JSON ↔ XML Converter
Bridge modern REST APIs and legacy XML systems. Handles nested objects, auto-detects arrays from repeated tags.
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JSON ↔ XML Converter
The JSON ↔ XML Converter is a professional utility designed for developers, data analysts, and IT professionals who need to quickly and safely transform data between these two widely-used formats. Whether you are working on REST API responses, legacy system integrations, configuration files, or data migrations, this tool provides a clean and reliable way to handle your conversions.
Why use JSON ↔ XML Converter?
JSON (JavaScript Object Notation) and XML (eXtensible Markup Language) are both cornerstones of modern data exchange, but they serve different ecosystems. JSON is the dominant format for web APIs, mobile applications, and NoSQL databases — valued for its compact syntax and native JavaScript compatibility. XML remains essential in enterprise integrations, SOAP web services, document formats (like SVG and XHTML), and systems that require schema validation with XSD or DTD.
Where each format is typically used
| Format | Common Use Cases |
|---|---|
| JSON | REST APIs, mobile apps, NoSQL databases, modern web applications |
| XML | SOAP web services, enterprise integrations (SAP, ERP), SVG, XHTML, Android resources, RSS/Atom feeds |
Our converter bridges these two worlds. It handles complex nested objects and arrays, preserves text content faithfully, and provides human-readable, well-indented output in both directions.
Key Features
- Bi-directional Conversion: Switch between JSON → XML and XML → JSON with a single toggle.
- Nested Structure Support: Correctly converts deeply nested objects and arrays in both directions.
- Automatic Array Detection: When multiple sibling XML elements share the same tag name, they are automatically grouped into a JSON array.
- Pretty-Printed Output: All results are formatted with consistent indentation for maximum readability.
- Safe Parsing: Uses standard libraries without executing any embedded code in the input.
JSON vs XML at a Glance
| Feature | JSON | XML |
|---|---|---|
| Human readability | Good | Moderate |
| Verbosity | Compact | Verbose (opening + closing tags) |
| Data types | Native (number, boolean, null) | Everything is text (no native types) |
| Arrays | Native ([]) |
Repeated sibling elements |
| Comments | Not supported | Supported (<!-- -->) |
| Schema validation | JSON Schema | XSD, DTD, RelaxNG |
| Attributes | Not applicable | Supported (not converted by this tool) |
How the Conversion Works
JSON → XML: Each JSON object key becomes an XML element tag. Arrays are represented as repeated <item> child elements within a parent tag. The entire structure is wrapped in a <root> element, and the result includes a standard XML declaration (<?xml version="1.0" encoding="UTF-8"?>).
XML → JSON: The root element is unwrapped and its children form the top-level JSON object keys. Repeated sibling elements with the same tag name are automatically merged into a JSON array. Note that since XML has no native type system, all values in the JSON output are strings.
Example Conversion
JSON Source:
{
"project": "Calculyo",
"meta": {
"version": "2",
"active": "true"
},
"tags": ["web", "tools"]
}
XML Result:
<?xml version="1.0" encoding="UTF-8"?>
<root>
<project>Calculyo</project>
<meta>
<version>2</version>
<active>true</active>
</meta>
<tags>
<item>web</item>
<item>tools</item>
</tags>
</root>
live_help Frequently Asked Questions (FAQ)
What is the difference between JSON and XML?
JSON is a lightweight, text-based format derived from JavaScript object syntax. It uses key–value pairs, arrays, and nested objects, and is the standard choice for modern REST APIs and web applications. XML is a markup language that uses opening and closing tags to structure data hierarchically. It is more verbose but supports attributes, namespaces, schemas (XSD), and document-centric use cases like XHTML or SVG.
JSON Example:
{
"user": "Anna",
"roles": ["admin", "editor"]
}
XML Equivalent:
<?xml version="1.0" encoding="UTF-8"?>
<root>
<user>Anna</user>
<roles>
<item>admin</item>
<item>rails</item>
</roles>
</root>
How are JSON arrays represented in XML?
Arrays in JSON are converted to repeated <item> child elements inside the array’s parent tag. For example, "tags": ["a", "b"] becomes <tags><item>a</item><item>b</item></tags>. When converting back from XML to JSON, repeated sibling elements with the same tag name are automatically grouped into a JSON array.
Why do numbers and booleans become strings in XML → JSON?
XML has no built-in type system — all element content is plain text. When converting XML to JSON, all values are returned as strings because there is no way to reliably infer whether <age>30</age> should be the number 30 or the string "30". If you need typed values in the JSON output, apply a post-processing step in your application.
What happens to the XML root element during XML → JSON conversion?
The root element is unwrapped. Its child elements become the top-level keys of the resulting JSON object. For example, <root><name>John</name></root> produces {"name": "John"}, not {"root": {"name": "John"}}.
Does this tool handle XML attributes?
No. XML attributes (e.g., <user id="42">John</user>) are currently not included in the JSON output — only element text content and child elements are converted. If your XML relies heavily on attributes, consider restructuring it to use child elements before converting.
When should I use JSON and when XML?
Choose JSON when building modern REST APIs, working with JavaScript-based applications, or when file size and parsing speed matter. Choose XML when integrating with enterprise systems (SOAP, SAP, ERP), working with document-centric data that needs schema validation (XSD), or dealing with legacy systems that require XML. For configuration files, consider YAML instead — it offers the best human readability.
Why do I get an “XML Error” message?
XML is strict about well-formedness: every opening tag must have a matching closing tag, attributes must be quoted, and the document must have a single root element. Common mistakes include unclosed tags, unescaped & or < characters in text content, or missing the root wrapper. The error message will point you to the line and column where the problem was found.