Does this XML formatter send my documents to a server?

No. Parsing, formatting, minification, validation, and conversion run entirely in your browser with the built-in DOMParser and XMLSerializer APIs. Your XML and JSON stay on your device unless you copy or share them elsewhere.

How does XML → JSON represent attributes and text?

Element text content is stored under the _text key when present. Attributes are grouped in an object under _attr. Repeated child elements with the same tag name become a JSON array. Empty elements become an empty object {}. This keeps round-trips predictable when you convert back with JSON → XML.

Why does JSON → XML say the root must have one property?

Well-formed XML has a single document element. This tool expects your JSON to mirror the XML → JSON shape: one top-level key whose name becomes the root tag. If you have multiple top-level keys, wrap them in a single parent object first.

Why does validation or formatting fail with a parser error?

The browser’s XML parser requires well-formed markup: every tag must be closed or self-closing, special characters must be escaped, and attribute values must be quoted. A stray unescaped < inside text, a mismatched end tag, or invalid characters can trigger parsererror. Fix the reported line or message in your source and try again.

Is this a full XML Schema or XPath tool?

No. This page checks well-formedness and transforms structure between XML and JSON. It does not validate against XSD, perform XPath queries, or resolve external entities. Use dedicated schema validators or editors when you need those features.

Free XML Formatter, Validator & JSON Converter Online

XML Formatter & Converter

Input capped at 500,000 characters

Input (XML or JSON for “JSON → XML”)0 chars

Output

0 chars

JSON → XML expects an object with exactly one root key (matching this tool’s XML → JSON output). Text nodes use _text; attributes use _attr. Processing runs entirely in your browser.

Related Tools

JSON Editor

Edit, format, and repair JSON alongside XML workflows when you move between structured text formats.

CSV Editor

View and transform tabular data when exporting from spreadsheets or APIs into markup or JSON pipelines.

HTML Editor & Preview

Work with markup-heavy content and previews when your XML-like documents feed HTML or documentation.

What is XML formatting?

XML formatting (pretty-printing) adds consistent indentation and line breaks so nested elements, attributes, and text are easy to scan. It does not change the data model of the document—only how it is laid out. Minification does the opposite: it removes non-essential whitespace between tags to shrink payloads for storage or transport.

This tool uses your browser’s native parser, so you get fast feedback without installing desktop software or uploading files to a server.

How to use this tool

Paste XML into Input, or load the sample with Sample XML.
Click Format for 2-space indented output, or Minify for a compact single-line-style document.
Use XML → JSON to inspect structure as JSON; use JSON → XML when your input is JSON with a single root property matching this tool’s output shape.
Click Validate to confirm the input is well-formed; errors appear inline under the actions.
Copy results from the Output pane with Copy.

XML and JSON conversion model

Conversion here is structural and opinionated: element names become object keys, text nodes map to _text, and attributes map to _attr. Repeated siblings share a key and become a JSON array on the way out, and arrays round-trip back into repeated elements on the way in.

Namespaces, processing instructions beyond the usual declaration, and mixed content with complex whitespace may need manual cleanup after conversion. Treat this as a developer utility for quick transforms, not a full data-binding or schema-validation pipeline.

Privacy and limits

All work happens locally in the tab. Input length is capped to keep the UI responsive on very large documents. If you hit the limit, trim the file or process it in chunks.

For untrusted XML, avoid enabling features elsewhere that resolve external entities; this page does not fetch external DTDs, but good hygiene still applies when you paste data from unknown sources.

Frequently asked questions about XML tools

What is XML formatting?

This tool uses your browser’s native parser, so you get fast feedback without installing desktop software or uploading files to a server.

How to use this tool

Paste XML into Input, or load the sample with Sample XML.

Click Format for 2-space indented output, or Minify for a compact single-line-style document.

Use XML → JSON to inspect structure as JSON; use JSON → XML when your input is JSON with a single root property matching this tool’s output shape.

Click Validate to confirm the input is well-formed; errors appear inline under the actions.

Copy results from the Output pane with Copy.

XML and JSON conversion model

Privacy and limits

All work happens locally in the tab. Input length is capped to keep the UI responsive on very large documents. If you hit the limit, trim the file or process it in chunks.

For untrusted XML, avoid enabling features elsewhere that resolve external entities; this page does not fetch external DTDs, but good hygiene still applies when you paste data from unknown sources.