JSON to XML Converter

Turn JSON into well-formed XML

When an older API, a SOAP endpoint, a payment provider or a configuration system only accepts XML, you need to turn the JSON your application already produces into a valid document. This JSON to XML converter does exactly that. Object keys become element names, nested objects become nested elements, arrays become repeated elements with the same name, and strings, numbers and booleans become text content. Special characters such as < and & are escaped automatically, and null values become empty self-closing elements.

Keys that are not valid XML names are made safe: spaces and symbols are replaced with underscores and names that start with a digit get a leading underscore. The output is indented with two spaces, four spaces or tabs, and an optional <?xml version="1.0" encoding="UTF-8"?> declaration is added at the top.

Attributes, text and the root element

JSON has no attributes, so the converter uses a simple convention: keys that start with the attribute prefix — @ by default — are written as attributes on their parent element, and a #text key sets the element's text content alongside those attributes. This is the same convention the XML to JSON converter produces, so documents survive a round trip. Every XML document needs exactly one root element: if your JSON already has a single top-level key holding an object, that key becomes the root; otherwise everything is wrapped in the root name you set.

Practical tips

Check the receiving system's schema before sending the result: element order, required wrappers and namespaces are often strict in XML, and JSON key order is preserved as written. Add namespace declarations as attributes, for example "@xmlns": "http://example.com/ns". If a list must always appear as a wrapper element with children, model it explicitly as {"items": {"item": [...]}}. All processing happens locally, so payloads containing customer data stay on your machine.