JavaScript can make your website dynamic, but too much unused JS can slow it down, hurt SEO, and frustrate users.

Want a faster, high-performing website? Learn how to find and remove unused JavaScript with these easy techniques!

🔍 How to Use Chrome DevTools Coverage Tab to Detect Unused JavaScript

Chrome DevTools has a powerful feature to analyze code usage—the Coverage Tab. Here’s how you can use it:

Open Chrome DevTools: Press F12 or Ctrl + Shift + I (Windows/Linux) or Cmd + Option + I (Mac).

Go to the Coverage Tab: Click on the three-dot menu in DevTools → "More tools" → "Coverage."

Start Recording: Reload the page and observe the coverage results.

Analyze the Results: You’ll see a list of JavaScript and CSS files, along with used (%) and unused code.

Remove Unused Code: Identify scripts that are loading but not being used, then remove or optimize them.

💡 Pro Tip: Check out Google's official guide on optimizing JavaScript for more details!

⚠️ Removing Third-Party Scripts Safely

Many websites load third-party scripts (e.g., analytics, chat widgets, ads) that slow down performance. Removing them recklessly can break functionality. Here’s how to do it safely:

✅ Audit Third-Party Scripts: List all external scripts (Google Tag Manager can help).

✅ Check Usage: Use DevTools or tools like RequestMap to see script dependencies.

✅ Lazy Load Scripts: Only load scripts when needed using the defer or async attributes.

✅ Self-Host Where Possible: Instead of loading scripts from third-party sources, download and serve them from your own server.

🔗 Resource: Learn how to defer JavaScript for better performance: web.dev/defer-non-essential-js

🛠️ Best Tools for Detecting and Removing Unused Code

Several tools help automate the process of finding and removing unused JS. Try these:

PurifyCSS: Helps eliminate unused CSS & JS (purifycss.online)

Webpack Tree Shaking: Optimizes your JavaScript bundle by removing dead code (Webpack Docs)

UnCSS: Scans your HTML & removes unnecessary CSS/JS (uncss GitHub)

Lighthouse: Google’s performance tool that flags unused JavaScript (Run Lighthouse)

🔹 Bonus: Learn how Webpack tree shaking works with this hands-on guide: webpack.js.org/guides/tree-shaking

🚀 Make Your Website Faster Today!
Unused JavaScript is slowing down your website and affecting SEO! By following these steps, you’ll:

✅ Improve page load speed
✅ Boost Core Web Vitals
✅ Enhance user experience
✅ Rank higher in search results

🔹 Have you tried removing unused JavaScript? Share your experience in the comments! Let’s discuss the best strategies to improve website performance.

🔗 Need help optimizing your website? DCT Technology Pvt Ltd can assist with performance audits and IT consulting!

📢 Tag a developer who needs to see this! Let’s build faster, better websites together. 🚀

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