ZenovayTools

XML Validator

Validate XML syntax and format it with pretty-printing. Uses DOMParser for accurate validation with line-by-line error reporting.

XML Input

How to Use XML Validator

  1. 1Paste your XML content.
  2. 2See validation status instantly.
  3. 3View formatted XML with element counts.
  4. 4Copy the formatted output.
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Frequently Asked Questions

What is XML?▾
XML (Extensible Markup Language) is a text-based format for storing and transporting structured data. Unlike HTML, XML tags are not predefined — you define your own. XML is used for configuration files (Maven pom.xml, Android layouts), data exchange (SOAP web services, RSS/Atom feeds), office formats (DOCX, XLSX are ZIP archives containing XML), SVG vector graphics, and XHTML. XML is strictly case-sensitive and requires proper nesting and closing tags for every element.
What is the difference between well-formed and valid XML?▾
Well-formed XML must satisfy structural rules: exactly one root element, all tags properly nested, every element closed, all attribute values quoted, and special characters escaped (< > & " '). Valid XML additionally conforms to a schema — a DTD or XSD — that defines the allowed elements, attributes, and data types. A document can be well-formed without being valid. This tool checks that your XML is well-formed by parsing it with the browser's native DOMParser.
What are the most common XML errors?▾
The most frequent XML mistakes are: (1) Unclosed tags — every opening tag must have a matching closing tag or use self-closing syntax (<br/>). (2) Unescaped special characters — < and & in text content must be written as &lt; and &amp;. (3) Missing root element — XML must have exactly one top-level element. (4) Case mismatch — <Book> and </book> do not match. (5) Unquoted attribute values — attributes must be quoted: id="1" not id=1. (6) Crossing/overlapping tags — <a><b></a></b> is illegal; tags must be properly nested.
How does XML compare to JSON?▾
XML is more verbose but more expressive: it supports attributes, mixed content (text and child elements together), comments, namespaces, and can be validated against strict schemas. JSON is simpler, more compact, and easier for JavaScript to consume, making it the dominant format for REST APIs. XML is still preferred in enterprise environments (SOAP, EDI, XBRL), office document formats, and whenever namespaces or schema validation are required. XML can represent document-oriented data (text with inline markup); JSON cannot.
What are XML namespaces and when are they used?▾
XML namespaces prevent element name conflicts when combining XML vocabularies. A namespace is declared with xmlns:prefix="URI" on any element, and the URI is an identifier (not a URL to fetch). For example, a SOAP envelope uses xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" so <soap:Body> is distinct from any other <Body>. The default namespace (xmlns="URI") applies to unprefixed elements. Namespaces are common in SOAP, XHTML, SVG, and any XML mixing multiple schemas or standards.