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XML Beautify/Minify

Format, minify, and validate XML documents. Beautify adds indentation; minify collapses whitespace; validation checks well-formedness.

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Overview

The XML Beautify/Minify tool provides:
  • Beautify — Indents tags with 2 spaces using xml-formatter
  • Minify — Removes whitespace between tags
  • Validation — Parses XML with fast-xml-parser to detect errors
Supports XML namespaces, CDATA, processing instructions, and attributes.

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Use Cases

XML cleanup

Format XML from APIs, databases, or legacy systems for readability

File size reduction

Minify XML configuration files or SOAP messages

Validation

Check XML well-formedness before processing or transmission

Debugging

Beautify minified XML from third-party services

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Actions

Uses the xml-formatter library to indent tags with 2 spaces. Preserves CDATA, comments, and attributes.Input:
<root><item id="1"><name>Product</name></item></root>
Output:
<root>
  <item id="1">
    <name>Product</name>
  </item>
</root>

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Validation

The tool validates XML before beautification or minification using fast-xml-parser. If the XML is malformed, an error is returned.
Input:
<root>
  <item>Unclosed tag
</root>
Output:
Unclosed tag at line 2

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Implementation Details

The tool imports fast-xml-parser for validation and xml-formatter for beautification. Source: lib/tools/engine.ts:544-549
Key logic
case 'xml-beautify': {
  const { XMLParser } = await import('fast-xml-parser');
  const parser = new XMLParser();
  parser.parse(input);  // Throws if invalid
  return { output: action === 'minify' ? input.replace(/>\s+</g, '><').trim() : (await import('xml-formatter')).default(input, { indentation: '  ' }) };
}
The minify operation is a simple regex (/>\s+</g) and does not preserve whitespace-sensitive content inside text nodes or CDATA.

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XML Feature Support

<root xmlns:ns="http://example.com">
  <ns:item>Content</ns:item>
</root>
Namespaces are preserved during beautification and minification.
<script><![CDATA[
  function test() { return true; }
]]></script>
CDATA sections are preserved. xml-formatter does not modify CDATA content.
<?xml version="1.0" encoding="UTF-8"?>
<root/>
Processing instructions (e.g., <?xml ... ?>) are preserved.
<!-- This is a comment -->
<root/>
Comments are preserved during beautification and removed during minification.
The tool validates well-formedness only. It does not validate against DTD, XSD, or RelaxNG schemas.

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Keyboard Shortcuts

  • Cmd/Ctrl+Enter — Beautify (default)
  • Cmd/Ctrl+Shift+C — Copy output
  • Cmd/Ctrl+Shift+S — Download output

HTML Beautify/Minify

Format or minify HTML markup

JSON Format/Validate

Validate and format JSON

YAML to JSON

Convert YAML to JSON