JSON to XML Converter

How to use the JSON to XML converter

1. Choose the direction: JSON → XML or XML → JSON.
2. Paste your data, or click Open a file to load a .json or .xml file (up to 10 MB).
3. Set the options: Indentation (2 spaces, 4 spaces, tab or None (compact)) for both directions; Root element and Add the XML declaration for JSON → XML; Convert numbers and booleans for XML → JSON.
4. Click Convert. The result also updates while you type, and errors show the line and column where the problem was found.
5. Copy or download the result. Swap direction puts the output back into the input so you can check the round trip.

How JSON maps to XML

XML and JSON do not have the same data model, so every converter follows a convention. This tool uses the widely used one from the fast-xml-parser library:

• Keys that start with @ become attributes, and the key #text holds the text of an element that also has attributes.
• An array becomes a repeated element with the same name.
• An XML document needs exactly one root element. If your JSON is an object with a single key whose value is an object, that key becomes the root. Otherwise, the whole value is wrapped in the element named in Root element (root by default), and top-level array items become <item> elements.
• Keys that are not valid XML names are fixed: spaces and symbols become _, and a name that starts with a digit gets a leading _ ("1st place" → <_1st_place>).
• null and empty strings give an empty element such as <note/>. Special characters (&, <, >, quotes) are escaped.

How XML maps to JSON

• Attributes become keys prefixed with @, and mixed text becomes #text.
• Repeated elements become an array; an element that appears once becomes a single value.
• CDATA sections are merged into the text, and entities such as & are decoded. The XML declaration, processing instructions and comments are dropped.
• With Convert numbers and booleans, <price>12.5</price> becomes 12.5 and true becomes a boolean, while values with a leading zero, such as 007, stay strings. Turn the option off to keep every value as text.

Before converting, the XML is checked for well-formedness: a missing closing tag, a mismatched tag or an unescaped & is reported with its line and column.