TEST XML PARSER

Testing of nodejs memory consumption for two xml files (parse to json), one of 20 KB and another of 30 MB

library	Memory usage		Memory release (time)	Convert XML to JSON
	20 KB file	31 MB file
libxmljs	8.6 MB	411.8 MB	10~20 sec	No
xml2js	15.1 MB	70.8 MB	> 60 sec	Yes
xml-js	12.3 MB	420.6 MB	> 60 sec	Yes
xml2json	11.4 MB	147.9 MB	30~40 sec	Yes
fast-xml-parser	8.9 MB	396.4 MB	30~40 sec	Yes

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Example libraries options

libxmljs

Don't convert the xml to json, you must navigate through the nodes of the xml

• Documentation link
• Example link

Options to remove blanks

const libxmljs = require('libxmljs')

const xmlDoc = libxmljs.parseXml(xml, { blanks: false })

xml2js

• Documentation link
• Example link

Default options

const xml2js = require('xml2js')

const parser = new xml2js.Parser()

parser.parseStringPromise(xml)
	.then(console.log)
	.catch(console.error)

Options added

const xml2js = require('xml2js')

const parser = new xml2js.Parser({
	trim: true, // Trim the whitespace at the beginning and end of text nodes
	mergeAttrs: true, // Merge attributes and child elements as properties of the parent
	explicitArray: false // An array is created only if there is more than one.
})

parser.parseStringPromise(xml)
	.then(console.log)
	.catch(console.error)

xml-js

• Documentation link
• Example link

Default options

const xmljs = require('xml-js')

const xmlDoc = xmljs.xml2js(xml)

Options added

const xmljs = require('xml-js')

const xmlDoc = xmljs.xml2js(xml, {
	ignoreComment: true,
	compact: true, // Whether to produce detailed object or compact object.
	trim: true, // Whether to trim whitespace characters that may exist before and after the text.
	nativeType: true, // Converting text of numerals or of boolean values to native type
	nativeTypeAttributes: true // Converting text of numerals or of boolean values to native type
})

xml2json

• Documentation link
• Example link

Default options

const xml2json = require('xml2json')

const xmlDoc = xml2json.toJson(xml)

Options added

const xml2json = require('xml2json')

const xmlDoc = xml2json.toJson(xml, {
	object: true, // Returns a Javascript object instead of a JSON string
	coerce: true, // Converting text of numerals or of boolean values to native type
	alternateTextNode: true // Changes the default textNode property from $t to _t
})

fast-xml-parser

• Documentation link
• Example link

Default options

const parser = require('fast-xml-parser')

const xmlDoc = parser.parse(xml)

Options added

const parser = require('fast-xml-parser')

const xmlDoc = parser.parse(xml, {
	attributeNamePrefix: '_', // Given string to attribute name for identification, default @_
	textNodeName: '_t', // Given string to text node name for identification, default #text
	ignoreAttributes: false, // Ignore attributes to be parsed
	ignoreNameSpace: true, // Remove namespace string from tag and attribute names
	parseAttributeValue: true // Parse the value of an attribute to float, integer, or boolean
})