6+ Support	Full support for arrow functions, async/await, optional chaining & modules	Crashes on modern ES6+ syntax
Safe AST Parsing	Validates JavaScript AST before compression to prevent broken syntax	Crude regex replacing
Savings Analytics	Shows byte reduction and percentage compression metrics	No analytics
Client-Side Privacy	Code never leaves your browser RAM	Stores code on remote servers

Common Uses & Applications

Optimize production JavaScript bundles, reduce script download latency for mobile users, accelerate Core Web Vitals performance, and prepare lightweight JS snippets for embedding.

Frequently Asked Questions

Minification removes whitespace and comments to reduce file size while keeping logic intact. Obfuscation intentionally alters variable and function names into unreadable tokens to make reverse-engineering difficult.