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JSON Formatter & Validator
Format and validate JSON syntax — the sibling tool for JSON APIs, config files, and log payloads.
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XML Formatter & Validator
Paste any XML to instantly format it with readable indentation or minify it to one line. Parse errors show the exact line and what went wrong. 100% in-browser — nothing leaves your device.
All formatting runs in your browser using the native
DOMParser API. Your data is never uploaded or stored.
About XML Formatter & Validator
XML Formatter & Validator beautifies messy or minified XML by re-indenting it with consistent two-space levels. Paste a SOAP envelope, a Maven POM, a Spring configuration, or a raw Atom feed — the tool parses it with the browser's native DOMParser, rebuilds the element tree with proper indentation, and shows parse errors with the exact line and column if the document is malformed. Minify mode strips all whitespace between tags into a single line, useful when you need the smallest payload for a request header or diff. Nothing is uploaded; all processing runs in your browser.
Common use cases
- Debugging XML APIs — Pretty-print SOAP or REST XML responses from DevTools or curl output to spot schema violations or unexpected nesting.
- Config file review — Format Spring, Maven, or Ant XML configs before committing to catch unclosed tags and missing namespace declarations.
- Feed inspection — Beautify Atom or RSS payloads to verify structure, entry counts, and link hrefs without installing an RSS reader.
- Minifying for transport — Strip inter-element whitespace before embedding XML in a request body or comparing against a stored snapshot.
Frequently asked questions
Does this tool validate XML against a schema (XSD)?
No — it checks that the XML is well-formed (correct tag nesting, valid attribute syntax, single root element) using the browser's native DOMParser. XSD schema validation is out of scope for this tool.
Why does my output have extra namespace declarations?
The DOMParser makes implicit namespaces explicit when rebuilding the tree. The namespace declarations were always present in your document — they're now visible in the output. The XML is correct and equivalent to the original.
My XML starts with <?xml version="1.0"?> — why doesn't the output include it?
The XML declaration is part of the document prolog, not the element tree. The DOMParser doesn't surface it in the DOM, so the serializer can't include it. The output starts with the root element — the content is fully preserved.
Is there a file size limit?
No hard limit — all processing runs in your browser. Very large documents (over 5 MB) may take a moment, but there's no server-side cap.
Can I use this for HTML documents?
HTML is not XML. The tool uses the strict XML parser, which requires well-formedness — unclosed tags and bare & or < characters that browsers silently accept in HTML will cause parse errors here. Use a dedicated HTML formatter for HTML files.
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