OpenLink Structured Data Sniffer

Name: OpenLink Structured Data Sniffer
Rating: 4.56 (18 reviews)
Author: OpenLink Software

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

As of June 2026, OpenLink Structured Data Sniffer has 7,000 users and a 4.56/5 rating from 18 reviews in the Developer Tools category.

OpenLink Software Developer Tools★ Featured

Chrome Web Store ↗.crx

Users0%

7.0K

7,000

Rating0%

4.56

18 reviews

Reviews0%

Version

3.4.27

Manifest V3

History

1 snapshots

Tracking since Apr 21, 2026.

View as table

Date	Users	Rating	Reviews	Version
Apr 21, 2026	7.0K	4.56	18	3.4.27
Now	7.0K	4.56	18	3.4.27

Permissions & access

Permissions: storagewebRequestcontextMenusscriptingdeclarativeNetRequest
Host access: <all_urls>

Screenshots

OpenLink Structured Data Sniffer screenshot 1

OpenLink Structured Data Sniffer screenshot 2

OpenLink Structured Data Sniffer screenshot 3

OpenLink Structured Data Sniffer screenshot 4

About

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.