JSON to XML converter online: convert JSON data to well-formed XML free

Convert JSON objects, arrays, and nested structures to valid XML instantly, ToolHQ's JSON to XML converter runs entirely in your browser. Your data never leaves your browser.

A JSON to XML converter maps the key-value structure of JSON into the element-based structure of XML. Where JSON uses {"name": "Alice"}, XML uses <name>Alice</name>. The converter handles this translation automatically, including nested objects, arrays, and special characters.

JSON is the dominant format for modern web APIs. XML remains the required format for legacy enterprise systems, SOAP web services, some configuration files, and data interchange formats in healthcare (HL7), finance (FIX), and publishing (DocBook). When you need to send JSON data to a system that expects XML, a converter bridges the gap.

Key takeaways

• ToolHQ converts JSON to valid, well-formed XML in your browser, your data never leaves your browser
• JSON objects become XML elements; JSON values become text content
• Arrays become repeated XML elements with the same tag name
• Nested JSON objects produce nested XML elements
• Free with no account required, handles complex multi-level structures

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How JSON maps to XML

Understanding the mapping rules helps you predict what the output will look like and catch any structural surprises before they cause problems.

Basic object: A JSON key becomes an XML element name. The value becomes the text content of that element.

JSON: {"city": "Paris"}
XML: <city>Paris</city>

Nested object: A JSON object value becomes a nested XML element.

JSON: {"person": {"name": "Alice", "age": 30}}
XML:
<person>
 <name>Alice</name>
 <age>30</age>
</person>

Array: A JSON array produces repeated XML elements with the same tag name.

JSON: {"colors": ["red", "green", "blue"]}
XML:
<colors>red</colors>
<colors>green</colors>
<colors>blue</colors>

Root element: XML requires a single root element. Since JSON objects can have multiple top-level keys, most converters wrap everything in a <root> element by default.

The W3C XML specification defines the rules for well-formed XML documents. Any element name, attribute, and text content in the output must conform to these rules. Wikipedia's JSON article covers the JSON data model and how it compares to other formats.

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When you need JSON to XML conversion

SOAP web services: SOAP APIs (still common in enterprise, banking, and healthcare) require XML envelopes. If your application receives JSON from a REST API but needs to call a SOAP endpoint, you need to convert the data.

Legacy system integration: ERPs, mainframe systems, and older enterprise software often only accept XML. If a modern service provides JSON and you need to feed data into one of these systems, conversion is the bridge.

Healthcare and compliance systems: HL7 v2 and v3, CDA (Clinical Document Architecture), and many regulatory data exchange formats use XML. Converting patient data from a JSON API output to HL7-compliant XML is a common integration task.

Configuration file generation: Some application configs, deployment descriptors (like Maven's pom.xml or Android's AndroidManifest.xml), and infrastructure-as-code templates use XML. If your tooling generates JSON and you need XML, a converter helps.

RSS and Atom feeds: RSS and Atom syndication formats are XML-based. If you have structured data in JSON and want to generate a feed, converting to XML is a practical starting point.

Riku, a backend developer at a logistics company, was integrating a new shipment tracking API (which returned JSON) with his company's warehouse management system (which only accepted XML via a legacy SOAP interface). Rather than writing a manual XML serializer, he used ToolHQ's JSON to XML converter to prototype the output structure quickly, verify the element naming matched the WMS schema, and adjust the mapping before writing the production code. He saved two hours of trial-and-error XML construction.

Convert your JSON to XML now, no upload, no account required

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How to use ToolHQ's JSON to XML converter

1. Open the tool. Go to https://www.toolhq.app/tools/json-to-xml.

2. Paste your JSON. Drop in any valid JSON, a single object, a nested structure, or a JSON array.

3. Convert. Click Convert. The browser processes the JSON locally and generates the XML output.

4. Review the XML. The output is indented and formatted for readability. Check that element names and nesting match your expectations.

5. Copy. Copy the XML output and use it in your application, config file, or API call.

Since the conversion runs locally, your data never leaves your browser. This matters when working with sensitive data structures (customer records, financial data, health information) that should not pass through a third-party server.

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Handling complex JSON structures

Arrays of objects: The most common complex case. Each object in the array produces a group of elements under a repeated parent.

JSON:
{"products": [{"id": 1, "name": "Widget"}, {"id": 2, "name": "Gadget"}]}

XML:
<root>
 <products>
 <id>1</id>
 <name>Widget</name>
 </products>
 <products>
 <id>2</id>
 <name>Gadget</name>
 </products>
</root>

Null values: JSON null becomes an empty XML element (<field/>).

Numbers and booleans: All JSON values become text content in XML, true, false, and 42 appear as-is inside their element tags.

Special characters in keys: JSON allows special characters in keys that are not valid XML element names. Keys starting with numbers, containing spaces, or containing symbols need to be sanitized before they become XML element names. ToolHQ's converter handles common cases, but highly irregular key names may need manual cleanup.

For the reverse conversion, ToolHQ's XML to JSON converter maps XML elements back to JSON keys and values. For working within the JSON ecosystem, the JSON formatter validates and beautifies JSON, and JSON to YAML converts to the human-readable YAML format.

Yasmine, a data engineer at an analytics firm, received a weekly export from a vendor API in JSON format. The reporting dashboard her client used only accepted XML data files. She built a small pipeline that fetched the JSON, used ToolHQ's converter to prototype the XML structure, validated it against the dashboard's schema, and then wrote a Python script that replicated the exact conversion for automated weekly processing. The prototype took 10 minutes; the script took an hour. Without the prototype, the script would have taken a day of guessing at the right XML structure.

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Frequently asked questions

Can JSON and XML represent all the same data?

Not exactly. XML has concepts (attributes, processing instructions, comments, namespaces, CDATA sections) that have no JSON equivalent. JSON has a null value and distinguishes between numbers, strings, booleans, and null, XML has only text. Basic data (objects, arrays, strings, numbers) converts cleanly in both directions; advanced XML features do not map to JSON.

What is the root element in the XML output?

When JSON has multiple top-level keys, the converter wraps them in a <root> element to ensure the output is valid XML (which requires exactly one root element). If your JSON is a single object with one top-level key, that key can serve as the root.

Can I convert a JSON array at the top level?

Yes. A top-level JSON array produces repeated elements inside the root wrapper. Each array item (if it is an object) becomes its own element group.

Does the converter validate the JSON first?

Yes. If your input JSON has syntax errors, the converter returns an error message identifying the problem. Fix the JSON first, then convert.

How should I handle JSON keys that are not valid XML element names?

XML element names cannot start with a number, cannot contain spaces, and cannot include certain symbols. If your JSON has keys like "1st-item" or "data value", the converter will either sanitize them or flag them. Review the output carefully if your JSON has unusual key names.

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The short version

JSON to XML conversion maps JSON's key-value data model to XML's element-based model. Objects become nested elements, arrays become repeated elements, and values become text content. The result is valid XML that legacy systems, SOAP services, and XML-based configs can consume.

ToolHQ's converter handles nested objects and arrays in your browser, your data never leaves your browser. No server receives your data, no account is needed, and the output is formatted and copy-paste ready.

For related data format work, see XML to JSON for the reverse, JSON to YAML for a more readable alternative, and HTML encoder decoder for handling special characters in your output.

Convert JSON to XML free, browser-based, instant, no account

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