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XML Validator

Validate XML online with DTD and XSD schema checks plus formatting tools

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Features Overview

Powerful XML validation and conversion tool supporting basic syntax checking, XSD Schema validation, and XML to JSON conversion. All processing runs in your browser to protect your data privacy.

Tool Description

Free XML validator online. Validate XML syntax, check XML against DTD or XSD schema rules, format documents, and convert XML to JSON for debugging API responses, feeds, and config files. Everything runs locally in your browser for private validation.

Capabilities Checklist

  • Basic XML syntax validation - Quickly check if XML format is correct
  • XSD Schema validation - Validate XML against specified structure specifications
  • XML formatting and beautification - Auto-indent to improve readability
  • XML to JSON conversion - Convert XML data to JSON format with one click
  • Detailed error messages - Precisely locate error line and column positions
  • File upload support - Directly upload XML and XSD files
  • Sample data - Built-in examples to help you get started quickly
  • Data privacy protection - All processing completed locally in browser

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Frequently Asked Questions

What is XML validation?
XML validation is the process of checking whether an XML document conforms to syntax rules and structural specifications. Basic validation checks if tags are properly closed, attributes are legal, etc.; XSD validation further checks if XML conforms to predefined data structures and type constraints.
What's the difference between XSD Schema validation and basic validation?
Basic validation only checks if XML syntax is correct (such as tag closure, attribute format, etc.), while XSD Schema validation checks XML structure, element order, data types, etc. against the XSD file you provide, making it a more strict validation method.
Is my data safe?
Absolutely safe! All validation, formatting, and conversion operations of this tool are completed locally in your browser, without uploading any data to the server, ensuring your XML content remains completely private.
What XML formats are supported?
This tool supports standard XML 1.0 format, including XML with namespaces, XML containing CDATA, and other common formats. XSD validation supports the W3C XML Schema standard.
How are attributes handled when converting XML to JSON?
XML attributes are converted to JSON object properties with an '@_' prefix (e.g., <book id='1'> becomes {"book": {"@_id": "1"}}). Element text content is stored in the '#text' field.