XML Formatter & Validator
Format, minify, validate, beautify, and convert XML documents online. Supports SOAP, RSS, SVG, pom.xml, line/column diagnostics, 100% client-side.
| Feature | XML | JSON | YAML |
|---|---|---|---|
| Attributes Support | Yes (`id="1"`) | No native equivalent | No native equivalent |
| Comments Support | Yes (<!-- -->) | No | Yes (`#`) |
| Namespaces (`xmlns`) | Yes (`xmlns:h="..."`) | No | No |
| CDATA Blocks | Yes (<![CDATA[...]]>) | No | No |
| Human Readable | Yes | Yes | Yes |
| Primary Use Cases | SOAP, RSS, SVG, pom.xml | REST APIs, config | Kubernetes, Docker |
Attributes add metadata inside element opening tags. In JSON representations, attributes are mapped using the @_name prefix.
CDATA blocks embed raw text strings containing special markup characters like <, >, or & without XML escaping.
What Is XML?
XML (Extensible Markup Language) structures data using nested, named tags — still widely used for SOAP web services, RSS/Atom feeds, SVG images, and configuration files like Maven's pom.xml.
How to Use the XML Formatter & Validator
- Paste XML to format (pretty-print), minify, or validate it.
- Validation checks that the document is well-formed and reports the exact location of any syntax error.
- Convert to or from JSON when you need to work with the data in a different format.
- Minifying removes unnecessary whitespace to reduce size for transmission or storage.
Technical Notes
- "Well-formed" means every tag is properly opened, closed, and nested — it does not mean the document matches a particular schema (like a specific SOAP or RSS structure), which is a separate, stricter kind of validation this tool does not perform.
- Special characters like <, >, and & must be escaped (as <, >, &) inside XML text content — the formatter preserves correct escaping rather than introducing or removing it.
Frequently Asked Questions
How are XML Attributes represented in JSON?+
XML attributes are converted to JSON properties prefixed with "@_". For example, <note date="2026-08-30"> maps to { "note": { "@_date": "2026-08-30" } }.
Are external XML entities (XXE) safe?+
Yes. External DTD entity resolution is strictly disabled by default in our engine to eliminate XXE vulnerability risks completely.