XML Validator
Validate XML syntax, inspect document structure, and format well-formed XML.
XML Validator
Check whether XML is well formed before converting, importing, or sending it to another system. Validation runs locally in the browser.
What this XML checker reports
- Parser errors for broken tags, invalid nesting, and malformed XML
- Root element, element count, attribute count, and common node names
- Formatted XML output for valid documents
How to use XML Validator
The XML validator checks whether XML is well formed and can format the structure for reading. It is useful for feeds, config files, and API payloads.
Developers often use this page when they need xml validator, xml checker, xml linter, and xml tester.
Privacy and data handling
This tool is designed to run in your browser for normal use, so your input does not need to be sent to a server.
- Input and output stay on the page while you work.
- Copy buttons use your browser clipboard permission when available.
- Avoid pasting private production data on shared or untrusted devices.
Examples
Find a mismatched XML tag
Input
<user><name>Ada</user>Output
Error: expected closing tag for nameXML is strict. Tags must close in the correct order.
Steps
- 1Paste XML into the input box.
- 2Validate it and read any parser error.
- 3Format the XML if you need a cleaner view.
Common use cases
- Check an XML API response.
- Validate a feed snippet.
- Find mismatched tags in a config file.
Practical tips
- XML requires one root element.
- Tags must be closed in the correct order.
- Special characters may need escaping.
FAQ
What does well-formed XML mean?
It means the XML follows basic syntax rules, such as one root element, proper closing tags, and valid nesting.
Does this validate against an XSD schema?
It is mainly for syntax and structure checks. Schema validation depends on XSD support and rules.