Website review jeroenjanssens.com
Jeroen Janssens
Generated on May 04 2026 12:05 PM
Old data? UPDATE !
The score is 56/100
SEO Content
Title
Jeroen Janssens
Length : 15
Perfect, your title contains between 10 and 70 characters.
Description
📛 I'm Jeroen (pronounced Yuh-ROON). Welcome to my site. 💻 I work at Posit, PBC as Head of Developer Relations. ✍️ Together with Thijs Nieuwdorp I wrote Python Polars: The Definitive Guide. I’m also the author of Data Science at the Command Line. 🐛 Most of my bugs are written in Python, R, JavaScript and Bash. Every now and then I dabble in C and Lua. I should learn Rust. 🇳🇱 I live in Rotterdam, the Netherlands with my wife and two kids. 🗽 My wife and I have lived in New York City for 2,5...
Length : 495
Ideally, your meta description should contain between 70 and 160 characters (spaces included). Use this free tool to calculate text length.
Keywords
Very bad. We haven't found meta keywords on your page. Use this free online meta tags generator to create keywords.
Og Meta Properties
Good, your page take advantage of Og Properties.
| Property | Content |
|---|---|
| title | Jeroen Janssens |
| type | website |
| description | 📛 I'm Jeroen (pronounced Yuh-ROON). Welcome to my site. 💻 I work at Posit, PBC as Head of Developer Relations. ✍️ Together with Thijs Nieuwdorp I wrote Python Polars: The Definitive Guide. I’m also the author of Data Science at the Command Line. 🐛 Most of my bugs are written in Python, R, JavaScript and Bash. Every now and then I dabble in C and Lua. I should learn Rust. 🇳🇱 I live in Rotterdam, the Netherlands with my wife and two kids. 🗽 My wife and I have lived in New York City for 2,5... |
| site_name | Jeroen Janssens |
| locale | en |
| image | https://jeroenjanssens.com/img/social/an-impressionist-oil-painting-of-a-data-scientist-next-to-a-windmill.png |
| image:type | image/png |
| image:width | 1000 |
| image:height | 1000 |
Headings
| H1 | H2 | H3 | H4 | H5 | H6 |
| 1 | 3 | 0 | 0 | 0 | 0 |
- [H1] 👋 Hoi!
- [H2] Latest articles
- [H2] Selected talks
- [H2] Newsletter
Images
We found 1 images on this web page.
Good, most or all of your images have alt attributes.
Text/HTML Ratio
Ratio : 3%
This page's ratio of text to HTML code is below 15 percent, this means that your website probably needs more text content.
Flash
Perfect, no Flash content has been detected on this page.
Iframe
Too Bad, you have Iframes on the web pages, this mean that content in an Iframe cannot be indexed.
SEO Links
URL Rewrite
Good. Your links looks friendly!
Underscores in the URLs
Perfect! No underscores detected in your URLs.
In-page links
We found a total of 16 links including 0 link(s) to files
| Anchor | Type | Juice |
|---|---|---|
| Jeroen Janssens | Internal | Passing Juice |
| About | Internal | Passing Juice |
| Blog | Internal | Passing Juice |
| Books | Internal | Passing Juice |
| Open Source | Internal | Passing Juice |
| Talks & Publications | Internal | Passing Juice |
| Posit, PBC | External | Passing Juice |
| Python Polars: The Definitive Guide | External | Passing Juice |
| Data Science at the Command Line | Internal | Passing Juice |
| Rotterdam, the Netherlands | External | Passing Juice |
| Lego table | Internal | Passing Juice |
| Plotnine Cheatsheet | Internal | Passing Juice |
| New Role at Posit: Head of Developer Relations | Internal | Passing Juice |
| Goodbye Xomnia | Internal | Passing Juice |
| More articles… | Internal | Passing Juice |
| More talks… | Internal | Passing Juice |
SEO Keywords
Keywords Cloud
blog talks books publications janssens open source jeroen menu
Keywords Consistency
| Keyword | Content | Title | Keywords | Description | Headings |
|---|---|---|---|---|---|
| jeroen | 2 |  |
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| janssens | 2 | |
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| open | 2 | |
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| menu | 1 | |
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| blog | 1 | |
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Usability
Url
Domain : jeroenjanssens.com
Length : 18
Favicon
Great, your website has a favicon.
Printability
We could not find a Print-Friendly CSS.
Language
Good. Your declared language is en.
Dublin Core
This page does not take advantage of Dublin Core.
Document
Doctype
HTML 5
Encoding
Perfect. Your declared charset is UTF-8.
W3C Validity
Errors : 0
Warnings : 0
Email Privacy
Great no email address has been found in plain text!
Deprecated HTML
Great! We haven't found deprecated HTML tags in your HTML.
Speed Tips
|
Excellent, your website doesn't use nested tables. |
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Too bad, your website is using inline styles. |
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Great, your website has few CSS files. |
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Perfect, your website has few JavaScript files. |
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Perfect, your website takes advantage of gzip. |
Mobile
Mobile Optimization
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Apple Icon |
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Meta Viewport Tag |
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Flash content |
Optimization
XML Sitemap
Great, your website has an XML sitemap.
| https://jeroenjanssens.com/sitemap.xml |
Robots.txt
https://jeroenjanssens.com/robots.txt
Great, your website has a robots.txt file.
Analytics
Missing
We didn't detect an analytics tool installed on this website.
Web analytics let you measure visitor activity on your website. You should have at least one analytics tool installed, but It can also be good to install a second in order to cross-check the data.
PageSpeed Insights
Device
Categories
Free SEO Testing Tool
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