3.1.2 • Public • Published


  • Jsonix (JSON interfaces for XML) is a JavaScript library which allows you to convert between XML and JSON structures.
  • With Jsonix you can parse XML into JSON (this process is called unmarshalling) or serialize JSON in XML form (this is called marshalling).
  • These conversions are based on declarative XML/JSON mappings which can be written manually or generated from an XML Schema.

Jsonix advantages:

  • Strongly structured
  • Type-safe
  • Bidirectional
  • (Optionally) XML Schema-driven

See also the other Jsonix features.


Here's a working example for the purchase order schema (try it online in JSFiddle).

Generate mappings

java -jar node_modules/jsonix/lib/jsonix-schema-compiler-full.jar
  -d mappings -p PO purchaseorder.xsd

Generates mappings for the purchaseorder.xsd schema in the mappings\PO.js; mappings will be placed in the variable PO.

Parse XML into JS

// Include or require PO.js so that PO variable is available
// For instance, in node.js:
var PO = require('./mappings/PO').PO;

// First we construct a Jsonix context - a factory for unmarshaller (parser)
// and marshaller (serializer)
var context = new Jsonix.Context([PO]);

// Then we create a unmarshaller
var unmarshaller = context.createUnmarshaller();

// Unmarshal an object from the XML retrieved from the URL
    // This callback function will be provided
    // with the result of the unmarshalling
    function (unmarshalled) {
        // Alice Smith
        // Baby Monitor

You can also unmarshalString, unmarshalDocument and (under node.js) unmarshalFile.

Serialize JS as XML

// Create a marshaller
var marshaller = context.createMarshaller();

// Marshal a JavaScript Object as XML (DOM Document)
var doc = marshaller.marshalDocument({
    name: {
        localPart: "purchaseOrder"
    value: {
        orderDate: { year: 1999, month: 10, day: 20 },
        shipTo: {
            country: "US",
            name: "Alice Smith",
            street: "123 Maple Street",
            city: "Mill Valley",
            state: "CA",
            zip: 90952
        billTo: { /* ... */ },
        comment: 'Hurry, my lawn is going wild!',
        items: { /* ... */ }

You can also marshalString.

Jsonix Features

  • Runs in almost any modern browser
  • Runs in Node.js
  • Runs with CommonJS modules, AMD modules as well as vanilla (globals, without any module loader)
  • Bidirectional (XML -> JS as well as JS -> XML)
  • Implements marshalling (serializing the JavaScript object into XML)
    • Supports string data and DOM nodes as result
  • Implements unmarshalling (parsing a JavaScript object from XML)
    • Supports string data, DOM nodes, URLs or files (with Node.js) as source
  • Driven by declarative XML/JS mappings which control how JavaScript object is converted into XML or vice versa
  • Mappings can be automatically generated based on the XML Schema
  • Strongly-structured - XML/object mappings describe structures of JavaScript objects
  • Strongly-typed - Conversion between string content on XML side and values on the JavaScript side is controlled by declared property types
  • Provides extensible type system
    • Supports most XML Schema simple types (inlcuding QNames)
    • Supports enumerations, list and union simple types
    • Allows adding own simple types
    • Supports complex types consisting of several properties
    • Supports deriving complex types by extension
  • Provides advanced property system
    • Value, attribute, element, element reference properties for string processing of XML content
    • Any attribute, any element properties for "lax" processing for XML content


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