Common XML Errors & How to Fix Them
Learn about the most frequent XML mistakes developers make and how to fix them. Use our XML validator below to check your own code.
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XML Error Guides
Click any error for a detailed explanation, code examples, and step-by-step fix instructions.
Unclosed Tag in XML
Learn why XML throws an unclosed tag error and how to fix it. Every opening tag must have a matching closing tag or be self-closing.
Mismatched Tags in XML
XML tag names are case-sensitive. Learn how to fix mismatched opening and closing tags in XML documents.
Unquoted Attribute Values in XML
All XML attribute values must be enclosed in quotes. Learn how to fix unquoted attribute errors.
Unescaped Special Characters in XML
Characters like &, <, and > must be escaped in XML text content. Learn how to fix unescaped character errors.
Multiple Root Elements in XML
XML requires exactly one root element. Learn how to fix the multiple root elements error.
Invalid or Missing XML Declaration
Learn how to write a correct XML declaration and fix common mistakes like wrong attribute order or missing encoding.