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Port of Python's Element Tree module to Node.js
JavaScript Makefile
Latest commit addf431 @Kami Kami Update changelog.


node-elementtree is a Node.js XML parser and serializer based upon the Python ElementTree v1.3 module.


$ npm install elementtree

Using the library

For the usage refer to the Python ElementTree library documentation -

Supported XPath expressions in find, findall and findtext methods are listed on

Example 1 – Creating An XML Document

This example shows how to build a valid XML document that can be published to Atom Hopper. Atom Hopper is used internally as a bridge from products all the way to collecting revenue, called “Usage.” MaaS and other products send similar events to it every time user performs an action on a resource (e.g. creates,updates or deletes). Below is an example of leveraging the API to create a new XML document.

var et = require('elementtree');
var XML = et.XML;
var ElementTree = et.ElementTree;
var element = et.Element;
var subElement = et.SubElement;

var date, root, tenantId, serviceName, eventType, usageId, dataCenter, region,
checks, resourceId, category, startTime, resourceName, etree, xml;

date = new Date();

root = element('entry');
root.set('xmlns', '');

tenantId = subElement(root, 'TenantId');
tenantId.text = '12345';

serviceName = subElement(root, 'ServiceName');
serviceName.text = 'MaaS';

resourceId = subElement(root, 'ResourceID');
resourceId.text = 'enAAAA';

usageId = subElement(root, 'UsageID');
usageId.text = '550e8400-e29b-41d4-a716-446655440000';

eventType = subElement(root, 'EventType');
eventType.text = 'create';

category = subElement(root, 'category');
category.set('term', 'monitoring.entity.create');

dataCenter = subElement(root, 'DataCenter');
dataCenter.text = 'global';

region = subElement(root, 'Region');
region.text = 'global';

startTime = subElement(root, 'StartTime');
startTime.text = date;

resourceName = subElement(root, 'ResourceName');
resourceName.text = 'entity';

etree = new ElementTree(root);
xml = etree.write({'xml_declaration': false});

As you can see, both et.Element and et.SubElement are factory methods which return a new instance of Element and SubElement class, respectively. When you create a new element (tag) you can use set method to set an attribute. To set the tag value, assign a value to the .text attribute.

This example would output a document that looks like this:

<entry xmlns="">
  <category term="monitoring.entity.create"/>
  <StartTime>Sun Apr 29 2012 16:37:32 GMT-0700 (PDT)</StartTime>

Example 2 – Parsing An XML Document

This example shows how to parse an XML document and use simple XPath selectors. For demonstration purposes, we will use the XML document located at

Behind the scenes, node-elementtree uses Isaac’s sax library for parsing XML, but the library has a concept of “parsers,” which means it’s pretty simple to add support for a different parser.

var fs = require('fs');

var et = require('elementtree');

var XML = et.XML;
var ElementTree = et.ElementTree;
var element = et.Element;
var subElement = et.SubElement;

var data, etree;

data = fs.readFileSync('document.xml').toString();
etree = et.parse(data);

console.log(etree.findall('./entry/TenantId').length); // 2
console.log(etree.findtext('./entry/ServiceName')); // MaaS
console.log(etree.findall('./entry/category')[0].get('term')); // monitoring.entity.create
console.log(etree.findall('*/category/[@term="monitoring.entity.update"]').length); // 1

Build status

Build Status


node-elementtree is distributed under the Apache license.

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