squash-xml-json
v0.1.0
Published
A library to convert XML data to a flat JSON structure, and back.
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Squash XML JSON
A library to convert XML data to a flat JSON structure, and back.
This is a library suited for those who think of XML as an asset, not a nuisance. It aims to offers a simple and efficient way of manipulating XML documents without a DOM.
Squash XML JSON can handle:
- mixed content
- namespaces and namespace prefixes
- two-way transformation XML <=> JSON
Dependencies
- requires sax.js (browser build will bundle it)
Installation
npm install squash-xml-jsonTo build and test:
npm run build && npm test
# to build for use in browser
npm run build-webUsage
ES6
import {flattenXML, hydrateXML} from "squash-xml-json"node
var sxj = require("squash-xml-json")Browser
<script src="squash-xml-json-web.js"></script>
<script>console.log(sxj)</script>XML to JSON: flattenXML()
Squash XML JSON creates a flat structure of "nodes", each identified by an UUID or an element's xml:id attribute when present.
This simplifies element lookup in the JSON structure.
let xml = `<text xmlns="http://www.tei-c.org/ns/1.0">
<body>
<p xml:id="p1">Some <emph>text</emph> here.</p>
</body>
</text>`
let json = flattenXML(xml)This will result in a JSON object containing each XML node. An element will look like this:
{
'p1': {
'name': 'p',
'children': ['>td8340e43',
'>eeb0d435c',
'>t11da3f7e'
],
'@': {
'xml:id': 'p1'
},
'ns': {
'': 'http://www.tei-c.org/ns/1.0'
},
'parent': '>ed8b1db33',
'id': 'p1'
}
}The element includes its children's and parent's IDs, which can be used to retrieve those nodes directly form the JSON object. Note that the ID of this element p1 is derived from its xml:id attribute, while other elements get assigned a UUID (truncated in the example).
Before root
The IDs of processing instructions and text nodes before the root element are listed in a dedicated property called >before_root.
{
'>before_root': ['>t8b1ef55d'],
'>t8b1ef55d': {
'pi' {
name: 'xml',
'body': 'version="1.0" encoding="utf-8"'
}
}
}Options
Set skipSpace to true to exclude empty text nodes. Do this if you want a leaner JSON and don't care about pretty printing or preserving original spacing.
flattenXML(xml, {skipSpace : true})JSON to XML: hydrateXML()
Use hydrateXML To serialize a compliant JSON structure back into an XML string:
let json = {
'>before_root': [],
'>ee0c1ac32': {
name: 'root',
children: ['>e3cadaf0c'],
'@': {},
ns: {},
parent: null,
id: '>ee0c1ac32'
},
'>e3cadaf0c': {
name: 'el',
children: ['>t62d02a9f'],
'@': {},
ns: {},
parent: '>ee0c1ac32',
id: '>e3cadaf0c'
},
'>t62d02a9f': {
t: 'text',
parent: '>e3cadaf0c'
}
}
hydrateXML(json)
//returns "<root><el>text</el></root>"