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XML Formatter Online — Format, Validate, Minify + XML ↔ JSON Converter

Pretty-print XML, validate well-formedness, minify to one line, convert XML ↔ JSON. Supports namespaces, attributes, CDATA. For SOAP API integrations, RSS feed parsing, legacy XML configs. 100% client-side.

FormatValidateMinifyXML↔JSON

Why use this tool

🔄
Bidirectional XML ↔ JSON

Convert between two common formats: XML from SOAP APIs / legacy configs → modern JSON; or JSON → XML for legacy system integration.

✓
Strict XML 1.0 validation

Checks well-formedness: unclosed tags, mismatched, invalid attributes, prohibited chars. Reports the error line.

🔒
Privacy-first

XML configs / API responses may contain sensitive data. Tool runs 100% client-side — XML content is not uploaded.

How to use

  1. 1Pick action: Format / Minify / Validate / XML→JSON / JSON→XML.
  2. 2Paste XML (or JSON if you picked JSON→XML).
  3. 3Click Run.
  4. 4Green badge = OK, red = error with details. 1-click copy of the output.

XML — Still relevant in 2026

XML may not be as 'sexy' as JSON but it's heavily used in enterprise / legacy stacks: SOAP web services (banking, government), Office Open XML (DOCX/XLSX/PPTX), SVG, RSS/Atom feeds, Maven/Gradle dependencies, Android layout XML, Spring config, MyBatis mappers, sitemap.xml. Modern devs still parse / generate XML regularly.

This tool uses fast-xml-parser — the fastest XML parser for Node/Browser (5M+ weekly downloads), supports attributes, namespaces, CDATA, processing instructions, boolean attributes, mixed content. Converts XML ↔ JSON using @_ prefix to distinguish attributes from elements in the JSON output.

When to use this over other online tools (xmlformatter.org, freeformatter.com)? Privacy — XML configs / API responses may leak internal schemas / endpoints. Speed — pure client-side, no API calls. Integration — combine with the JSON / YAML / CSV tools in DevTools in the same workflow.

  • ✓XML 1.0 well-formed validation
  • ✓Pretty 2-space indent
  • ✓Minify to one line
  • ✓XML → JSON
  • ✓JSON → XML
  • ✓Namespace + attribute + CDATA support
  • ✓Error report with line
  • ✓100% client-side

FAQ

XSD / DTD validation supported?

Not yet. Phase 1 is well-formed only. Schema validation (XSD / DTD / RelaxNG) needs a heavier lib — deferred to Phase 2.

Are XML namespaces preserved in JSON?

Yes. Namespace prefixes stay in element names. Attribute namespaces appear with @_ prefix in the JSON keys.

Can I format SVG?

Yes. SVG is XML. Format SVG to inspect / minify viewBox path data.

What about XML signature / encryption (XMLDSig / XMLEnc)?

The tool only formats / validates structure. Decrypt / signature verify needs separate crypto setup — not supported.