Legacy web services and enterprise systems still speak XML, but the modern JavaScript-based tools consuming that data almost always prefer JSON. This tool bridges the two, converting XML into equivalent JSON structure.
Two document philosophies colliding
XML was designed as a markup language first and a data format second — it inherits a document-oriented mindset from its SGML ancestry, with concepts like attributes, mixed content (text interspersed with child elements), namespaces and processing instructions that have no direct equivalent in JSON's simpler, purely data-oriented object/array/value model. This mismatch is exactly why XML-to-JSON conversion is never perfectly clean or fully standardized the way JSON-to-YAML is — different tools make different, reasonable choices about how to represent XML attributes (often prefixed with @ or nested under a special key) and mixed text content within the JSON structure.
How the conversion works
The tool parses your XML into its element tree, then maps each XML element to a JSON object, generally converting attributes into JSON properties (often prefixed to distinguish them from child elements), child elements into nested objects or arrays (arrays when multiple same-named siblings exist), and text content into a designated text property — a widely used but not universally standardized convention, since no single official XML-to-JSON mapping exists.
Where this conversion is genuinely needed
- Integrating legacy XML web services with modern JavaScript applications — front-end applications built with JSON-native tooling frequently need to consume data from older SOAP or XML-based backend services.
- Processing RSS or Atom feeds in JSON-based pipelines — syndication feeds are XML by specification, but many modern feed readers and aggregation tools work internally with JSON, requiring conversion at ingestion.
- Migrating configuration or data from XML-based systems — moving data out of a legacy XML-configured system (like older Java or .NET applications) into a modern JSON-based replacement.
- Working with SVG or other XML-based formats programmatically — some tooling prefers manipulating SVG or similar XML-dialect files as JSON objects rather than raw XML strings for easier programmatic access.
Frequently asked questions
Is there one "correct" way to convert XML to JSON? No — unlike JSON-to-YAML (which is lossless and standardized because YAML is a JSON superset), XML-to-JSON conversion requires design decisions about handling attributes, mixed content and repeated elements that different libraries and tools implement differently, so results can vary slightly depending on which converter is used.
What happens to XML attributes during conversion? Most conversion conventions represent attributes as regular JSON properties, often with a distinguishing prefix (like @id for an attribute named "id") to keep them visually separate from child elements in the resulting JSON object.
Can this conversion handle XML namespaces? Namespaced XML (using prefixes like ns:element) adds another layer of complexity to conversion, since JSON has no native namespace concept — namespace prefixes are typically either preserved literally in the JSON key names or stripped entirely, depending on the specific conversion approach used.
Further reading
W3C — Extensible Markup Language (XML) — The source format's specification, including attributes, namespaces and mixed content this conversion must interpret.
Wikipedia — JSON — The simpler target data model that XML's richer structure must be mapped onto.