OpenLink Structured Data Sniffer icon

OpenLink Structured Data Sniffer

by OpenLink Software · Developer Tools
FeaturedManifest V3 Free
View in Chrome Web Store Data as of 15 Oct 2026

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

Users
7,000
0 in 30 days
Rating
4.6 / 5
unchanged in 30 days
Ratings
18
0 in 30 days
Store rank
#12K
#10K among extensions
Version
3.4.27
updated 18 Aug 2025

Users

monthly, 3 years
2,0004,5007,000Aug 2023Apr 2025Oct 2026
Latest, 15 Oct 2026: 7,000 usersMove the mouse over the chart for any month

Ratings count

monthly, 3 years
51218Aug 2023Apr 2025Oct 2026
Latest, 15 Oct 2026: 18 ratingsMove the mouse over the chart for any month

The Chrome Web Store rounds user counts down to the leading digit, so the user line moves in steps. The ratings count is exact and is the better signal of real adoption.

About OpenLink Structured Data Sniffer

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.

Growth

WindowUsersChangeRatingsRating
7 days0+0.0%00.00
30 days0+0.0%00.00
6 months0+0.0%00.00
1 year0+0.0%00.00

Chrome Web Store search rankings

Where OpenLink Structured Data Sniffer appears when people search the store, with the 30 day change
Search phrasePosition30 days
data#11+10
software#100new

Version history

25 versions recorded
3.4.2718 Aug 2025
3.4.813 Nov 2024
3.3.1024 Jun 2024
3.2.2928 Apr 2024
3.2.2722 Apr 2024
3.0.169 Jul 2023
3.0.02 May 2023
2.22.1013 Jan 2023

Details

Category
Developer Tools
First seen
30 May 2020
Size
2.6 MB
Languages
en
Pricing
Free
Privacy policy
openlinksw.com
Support
shop.openlinksw.com
Extension ID
egdaiaihbdoiibopledjahjaihbmjhdj

Permissions and risk

Minimal riskimpact 3, likelihood 0
Permissions
storagewebRequestcontextMenusscriptingdeclarativeNetRequest
Site access
<all_urls>
Can read and change data on every website you visit.

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