Compare: OpenLink Structured Data Sniffer vs JSON-LD Tester

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Metric	OpenLink Structured Data Sniffer	JSON-LD Tester
User count	7,000	7,000
Average rating	4.56	4.88
Rating count	18	16
Last updated	2025-08-18	2024-07-23
Size	2.55 MB	0.39 MB
Version	3.4.27	1.0.14

Short description	Discover and visualize structured metadata (Microdata, RDFa, JSON-LD) embedded in web pages with OpenLink Structured Data Sniffer browser extension.	Easily validate and view JSON-LD structured data on any webpage with multi-language and dark mode support.
Full summary	OpenLink Structured Data Sniffer (OSDS) is a powerful browser extension compatible with Chrome, Edge, Opera, and other Web Extensions browsers. It detects and displays structured metadata embedded within HTML documents, such as Microdata, RDFa, JSON-LD, Turtle, CSV, and JSON, presenting it clearly in a Property Sheet format. This extension is essential for Digital Brand Managers, Content Managers, and Semantic SEO professionals looking to better understand how metadata affects search engine results. Simply install OSDS, visit any web page, and the extension icon activates once metadata is detected, allowing instant access to detailed structured data insights.	The JSON-LD Tester Chrome extension provides a robust tool to validate and display JSON-LD structured data directly from the current tab. Featuring multi-language support including Chinese, English, German, and Spanish, and a user-friendly dark mode, it simplifies the process of checking JSON-LD snippets for accuracy and compliance. Users can validate single or multiple snippets, view canonical and robots meta tags, and refresh data on demand without reloading the page. Regular updates have improved the interface and functionality by fixing bugs, integrating Google's Rich-Test validation, and optimizing permissions for a streamlined and secure experience. This extension is ideal for web developers and SEO professionals looking for a convenient way to test and debug structured data on websites.