Browser-based developer tools

XML Formatter and Validator

Beautify, validate, minify and convert XML with an xmllint-style checker while keeping work inside the browser.

Input

0 bytes

Result

Ready

XML Linter xmllint-style validation notes JSON Formatter Tree view and validation Regex Tester Pattern matching and groups JWT Decoder Inspect token claims Timestamp Converter Unix time and ISO dates

Reference notes

XML cleanup and xmllint-style validation

Integration-friendly output

Formatted XML is easier to review when working with ERP exports, SOAP responses, feeds, configuration files and vendor integration payloads.

Attributes preserved

The XML to JSON view keeps attributes under an explicit attribute object, so converted output remains predictable when XML nodes carry metadata.

Well-formed XML checks

The validator catches common xmllint-style issues such as missing closing tags, mismatched tag names, unescaped characters and multiple root elements.

Frequently asked

XML formatter questions

Can Formalint format XML in the browser?

Yes. The static Formalint XML tool parses and formats XML locally in the browser.

Can XML be converted to JSON?

Formalint can convert a valid XML document into a readable JSON representation while preserving attributes and text content.

Does Formalint upload XML input?

The current static release does not upload XML input to a server.

Why does my XML fail to parse?

The most frequent issues are a missing closing tag, mismatched tag names, an unescaped ampersand or angle bracket inside text content, or more than one root element. XML requires exactly one root element per document.

Does it validate against an XSD schema?

This tool checks that the XML is well-formed per the XML specification. It does not validate against a custom XSD or DTD schema.