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Check your XML syntax instantly. Get clear error messages showing the exact location of every XML syntax error — all running locally in your browser.
XML validation checks that a document conforms to the XML 1.0 specification: all tags must be properly opened and closed, attribute values must be quoted, special characters must be escaped as entities, and the document must have a single root element. Even a single misplaced angle bracket can make an entire XML document unparseable.
JSON Viewer Pro's XML validator uses the browser's native DOMParser to check your XML in real time. When an error is detected, you see the exact line and column number along with a description of the problem. The Monaco editor places a red error marker directly on the offending line so you can find and fix the issue without counting characters manually.
Common XML errors include unclosed tags, missing closing angle brackets, unescaped & characters (use &), unescaped < characters outside of CDATA sections, duplicate attribute names, and invalid XML characters. The validator catches all of these and gives you a clear explanation of what went wrong and where.
Unclosed tags, unescaped special characters (&, <, >), missing quotes around attribute values, duplicate attributes, or multiple root elements.
Not currently. The validator checks well-formedness (XML syntax). XSD schema validation is on the roadmap.
Yes. Validation runs in real time with a short debounce, so the editor stays responsive even on large XML files.
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