TULKIT

XML Validator - Check XML Syntax Online

Validate your XML documents instantly with our free online XML Validator. Check for well-formedness, syntax errors, and proper nesting to ensure your XML data is ready for processing.

Why Validate Your XML?

  • Prevent Parsing Errors: Ensure XML parsers can read your data
  • Data Integrity: Verify structure before processing or storage
  • Interoperability: Ensure XML works across different systems
  • Error Localization: Pinpoint exactly where issues occur

Common Use Cases

🔗 SOAP Web Services

Validate SOAP XML messages and payloads.

📄 RSS/Atom Feeds

Check XML feed validity before publishing.

🗄️ Data Exchange

Validate XML from external data sources.

⚙️ Config Files

Check XML configuration files (web.config, pom.xml).

How to Use This Tool

  1. Paste Your XML: Enter the XML document you want to validate.
  2. Click "Validate XML": Our parser checks your XML for errors.
  3. Review Results: Fix any issues shown and re-validate.

💡 Tip: This tool checks for well-formedness. For schema validation (XSD), you'll need additional tools.

XML Validator Tool

Results will appear here after validation...

XML Well-Formedness Rules

Valid XML must follow these rules:

  • Single Root Element: Only one root element allowed
  • Proper Nesting: Tags must be opened and closed in correct order
  • Case Sensitive: <Tag> and <tag> are different elements
  • Quoted Attributes: Attribute values must be in quotes
  • Escaped Characters: <, >, & must be escaped in content
  • Prolog Optional: <?xml?> declaration is optional but recommended

Common XML Errors

  • <tag></Tag> - Case mismatch in opening/closing tags
  • <a><b></a></b> - Improper nesting
  • <elem attr=value> - Unquoted attribute value
  • <text>5 < 10</text> - Unescaped less-than sign

XML vs HTML

Unlike HTML, XML is strict about syntax. HTML browsers are forgiving with errors, but XML parsers will fail on any syntax violation. This strictness ensures data integrity but requires more careful authoring.

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