XML Tools Online – Format, Validate & Convert XML

XML developer tool guide

Format, validate, and convert XML locally

Use the XML workspace above to format XML documents, check whether markup is well-formed, convert XML to readable JSON, or create XML from JSON. Parsing and conversion use browser APIs, so API payloads, feeds, configuration files, and document fragments stay on your device. This tool is free to use. No account or payment is required.

Last updated August 10, 2026

What you can do here

XML formatting
XML well-formedness validation
XML to JSON conversion
JSON to XML conversion
.xml file import
Browser-local processing

Steps

Paste XML or import a .xml text file.
Choose Format, Validate, XML → JSON, or JSON → XML from the toolbar.
Review parser errors or the converted output before using the result.
Copy the result or download it with a mode-specific extension.

Work with XML without uploading the document

XML often appears in API responses, RSS or Atom feeds, SOAP messages, configuration, exported data, and document formats. VetaTool parses the text in the browser instead of posting it to a conversion endpoint.

The workspace accepts pasted XML and local .xml files. Large inputs use the same manual processing guard as the other toolbox editors so a long document is not reparsed after every keystroke.

Format and validate well-formed XML

Validation uses the browser XML parser and reports malformed markup such as mismatched tags or an incomplete document. Formatting only runs after parsing succeeds, then adds readable indentation while keeping mixed-content elements compact so significant text is not split by formatting whitespace.

A valid result means the XML is well-formed. It does not validate an XSD, DTD business rule, or an application-specific schema.

Beautify compact XML before code review or debugging.
Check well-formedness before investigating an application error.
Keep private payloads and configuration in the browser.

Convert XML and JSON with explicit mapping rules

XML → JSON keeps element names as object keys, stores attributes under @attributes, stores significant text under #text when an element also has attributes or children, and turns repeated sibling elements into arrays.

JSON → XML uses a single top-level object key as the document root when possible. Arrays become repeated elements, while @attributes and #text can recreate the mapping produced by the XML-to-JSON direction.

XML formatting example

Compact nested XML becomes easier to scan while element names, attributes, and text values stay intact.

XML input

<feed version="1"><title>Updates</title><entry><id>42</id></entry></feed>

Formatted XML

<feed version="1">
  <title>Updates</title>
  <entry>
    <id>42</id>
  </entry>
</feed>

Common questions

Frequently asked questions

Does the XML tool upload my document?

No. XML parsing, formatting, validation, and JSON conversion run locally in your browser.

Does XML validation check an XSD schema?

No. The current validator checks whether the XML document is well-formed. It does not validate XSD constraints or application-specific rules.

How are XML attributes represented in JSON?

Attributes are grouped under an @attributes object. Significant text is stored under #text when the same element also carries attributes or child elements.

Can I convert JSON back to XML?

Yes. Use JSON → XML. A single top-level object key becomes the root element, arrays become repeated elements, and invalid XML names are reported instead of silently rewritten.

Looking for broader references? Browse all developer guides.

Debugging a specific XML issue? Browse XML troubleshooting.