Monthly Downloads: 0
Programming language: JavaScript
License: MIT License
Tags: Parsing    
Latest version: v3.17.1

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

Looking for maintainers

Check ThankYouBackers for our contributors



Check the list of all known users [here](./USERs.md);

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

  • 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("../src/fxp");

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

const builder = new XMLBuilder();
const xmlContent = builder.build(jObj);

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



  • [documents](./docs/v3/docs.md)


  1. [GettingStarted.md](./docs/v4/1.GettingStarted.md)
  2. [XML Parser](./docs/v4/2.XMLparseOptions.md)
  3. [XML Builder](./docs/v4/3.XMLBuilder.md)
  4. [XML Validator](./docs/v4/4.XMLValidator.md)
  5. [Entities](./docs/v4/5.Entities.md)
  6. [HTML Document Parsing](./docs/v4/6.HTMLParsing.md)
  7. [PI Tag processing](./docs/v4/7.PITags.md) ## Performance

XML Parser


Large files [](./docs/imgs/XMLParser_large_v4.png)

XML Builder


negative means error

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    • 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](graphs/contributors) the people who contribute. [[Contribute](docs/CONTRIBUTING.md)]. <!-- --> <!--

Lead Maintainers

Amit Gupta Vohmyanin Sergey Vasilevich

All Contributors -->


Thank you to all our backers! ๐Ÿ™ [Become a backer]


[Become a sponsor] Support this project by becoming a sponsor. Your logo will show up here with a link to your website. Please also share your detail so we can thankyou on SocialMedia.


  • MIT License

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*Note that all licence references and agreements mentioned in the fast-xml-parser README section above are relevant to that project's source code only.