XML Formatter

How it works

The formatter checks that every opening tag has a matching closing tag, in the right order, then re-prints the document with one tag per line, indented by nesting depth. A mismatched or unclosed tag is reported with the specific tag name involved, instead of a generic parse error.

Scope is deliberately limited to what most hand-written or API-response XML actually uses: elements, attributes, text content, and self-closing tags. An XML declaration, DOCTYPE, or comment is passed through on its own line rather than fully parsed, and CDATA sections and namespaces are not given special handling — this is a formatter for everyday XML, not a full spec-compliant parser.