XML Formatter - Beautify, Minify, Validate & Convert to JSON
Pretty Print / Minify / Validate (with error location) / XML↔JSON
About XML Formatting
This tool is built on the fast-xml-parser library and provides XML pretty-printing, minification, well-formedness validation (with the exact line and column of each error), and bidirectional XML ↔ JSON conversion. It fully supports attributes, namespaces, self-closing tags, and CDATA sections. Everything runs locally in your browser—your data is never uploaded to a server.
Feature Details
XML Pretty-Print
Rebuilds minified or messy XML with a chosen indentation (2 or 4 spaces) so the tag hierarchy becomes clean and readable. Ideal for reviewing SOAP/WebService responses, SVG files, and configuration files.
XML Minify
Removes all whitespace—line breaks, indentation, and extra spaces—to collapse XML into a single line, reducing file size by 20%–40% for faster network transfer and storage.
XML Validation
Checks whether XML is well-formed. On a syntax error such as an unclosed tag, an unquoted attribute value, or an illegal character, the tool returns the specific message together with the line and column so you can fix it quickly.
XML ↔ JSON Conversion
Converts bidirectionally between XML and JSON. After turning XML into JSON you can inspect it further with the JSON Validator; converting JSON to XML is handy for generating API request payloads.
Frequently Asked Questions
Why did the attribute order change after formatting?
The XML standard does not prescribe any order between attributes. During formatting, attributes may be re-sorted alphabetically; this does not affect XML semantics or data integrity.
Did I lose data types when converting XML to JSON?
XML itself does not distinguish numbers from strings, so every value is treated as a string during conversion. If you need to preserve type information, review the result with the <a href="/en/json-formatter" class="text-link">JSON Formatter</a> and cast the types in your code.
What common errors cause XML validation to fail?
The most common ones are an unclosed tag (such as <code><name>value</code> missing <code></name></code>), an unquoted attribute value (such as <code>id=1</code> instead of <code>id="1"</code>), and unescaped special characters (<code>&</code>, <code><</code>, <code>></code> must be written as entity references).
Does it support DTD or XSD validation?
This tool provides well-formedness validation and XML formatting, which covers day-to-day XML structure checking needs.