PageLens — One-Click Page Audit Tool

Comprehensive one-page audit tool for any webpage. Click the PageLens icon on any page to get health scoring (0-100), SEO, accessibility, technology detection, security, performance, and link analysis — all in one clean popup. Free + $5 donation checkout.

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Features

• Overview — Overall health score (0-100), quick stats grid, top issues
• Performance — Page weight, request count, resource breakdown, timing metrics
• SEO — Title/description validation, heading structure, image alt text audit, canonical/robots
• Accessibility — Missing alt text, form labels, heading hierarchy, buttons without text, skip links, lang attribute
• Technology — Detects 28 technologies (React, Vue, Angular, jQuery, WordPress, Shopify, etc.)
• Security — HTTPS check, mixed content, insecure forms, security headers
• Links — Total/internal/external/nofollow/new-tab counts with full listing

Install (Developer Mode)

1. Open Chrome → chrome://extensions
2. Enable "Developer mode" (top-right toggle)
3. Click "Load unpacked"
4. Select the pagelens/ directory
5. The PageLens icon appears in your toolbar

Usage

1. Navigate to any webpage
2. Click the PageLens toolbar icon
3. View the health score and browse analysis tabs
4. Click "Export JSON" to download a full report

File Layout

pagelens/
├── manifest.json          # Chrome extension manifest (MV3)
├── background.js          # Service worker — message routing
├── popup.html             # Popup UI structure
├── css/popup.css          # Popup styles (dark header, card layout)
├── js/
│   ├── analyzer.js        # Content script — all page analysis logic
│   └── popup.js           # Popup interaction, tab rendering, export
├── icons/
│   ├── icon16.png         # 16x16 toolbar icon
│   ├── icon48.png         # 48x48 extensions page icon
│   └── icon128.png        # 128x128 Chrome Web Store icon
└── README.md              # This file

Technical Notes

• Pure vanilla JavaScript — zero dependencies
• Manifest V3 compatible
• All URL parsing guarded with try/catch
• Content script injection via chrome.scripting.executeScript
• Health score: starts at 100, deducts for issues found
• Technology detection: 28 signatures via DOM/window attribute checks