Upload your JSON file and convert it to an XML file quickly and accurately—then download the .xml result to your device.
Converting JSON to XML is straightforward with XConvert's free browser-based tool. No signup, no file uploads to any server — everything runs instantly in your browser.
Paste or load your JSON — Copy your JSON data into the input panel on the left. You can also load a .json file directly from your device. The tool accepts any valid JSON including nested objects, arrays, and primitive values.
Configure conversion settings — Choose your preferred root element name, indentation style, and how arrays should be represented in the XML output. You can also specify whether JSON keys should map to XML elements or attributes.
Convert instantly — Click the convert button and your XML output appears immediately in the right panel. The conversion happens entirely in your browser — no data is sent to any server, keeping your information completely private.
Copy or download the result — Use the copy button to grab the XML output to your clipboard, or download it as an .xml file. You can also continue editing the output directly in the panel before saving.
If you need the reverse operation, try our XML to JSON converter. For other format transformations, check out the JSON to YAML converter or the YAML to XML converter.
JSON to XML conversion is the process of transforming data structured in JavaScript Object Notation (JSON) into Extensible Markup Language (XML). Both are widely used text-based data interchange formats, but they differ fundamentally in syntax, structure, and the ecosystems that rely on them.
JSON uses a lightweight key-value pair syntax with curly braces for objects and square brackets for arrays. It emerged from JavaScript and has become the dominant format for modern web APIs, configuration files, and NoSQL databases. XML, on the other hand, uses a hierarchical tag-based markup structure with opening and closing elements, attributes, namespaces, and a rich schema definition ecosystem. XML remains deeply embedded in enterprise systems, SOAP web services, document formats like SVG and XHTML, and industries such as healthcare (HL7), finance (FIX/FIXML), and government data exchange.
Converting between these formats is a common requirement when integrating modern applications with legacy enterprise systems, when feeding data into SOAP-based APIs, or when generating configuration files for XML-dependent platforms. The conversion is not always one-to-one — JSON's simplicity means certain XML features like attributes, namespaces, and mixed content have no direct JSON equivalent, so the converter must apply conventions to produce well-formed XML from JSON input.
| Feature | JSON | XML |
|---|---|---|
| Syntax | Key-value pairs, arrays | Nested elements with tags |
| Data types | String, number, boolean, null, object, array | All values are text (types via schema) |
| Attributes | No concept of attributes | Elements can have attributes |
| Namespaces | Not supported | Full namespace support |
| Comments | Not supported in spec | Supported (<!-- -->) |
| Schema validation | JSON Schema | XSD, DTD, RelaxNG |
| Array representation | Native [] syntax |
Repeated sibling elements |
| Readability | Compact and concise | Verbose but self-describing |
| Typical use | REST APIs, web apps, config | SOAP APIs, enterprise, document formats |
| Parsing | Built-in in most languages | Requires XML parser library |
Legacy system integration — Many enterprise systems built over the past two decades expose SOAP-based web services that exclusively accept XML. When your application produces JSON data from a modern REST API or database, converting to XML lets you feed that data into these established systems without rewriting their interfaces.
SOAP API communication — SOAP web services require XML request bodies wrapped in specific envelope structures. If your application logic works with JSON internally, converting the payload to XML before wrapping it in a SOAP envelope is a necessary step for communicating with these services.
Enterprise configuration files — Platforms like Java application servers (Tomcat, JBoss), build tools (Maven, Ant), and CI/CD pipelines often use XML configuration files. Converting JSON configuration data to XML allows you to programmatically generate or update these configuration files from modern tooling.
Document format generation — XML underpins many document and graphic formats including SVG, XHTML, EPUB, and Office Open XML. Converting structured JSON data into XML is a first step toward generating these document types programmatically.
Healthcare and financial data exchange — Industries like healthcare (HL7 CDA, FHIR XML), finance (FIXML, ISO 20022), and government use XML-based standards for regulatory data exchange. JSON data from internal systems often needs conversion to these XML standards for compliance and interoperability.
Cross-platform data migration — When migrating data between systems where the source outputs JSON and the destination requires XML, a reliable conversion tool bridges the gap without requiring custom transformation scripts for each migration.
The core challenge in JSON to XML conversion lies in the fundamental structural differences between the two formats. JSON is built around two structures: objects (unordered key-value pairs) and arrays (ordered lists of values). XML is built around elements that can contain text content, child elements, and attributes, organized in a strict hierarchical tree. Mapping between these models requires a set of conventions since there is no single canonical way to represent JSON in XML.
Object keys in JSON naturally map to XML element names, and primitive values become the text content of those elements. For example, {"name": "Alice"} becomes <name>Alice</name>. However, complications arise with arrays. JSON arrays have no direct XML equivalent — the common convention is to represent each array item as a repeated sibling element with the same tag name. For instance, {"items": [1, 2, 3]} might become <items>1</items><items>2</items><items>3</items>, or alternatively wrapped in a parent element like <items><item>1</item><item>2</item><item>3</item></items>. The choice of convention affects whether the XML can be cleanly converted back to JSON.
