XML ↔ JSON Converter
Convert between XML and JSON formats quickly and easily.
What Is XML to JSON Conversion?
XML (eXtensible Markup Language) and JSON (JavaScript Object Notation) are two foundational data interchange formats used across virtually every area of software development. XML uses a tag-based, hierarchical structure with opening and closing elements, while JSON uses a lightweight key-value pair syntax with braces and brackets. Converting between them is one of the most common data transformation tasks developers face.
XML has been the dominant format for enterprise systems, SOAP web services, and document-oriented data since the late 1990s. JSON emerged as a simpler alternative and became the standard for REST APIs, modern web applications, and mobile backends. Many projects require bridging these two worlds.
How Does the Conversion Work?
Converting between XML and JSON involves mapping structural concepts:
- XML elements become JSON object keys, with their text content as values.
- XML attributes are typically prefixed (e.g.,
@attributeName) to distinguish them from child elements. - Repeated elements (siblings with the same tag name) are grouped into JSON arrays.
- Mixed content (elements containing both text and child elements) requires special handling, often using a
#textkey. - JSON to XML reverses the process: object keys become element names, arrays become repeated elements, and primitives become text content.
Common Use Cases
- API Integration: Legacy SOAP services return XML, but modern front-ends expect JSON. Converting XML responses to JSON enables seamless integration.
- Data Migration: When migrating from older enterprise systems (often XML-based) to modern microservices (JSON-based), bulk conversion is essential.
- Configuration Files: Some frameworks use XML configs (e.g., .NET
web.config, Mavenpom.xml) while others use JSON. Converting between them simplifies cross-platform development. - Document Processing: RSS feeds, SVG files, and Office documents use XML internally. Extracting data into JSON makes it easier to process programmatically.
- Testing & Debugging: Viewing XML data as JSON (or vice versa) can make complex nested structures easier to understand and validate.
XML vs JSON: Key Differences
| Feature | XML | JSON |
|---|---|---|
| Syntax | Tag-based with opening/closing elements | Key-value pairs with braces and brackets |
| Readability | Verbose but self-documenting | Compact and easy to scan |
| Attributes | Supported natively | No direct equivalent |
| Comments | Supported (<!-- -->) | Not supported |
| Schema Validation | XSD, DTD, RelaxNG | JSON Schema |
| Namespaces | Supported | Not supported |
| Typical Use | Enterprise, SOAP, documents | REST APIs, web apps, configs |
Frequently Asked Questions
Is the conversion lossless?
For most common structures, yes. However, XML features like attributes, namespaces, processing instructions,
and CDATA sections do not have direct JSON equivalents, so conventions (like @ prefixes) are
used to preserve them. Simple element-based XML converts cleanly in both directions.
How are XML attributes handled in JSON?
Attributes are typically represented as keys with a special prefix (commonly @) within the
parent element's JSON object. This distinguishes them from child elements.
Can I convert large XML files?
This tool handles typical configuration and data files. For very large files (multi-megabyte), consider using a streaming parser or command-line tool for better performance.