#270 · Developer Tool

XML Namespace Extractor

Extract namespace declarations and prefix usage from an XML document without sending the document anywhere. The inventory records default and named xmlns declarations, their element locations, and each namespace URI. It also counts prefixes used by element and attribute names, then flags used prefixes that have no visible declaration. XML parser errors are surfaced before the report is built, which makes the result useful for namespace cleanup and integration debugging.

Developer Input

XML document
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How to use this developer tool

  1. Paste or upload the xml document you want to inspect.
  2. Run Extract Namespaces, or press Ctrl/Cmd + Enter.
  3. Read the summary, diagnostics, and reported counts before using the output.
  4. Copy the result or download it in the shown format.

What this developer tool does

The browser XML parser validates well-formedness. A tree walk then records xmlns attributes and qualified element or attribute names throughout the document.

Default declarations are labeled (default), while prefixed declarations retain their exact prefix. Reserved xml usage is recognized without requiring an explicit declaration.

Namespace scope can change on nested elements. The declaration list includes the element path so local overrides are visible instead of collapsed.

Example

The Sample button loads a representative xml document. Running it produces the same kind of namespace inventory shown in the result panel, including counts that are calculated from the supplied text rather than fixed examples.

<?xml version="1.0"?>
<catalog xmlns="https://example.com/catalog" xmlns:xlink="http://www.w3.org/1999/xlink">
  <item xlink:href="/items/1">First</item>
  <meta xmlns:dc="http://purl.org/dc/elements/1.1/" dc:title="Demo"/>
</catalog>

Use cases

  • Review configuration changes before committing them.
  • Diagnose format-specific problems in CI or deployment inputs.
  • Create a copy-ready result for documentation or another developer tool.
  • Check generated files without exposing project data to a remote service.

Tips for reliable output

  • Start with the smallest input that reproduces a problem.
  • Keep a copy of the original before replacing configuration files.
  • Read warnings and limitations, even when the main result succeeds.
  • Validate the output again with the parser used by your application.
  • Use UTF-8 when saving downloaded text.

Processing details

URI counts are deduplicated, but every declaration stays in the detailed output. Prefix use counts cover both element names and non-xmlns attributes.

DTD validation, external entities, XML Schema validation, and namespace URI dereferencing are not performed. The tool only analyzes the supplied XML text.

Frequently asked questions

Does XML Namespace Extractor upload my input?

No. Processing runs in your browser, and the page does not send the supplied text to an API.

What input should I use with XML Namespace Extractor?

Use one well-formed XML document.

Will the output cover every edge of the format?

DTD validation, external entities, XML Schema validation, and namespace URI dereferencing are not performed. The tool only analyzes the supplied XML text.

What happens when the input is invalid?

The run stops and the error area identifies the first problem the tool can locate. No partial result is presented as complete.

Can I save the result?

Yes. Copy the output, download the primary result, or use the structured JSON or CSV download when those buttons appear.

Tool details

CategoryData & Format Tools
InputXML document
Primary outputNamespace inventory
Runs locallyYes
Data & Format ToolsBrowse JSON, YAML, TOML, XML, and structured-data utilities.Open category →