Another significant consideration is the attribute versus element decision. XML elements can carry attributes (<user id="5">) which have no JSON counterpart. When converting from JSON to XML, all values typically become child elements since JSON has no way to distinguish what should be an attribute. Some converters use conventions like prefixing keys with @ to signal attribute mapping, but this requires the JSON to be pre-structured with that convention in mind. Namespace handling presents a similar challenge — XML namespaces are critical for avoiding element name collisions in complex documents, but JSON has no namespace concept. If the target XML schema requires namespaces, they must be configured as part of the conversion settings or injected post-conversion.
Validate your JSON first — Make sure your input is valid JSON before converting. Even a missing comma or unmatched bracket will prevent conversion. Use XConvert's JSON formatter to validate and clean up your JSON before converting.
Choose a meaningful root element — XML requires a single root element. If your JSON is an object, the converter can use a default root, but specifying a descriptive root element name (like <order> or <employees>) makes the output more readable and schema-compliant.
Plan your array handling strategy — Decide whether arrays should produce repeated sibling elements or be wrapped in a container element. The wrapped approach (<items><item>...</item></items>) is generally safer for round-trip conversion and schema validation.
Watch for invalid XML element names — JSON keys can contain characters that are illegal in XML element names (spaces, starting with numbers, special characters). Good converters handle this automatically, but review the output if your JSON has unusual key names.
Handle null values deliberately — JSON null has no standard XML representation. It might become an empty element (<field/>), an element with an xsi:nil attribute, or be omitted entirely. Know what your target system expects.
Test with your target system — After conversion, validate the XML against the target system's XSD schema if one exists. Structural correctness doesn't guarantee semantic correctness — the element names, nesting, and data types must match what the consuming system expects.
Nested JSON objects are converted into nested XML elements, preserving the hierarchical structure. For example, {"user": {"name": "Alice", "address": {"city": "Seattle"}}} becomes <user><name>Alice</name><address><city>Seattle</city></address></user>. Each level of nesting in JSON corresponds to a level of element nesting in XML, so deeply nested JSON produces deeply nested XML. The converter maintains the full depth of your data structure.
JSON arrays are converted to repeated XML elements since XML has no native array type. By default, each array item becomes a sibling element with the same tag name derived from the parent key. For example, {"colors": ["red", "blue"]} typically becomes <colors>red</colors><colors>blue</colors> or <colors><color>red</color><color>blue</color></colors> depending on the wrapping configuration. You can configure how arrays are handled in the conversion settings.
Standard JSON has no concept of attributes, so by default all JSON values become XML elements. However, some conversion conventions use a prefix like @ to designate attributes. For example, {"user": {"@id": "5", "name": "Alice"}} would produce <user id="5"><name>Alice</name></user>. Check whether your target system requires attributes and structure your JSON accordingly before converting.
Yes. XConvert's JSON to XML converter runs entirely in your browser using client-side JavaScript. Your data never leaves your device — no files are uploaded to any server, no data is transmitted over the network, and nothing is stored or logged. This makes it safe to use with sensitive or proprietary data.
JSON has no namespace concept, so namespaces cannot be automatically derived from JSON input. If your target XML requires namespaces, you have two options: add namespace declarations manually to the converted XML output, or pre-structure your JSON with namespace prefixes in the key names (e.g., "soap:Envelope") and configure the converter to preserve them. For complex namespace requirements, post-processing the output is often the most practical approach.
Since the conversion runs entirely in your browser, the limit depends on your device's available memory and browser capabilities. Most modern browsers handle JSON files up to 50–100 MB without issues. For very large files, you may experience slower performance. If you're working with extremely large datasets, consider splitting the JSON into smaller chunks before converting.
The converter produces well-formed XML output, but it does not perform XSD validation. After conversion, you can take the XML output and validate it against your XSD using a dedicated XML validator. If validation fails, you may need to adjust the conversion settings (root element name, array handling, attribute mapping) to match the expected schema structure.
JSON booleans (true, false) are converted to their string equivalents as text content within XML elements: <active>true</active>. JSON null values are typically represented as empty elements (<field/> or <field></field>). Since XML treats all content as text, the consuming application is responsible for interpreting these string values as their appropriate data types, often guided by an XSD schema.
The converter preserves the order of keys as they appear in your JSON input. While the JSON specification states that object key order is not guaranteed, in practice most JSON parsers and this converter maintain insertion order. The resulting XML elements will appear in the same sequence as the keys in your source JSON, which is important for XML documents where element order can be schema-significant.
Yes, but with an additional step. The converter transforms your JSON data into XML elements, but a SOAP request requires a specific envelope structure (<soap:Envelope>, <soap:Header>, <soap:Body>). Convert your JSON payload to XML first, then wrap the result inside the appropriate SOAP envelope elements with the correct namespace declarations. This two-step approach gives you full control over the SOAP structure while automating the data conversion. You might also find our XML formatter helpful for cleaning up the final SOAP message.