JSON to XML Converter: Transform JSON for SOAP and Legacy APIs

What Is XML and How Does It Differ from JSON?

XML (Extensible Markup Language) is a text-based markup format designed for both human-readable and machine-readable data. Unlike JSON, XML supports attributes on elements, mixed content (elements containing both text and child elements), namespaces, and a rich ecosystem of standards (XSLT, XPath, XQuery, XML Schema).

JSON and XML represent similar hierarchical structures but with different syntax. JSON objects map naturally to XML elements, and JSON arrays map to sequences of sibling elements with the same tag name. The main challenge is that XML requires every document to have a single root element, while a JSON document can be an array at the root level.

The key structural differences matter when designing a mapping: XML attributes have no direct JSON equivalent (they are typically represented as `@attr` keys in intermediate formats like BadgerFish or Google JSON Style), and XML mixed content (element with both text and children) has no clean JSON equivalent.

• JSON object → XML element with child elements for each key
• JSON array → repeated sibling XML elements with the same tag name
• JSON string/number/boolean → XML element text content
• JSON null → empty XML element or element with `xsi:nil` attribute
• JSON root array → requires a wrapper root element (e.g., `<root>`)

How to Use This Tool

The converter produces valid XML from any JSON input. Configure the root element name and attribute convention to match your target schema.

1. 1

   Paste your JSON

   Paste the JSON object or array you want to convert into the input panel.

2. 2

   Set the root element name

   Enter a name for the XML root element (default: `root`). This is required when your JSON is an array, since XML requires a single root.

3. 3

   Choose attribute handling

   Decide whether keys prefixed with `@` should become XML attributes or regular child elements. Select the convention that matches your target system.

4. 4

   Convert

   Click Convert to generate the XML. The output is validated for well-formedness before display.

5. 5

   Copy or download

   Copy the XML to your clipboard or download it as a `.xml` file to use in your SOAP client, XSLT transform, or legacy system import.

Common Use Cases

JSON-to-XML conversion is a common integration task in enterprise and government technology environments.

• SOAP web service integration — convert REST API JSON responses to XML request bodies for legacy SOAP services that do not accept JSON.
• XSLT transformation pipelines — feed converted XML into XSLT stylesheets to produce HTML reports, PDFs, or other XML dialects.
• EDI and financial systems — insurance, banking, and government systems often mandate XML formats (HL7, SWIFT, UBL); convert modern JSON data to these schemas.
• Configuration file migration — some older systems use XML-based configuration; convert JSON config to XML for migration or dual-format support.
• RSS and Atom feed generation — generate RSS or Atom feed XML from a JSON data source (blog posts, news items) for syndication.

Tips and Best Practices

XML is more rigid than JSON — a few conventions make the conversion smoother and the output more useful.

• Validate the output XML — use an XML validator or schema validator to confirm the converted XML matches the schema expected by the target system.
• Handle namespaces manually — the basic converter does not add XML namespace declarations; add these manually to the output if your target schema requires them.
• Use descriptive element names — JSON keys that are valid JSON but not valid XML element names (e.g., starting with a number) need to be renamed before conversion.
• Test with the target system early — different XML parsers have different tolerance for element ordering, whitespace, and encoding declarations; test the converted XML in the target environment quickly.
• Consider XSLT for complex mappings — if you need to restructure the XML significantly (reorder elements, add attributes, apply conditionals), use an XSLT transform rather than relying on a one-to-one JSON-to-XML mapping.

Frequently Asked Questions