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The HTTP Header & Redirect Checker for SEO
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OpenLink Structured Data Sniffer
Reveals structured metadata (Microdata, RDFa, JSON-LD, Turtle, etc.) embedded within HTML documents.
Users7KCurrent public install base
Rating4.6Store average score
Reviews18Public review volume
Manifest versionV3Extension platform version
7-day growth0Net users gained this week
7-day growth rate0%Relative weekly velocity
Preview
4 assetsOpenLink Structured Data Sniffer Media preview
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4.56
Latest
4.56
7-day rating change
0.00
2026年7月13日2026年7月19日
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Version3.4.27
ManifestV3
Size2.55MiB
Languages1English
Published
Store updated
Last crawled
English
Overview
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What is it?
The OpenLink Structured Data Sniffer (OSDS) is an extension for Web Extensions compliant browsers (e.g., Google Chrome, Microsoft Edge, Opera, and many others) that discovers Metadata embedded within HTML documents as Structured Data Islands and presents what's discovered using a Property Sheet presentation style.
Currently, OSDS supports discovery and processing of Structured Data Islands published using notations such as Microdata, RDFa, JSON-LD, RDF-Turtle, RDF-XML, CSV, and JSON.
Why is it important?
It simplifies the process of understanding what a given HTML document is about, via its metadata, for both end-users and developers. For instance, it helps Digital Brand Managers, Digital Content Managers, and Semantic Search Engine Optimization (SSEO) practitioners understand what may or may not be affecting Search Engine Results Pages (SERPs) placements.
How is it used?
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Store average score4.6Chrome Web Store aggregate rating, including ratings without synced review text
Synced text average4.1Average computed only from synced review bodies below
Reviews with text9Synced review bodies
Total ratings / reviews18Chrome Web Store public rating/review count
Store average score: 4.6. The bars below are calculated from synced review text only, so they may be empty for extensions that have public ratings but no synced comments yet.
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Load and does nothing then :(
This extension is great at providing insight into the RDF data that is contained in websites. 𝕄𝕚𝕟𝕠𝕣 𝕓𝕦𝕘 𝗧𝗵𝗲 𝗶𝘀𝘀𝘂𝗲: In a turtle file, expanding prefixed node names fails if a prefix URL is missing a "/" after the host part, as in here: "@𝚙𝚛𝚎𝚏𝚒𝚡 𝚜𝚌𝚑𝚎𝚖𝚊: <𝚑𝚝𝚝𝚙𝚜://𝚜𝚌𝚑𝚎𝚖𝚊.𝚘𝚛𝚐>.". So "𝚜𝚌𝚑𝚎𝚖𝚊:𝚌𝚘𝚗𝚝𝚎𝚗𝚝𝚞𝚛𝚕" resolves to "𝚑𝚝𝚝𝚙𝚜://𝚜𝚌𝚑𝚎𝚖𝚊.𝚘𝚛𝚐𝚌𝚘𝚗𝚝𝚎𝚗𝚝𝚞𝚛𝚕/", which is not what we want. 𝗧𝗵𝗲 𝗳𝗶𝘅: Easy, if the path of the prefix URL is empty then act as if the path part were "/". (And: if the RDF-related specs don't mandate this behaviour, then maybe the specs should be fixed as well !)
Unfortunately this plugin adds popup and snackbar items to the DOM. You can see this by inspecting DOM and seeing super_links_popup items and osds_popup junk get added to your DOM in your browser.
Cool, I've been looking for that
Just what I was looking for. Let's me know if my JSON-LD is on the page and I can check it in an easy to read format.
Very helpful tool for seeing structured data on a web page.
Dug around for over an hour trying to find an extension that could display JSON-LD data pulled through an AJAX call. Thought I was going to have to write the thing myself!
I have long been awaiting the arrival of a chrome extension that can effectively detect json-ld and display it in my chrome browser as an alert/extension with the relevant data. This tool detects not only json-ld, but all semantic markup formats/syntaxes (Microdata, rdfa, etc). The UI is elegantly and well thought out in terms of the fact that there are tabs for each syntax. I love this extension and highly recommend it!! As a caveat, it has other interesting features I have not yet fully explored, but that does not detract in any way from my above statements.
Hands down the best-in-class extension for inspecting a page for the presence or absence of structured or semi-structured data.