#550 · Developer Tool

Open Graph Tag Extractor

Extract Open Graph metadata from HTML into a readable property list and JSON object. The parser handles attributes in any order, decodes HTML entities, retains repeated structured properties such as multiple images, and checks the four core fields commonly needed for link previews. It also reports empty values, duplicate singleton properties, relative og:url or og:image values, and missing image alt text without requesting the live page.

Developer Input

Web metadata input
Ad space

How to use this developer tool

  1. Paste the requested source text or load a local file.
  2. Set any comparison values or processing options shown below the input.
  3. Select the primary action or press Ctrl/Cmd + Enter.
  4. Review the diagnostics, then copy or download the output.

What this developer tool does

The output is formatted JSON where repeated Open Graph properties become arrays rather than being overwritten.

HTML is parsed with DOMParser and meta elements whose property begins with og: are read in document order. Core field diagnostics run on the extracted values.

Extraction cannot reveal metadata injected after load by client-side JavaScript or the final values seen after redirects.

Example

Input

<!doctype html><html><head>
<meta property="og:title" content="API Documentation">
<meta property="og:description" content="Reference guides and examples.">
<meta property="og:url" content="https://example.com/docs/">
<meta property="og:image" content="https://example.com/card.png">
</head></html>

Run the sample to see the exact report and metrics produced by the current implementation.

Use cases

  • Pre-deployment review of generated site files
  • Debugging crawler or link-preview configuration
  • Auditing metadata during a migration
  • Creating repeatable QA evidence for a release

Tips for reliable output

  • Paste the complete source when grouping or document context matters.
  • Use absolute public URLs unless the field explicitly accepts a path.
  • Retest after redirects, route rules, or locale mappings change.
  • Keep a deliberately invalid sample for regression checks.
  • Confirm the deployed result with the relevant external platform.

Processing details

HTML is parsed with DOMParser and meta elements whose property begins with og: are read in document order. Core field diagnostics run on the extracted values. The parser runs entirely in the current browser tab and returns copy-ready text plus structured exports when useful.

Extraction cannot reveal metadata injected after load by client-side JavaScript or the final values seen after redirects.

Frequently asked questions

Can I use this tool without uploading data?

Yes. Processing happens in your browser, and the page makes no request with the supplied input.

What happens when the input is malformed?

The Open Graph Tag Extractor stops, displays an actionable error, and does not produce a misleading successful result.

Does the result guarantee search engine behavior?

No. The result checks the supplied markup or rules; crawlers and social platforms may apply additional policies and cached data.

Can I download the result?

Yes. Use Download for the primary output, or the CSV and JSON buttons when structured exports are available.

How should I test the result before deployment?

Run a representative valid sample and a deliberately invalid case, then verify the deployed public URL with the relevant crawler or platform tool.

Checks and output

AreaBehavior
InputProcessed locally
ErrorsReported without silent correction
ExportCopy, download, and structured data when available

Web Meta & Server Files

Inspect crawler directives, sitemap files, canonical URLs, localized alternates, and social metadata.

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