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XML Validator Online - Check XML Syntax

Free online XML validator. Check XML syntax, well-formedness, and get error details with line numbers.

XML Validator

Validate XML syntax

Features

  • XML syntax validation
  • Well-formedness checking
  • Unmatched tag detection
  • Duplicate attribute detection
  • Detailed error messages with line information
  • Pretty-print with automatic indentation
  • No external dependencies required
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How to Use XML Validator

  1. Paste your data into the XML Validator input area
  2. Click Validate to check your data against the rules
  3. Review any errors or warnings shown in the results
  4. Fix issues based on the detailed error messages provided

Common Use Cases

  • Converting JSON data to XML for legacy system integration
  • Transforming API responses between JSON and XML formats
  • Generating XML from JSON for SOAP web services
  • Validating XML syntax and structure

Frequently Asked Questions

Is XML Validator free to use?
Yes, XML Validator is completely free with no signup required. You can use it as many times as you need.
Is my data safe when using XML Validator?
Absolutely. All processing happens directly in your browser. Your data is never sent to any server or stored anywhere.
What validation rules are checked?
XML Validator checks against the official specification and reports syntax errors, structural issues, and common mistakes.
Can I validate large documents?
Yes, validation happens in your browser and can handle documents of any reasonable size efficiently.
Does it show where errors are located?
Yes, XML Validator highlights the exact location of errors and provides descriptive messages to help you fix them.

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