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XML Validator
Validate whether XML syntax is correct.
Overview
- Checks whether the XML you enter is syntactically correct.
- Unlike XML Formatter, the result is not formatted XML but a validity verdict and, when invalid, the error details.
- Uses the browser's standard XML parser, so it validates against the same criteria that browsers and libraries actually use to detect errors, such as missing closing tags or mismatched tag names.
Usage
- Enter the XML you want to validate into the text area.
- Click the "Validate" button.
- If the syntax is correct, "This is valid XML." is displayed; otherwise, the error details are shown.
Example
Input
<root><name>Taro</name></root>
Output
This is valid XML.
Use Cases
- Checking that manually edited XML, or XML received from another system, is not broken before processing it
- Validating a configuration file (pom.xml, web.xml, etc.) before saving it
- Checking that XML automatically generated by a template engine or script is syntactically correct
FAQ
Is the XML I enter sent anywhere?
No. All validation happens entirely in your browser and is never sent to an external server.
Is the cause of an error shown?
Yes. The error details returned by the browser's XML parser (such as a missing closing tag) are shown whenever possible.
Can validation modify the input content?
No. This tool only validates the input and never modifies it.
Notes
- The result only judges whether the XML is well-formed. It does not check conformance to a DTD or XML Schema.
- XML must have exactly one root element. Having multiple root elements results in an error.
- Validating very large XML data may make browser processing slow.
Related Tools
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Validate whether JSON is correctly formatted.