OpenLink Structured Data Sniffer

OpenLink Structured Data Sniffer

Reveals structured metadata (Microdata, RDFa, JSON-LD, Turtle, etc.) embedded within HTML documents.

OpenLink Structured Data Sniffer promo image
What is OpenLink Structured Data Sniffer?

OpenLink Structured Data Sniffer is a specialized tool designed to enhance your browsing experience by revealing embedded metadata in HTML documents. It exposes structured data islands created using various notations like Microdata, RDFa, JSON-LD, RDF-Turtle, RDF-XML, CSV, and JSON. This tool eases the process of understanding a document's metadata, which can benefit end-users, developers, and digital content managers alike. It visually indicates the presence of metadata and, upon a click, presents transformed metadata in an easy-to-understand format.

Users: 7,468
Rating: 4.76 (17)
Version: 3.0.16 (Last updated: 2023-07-10)
Creation date: 2020-05-30
Risk impact: High risk impact
Risk likelihood: Low risk likelihood
Manifest version: 2
  • storage
  • webRequest
  • webRequestBlocking
  • *://*/*
  • file:///*/*
  • contextMenus
Size: 2.63M
Stats date:

Other platforms

Not available on Firefox
Not available on Edge
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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?

Simply install the extension to your browser and then visit a page of interest. On page arrival, the OSDS icon will be visually activated thereby indicating metadata discovery; once the icon is clicked, you will be presented with a presentation of transformed metadata.

User reviews
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 !)
by Doğa Armangil Doğa Armangil, 2024-02-17

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.
by Joshua Hintze Joshua Hintze, 2023-04-04

Cool, I've been looking for that
by Ron Henry Ron Henry, 2021-11-12
View all user reviews
Risk impact

OpenLink Structured Data Sniffer is risky to use as it requires a number of sensitive permissions that can potentially harm your browser and steal your data. Exercise caution when installing this extension. Review carefully before installing. We recommend that you only install OpenLink Structured Data Sniffer if you trust the publisher.

Risk likelihood

OpenLink Structured Data Sniffer has earned a fairly good reputation and likely can be trusted.

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