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Backers on Open Collective Sponsors on Open Collective Known Vulnerabilities NPM quality Coverage Status Try me NPM total downloads

Validate XML, Parse XML to JS Object, or Build XML from JS Object without C/C++ based libraries and no callback.

Looking for maintainers

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Click on Sponsor button above or Stubmatic donate button


Check ThankYouBackers for our supporters


Check the list of all known users here;

The list of users is collected either from the list published by Github, cummunicated directly through mails/chat , or from other resources. If you feel that your name in the above list is incorrectly published or you're not the user of this library anymore then you can inform us to remove it. We'll do the necessary changes ASAP.

Main Features

FXP logo

  • Validate XML data syntactically
  • Parse XML to JS Object
  • Build XML from JS Object
  • Works with node packages, in browser, and in CLI (press try me button above for demo)
  • Faster than any other pure JS implementation.
  • It can handle big files (tested up to 100mb).
  • Controlled parsing using various options
  • XML Entities, HTML entities, and DOCTYPE entites are supported.
  • unpaired tags (Eg <br> in HTML), stop nodes (Eg <script> in HTML) are supported.
  • You can restore almost same XML from JSON
  • Supports comments
  • It can preserve Order of tags in JS object
  • You can control if a single tag should be parsed into array.
  • Supports parsing of PI (Processing Instruction) tags with XML declaration tags
  • And many more other features.

How to use

To use as package dependency $ npm install fast-xml-parser or $ yarn add fast-xml-parser

To use as system command $ npm install fast-xml-parser -g

To use it on a webpage include it from a CDN


As CLI command

$ fxparser some.xml

In a node js project

const { XMLParser, XMLBuilder, XMLValidator} = require("fast-xml-parser");

const parser = new XMLParser();
let jObj = parser.parse(XMLdata);

const builder = new XMLBuilder();
const xmlContent =;

In a HTML page

<script src="path/to/fxp.min.js"></script>
  const parser = new fxparser.XMLParser();

Check lib folder for different browser bundles

Bundle Name Size
fxbuilder.min.js 5.2K
fxparser.js 50K
fxparser.min.js 17K
fxp.min.js 22K
fxvalidator.min.js 5.7K




  2. XML Parser
  3. XML Builder
  4. XML Validator
  5. Entities
  6. HTML Document Parsing
  7. PI Tag processing


XML Parser

  • Y-axis: requests per second
  • X-axis: File size

Large files

  • Y-axis: requests per second
  • X-axis: File size

XML Builder

  • Y-axis: requests per second

negative means error

Our other projects and research you must try

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    • Single Numeric datatype alternative of integer, float, double, long, decimal and more without precision loss.
  • Cytorus: Be specific and flexible while running E2E tests.
    • Run tests only for a particular User Story
    • Run tests for a route or from a route
    • Customizable reporting
    • Central dashboard for better monitoring
    • Options to integrate E2E tests with Jira, Github etc using Central dashboard Tian.
  • Stubmatic : Create fake webservices, DynamoDB or S3 servers, Manage fake/mock stub data, Or fake any HTTP(s) call.



This project exists thanks to all the people who contribute. [Contribute].


Thank you to all our backers! 🙏 [Become a backer]


  • MIT License

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