I Built a Free Tool to Analyze 15+ Site Metadata Files in One Scan

Source: Dev.to

The Problem

As developers, we constantly need to verify:

• Are my meta tags correct?
• Will my Open Graph preview look good on Twitter/LinkedIn?
• Is my robots.txt blocking the wrong pages?
• Does my sitemap include all important URLs?
• Is my JSON‑LD structured data valid?

Most tools only check one thing at a time. I wanted everything in one place.

What It Does

Enter a URL and get instant analysis of:

1. Basic Meta Tags

Title, description, keywords, viewport, charset — with character‑count validation.

2. Open Graph & Twitter Cards

See exactly how your site will appear when shared on social media.

3. Icons & Favicons

All your apple-touch-icons, favicons, and PWA icons in one view.

4. robots.txt Analysis

Parsed directives, sitemap references, and crawl rules at a glance.

5. Sitemap Discovery

Automatic sitemap detection with URL counts and structure overview.

6. JSON‑LD Structured Data

View and validate your schema.org markup.

7. Web Manifest

manifest.json analysis for app icons, theme colors, and display modes.

8. security.txt & llms.txt

Yes, we check those too—because details matter.

The Killer Feature: LLM‑Ready Exports

You can export all metadata as:

• JSON — for programmatic use
• Markdown — perfectly formatted for AI workflows

Open in AI with One Click

Export directly to Claude, ChatGPT, or Gemini. Perfect for:

• “Analyze this site’s SEO and suggest improvements”
• “Compare this metadata with competitor sites”
• “Generate a technical SEO audit report”

File Size Overview

At a glance, see the size of every file fetched. This helps identify bloated sitemaps, missing files, or oversized responses.

Built for Mobile Too

Fully responsive design that works great on any device. Check your site’s metadata on the go.

Tech Stack

For the curious developers:

• Next.js 15 — React framework with App Router
• Tailwind CSS — Utility‑first styling
• shadcn/ui — Beautiful, accessible components
• Cheerio — Server‑side HTML parsing

The entire app is open source.

What’s Next?

Features under consideration:

• Historical comparisons (track changes over time)
• Bulk URL analysis
• API access for CI/CD integration
• Browser extension

Let me know what you’d find useful!

One More Thing…

Need PWA icons for your project? I also built pwa-icons — generate all platform‑specific icons from a single image.

npx pwa-icons generate logo.png

It’s what I used to generate all the icons for Site Metadata Explorer itself.