Page Auditor for Technical SEO

Page Auditor for Technical SEO is an open source free_Google Chrome Extension_ created by Franco Folini to explore and analyze the main on-page technical SEO features of any web page.

Purpose

Page Auditor is a free Microsoft Edge and Google Chrome Extension based on open source code. It can be installed on any Microsoft Edge or Google Chrome browser and used to explore and audit the content of any webpage. The goal is to make the On-Page Technical SEO Analysis an effective and easy tool for everybody, and in particular for non technical people.

Performing a On-Page Technical SEO Analysis requires analyzing several (almost) hidden elements of an HTML page, including Meta Tags, Structured Data, JavaScrips, Robots.txt and Sitemap.xml files. It can be a challenging task, in particular for people without a strong technical background. Many of these elements are important for the page SEO performance. Page Auditor makes it easy to check all these elements. It can be used to analyze our own web pages, as well as our competitors' pages.

Page Auditor automatically scans the HTML code of the selected page to locate specific HTML elements, like <script> and <meta> tag elements. Then it extracts the relevant content and attributes of each tag and classifies them according to manually-curated internal lists of categories. The result of the analysis is then presented to the user in clear, well formatted, human readable reports. Compared to a manual analysis of the same page, the benefits are evident. For example, the JSON-LD and the JavaScript code included in a page provide critical information about the page, but they are frequently compressed and almost unreadable for humans. In fact they are intended to provide information to the browser and to the search engin crawlers visiting the page.Page Auditor takes care of making this information accessible by properly formatting the code and the content of these items and providing detailed information about the meaning and use of each one ofg them.

Features

Structured Data Report

JavaScript Code Report (Tracking, Analytics, Ads)

Meta Tags Report

Robots.txt & Sitemap.xml Report

HTML Report

To-Do Report

License

This Google Chrome Extension is open source and it is released under BSD-3-Clause license.

Running the Live Version

Testing the live version of Page Auditor, the version publicly available on the Microsoft Edge Add-ons Store and on the Google Chrome Web Store, is very simple. Visit the Page Auditor for Edge page on Edge Add-ons or the Page Auditor for Chrome page on Google Chrome Store and follow the instructions to start the installation. Once you installed the extension, visit a web page you would like to analyze and start the extension from the Extensions Menu on the top right corner of your browser.

Page Auditor on Microsoft Edge Add-ons Store and Google Chrome Web Store

Testing a New Version on Chrome

This is how to test the Extension or any variation opf it on your Google Chrome Web Store (the process for Microsoft Edge is similar):

Make sure the file package.json define the build target as "Chrome". Line of the file should be: "target": "Chrome", if you are building for Chrome, and "target": "Edge", if you are building for Edge.
Generate a new build with the command npm run build
Open the Google Chrome Extensions page on your browser by entering the following URL: chrome://extensions/
Select the [Load Unpacked] button on the top left corner of the page.
When the [Select Folder] panel opens, navigate your computer file system and select the /dist folder of the extension.
Now you can run your local copy of the extension by clicking on the extension icon on the top right corner of your Google Chrome browser. If you don't see the Extensions logo on the browser corner, select the extensions icon and pin the PageAuditor extension to the main toolbar.
To test new changes (fresh files are in the ./dist folder) click the refresh icon on the Extension box in the same chrome://extensions/ page.

Testing the Code

There is a battery of tests implemented with jest. At the moment, September 2021, the tests are covering 100% of Statements and Functions.

File	% Stmts	% Branch	% Funcs	% Lines	Uncovered Line #s
All files	100	96.02	100	100
src	100	100	100	100
- card.ts	100	100	100	100
src/sections	100	95.98	100	100
- credits.ts	100	100	100	100
- intro.ts	100	100	100	100
- ld-json-functions.ts	100	84.21	100	100	33-60
- ld-json.ts	100	100	100	100
- meta-functions.ts	100	98.1	100	100	61,93
- meta.ts	100	94.74	100	100	28-33
- robots-functions.ts	100	100	100	100
- robots.ts	100	100	100	100

Run npm run test-coverage to generate the tests coverage report. The report will be available at coverage/lcov-report/index.html

Formatting the Code

To format the code with Prettier run npm run format.

Additional Information

This extension is based on a Google Chrome Snippet I described in an article I published on Medium on May 14, 2021. The article's title is Exploring Structured Data With A Google Chrome Snippet. Since the initial idea and implementation the extension has been growing significantly including more analysis and brand new reports.
On September 16, 2021 I published an article on Medium for a non-technical audience describing the features and the usage of the Page Auditor Chrome Extension. The article's title is I wrote a Chrome Extension to perform on-page SEO analysis.

All information and creative required to publish the Google Chrome eExtension are available on the folder Google Web Store creative material.

Roadmap

Porting the snippet from JavaScript to TypeScript

Transform the Google Chrome Snippet into a regular Google Chrome Extension
Porting the Extension to the Microsoft Edge browser / platform
Highlighting of images missing the alt attribute or failing download
Reorganize the user interface with a summary and links to each section. No more tabs.
Add more SEO features, like

folini/Page-Auditor