# [fast-xml-parser](https://www.npmjs.com/package/fast-xml-parser)

[![NPM total downloads](https://img.shields.io/npm/dt/fast-xml-parser.svg)](https://npm.im/fast-xml-parser)

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

<img align="right" src="static/img/fxp_logo.png" width="180px" alt="FXP logo"/>

* Validate XML data syntactically. Use [detailed-xml-validator](https://github.com/NaturalIntelligence/detailed-xml-validator/) to verify business rules.
* Parse XML to JS Objects and vice versa
* Common JS, ESM, and browser compatible
* Faster than any other pure JS implementation.

It can handle big files (tested up to 100mb). XML Entities, HTML entities, and DOCTYPE entites are supported. Unpaired tags (Eg `<br>` in HTML), stop nodes (Eg `<script>` in HTML) are supported. It can also preserve Order of tags in JS object

---
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## Users

<a href="https://github.com/renovatebot/renovate" title="renovate" ><img src="https://avatars1.githubusercontent.com/u/38656520" width="60px" ></a>
<a href="https://vmware.com/" title="vmware" > <img src="https://avatars0.githubusercontent.com/u/473334" width="60px" ></a>
<a href="https://opensource.microsoft.com/" title="microsoft" > <img src="https://avatars0.githubusercontent.com/u/6154722" width="60px" ></a>
<a href="http://ibm.github.io/" title="IBM" > <img src="https://avatars2.githubusercontent.com/u/1459110" width="60px" ></a>
<a href="http://www.smartbear.com" title="SmartBear Software" > <img src="https://avatars2.githubusercontent.com/u/1644671" width="60px" ></a>
<a href="http://nasa.github.io/" title="NASA" > <img src="https://avatars0.githubusercontent.com/u/848102" width="60px" ></a>
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<a href="https://github.com/baidu" title="Baidu" > <img src="https://avatars.githubusercontent.com/u/13245940?v=4" width="60px" ></a>
[more](./USERs.md)

<small>The list of users are mostly published by Github or communicated directly. Feel free to contact if you find any information wrong.</small>

---

# More about this library

## 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](https://cdnjs.com/libraries/fast-xml-parser)

**Example**

As CLI command
```bash
$ fxparser some.xml
```

In a node js project
```js
const { XMLParser, XMLBuilder, XMLValidator} = require("fast-xml-parser");

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

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

In a HTML page
```html
<script src="path/to/fxp.min.js"></script>
:
<script>
  const parser = new fxparser.XMLParser();
  parser.parse(xmlContent);
</script>
```

Bundle size

| Bundle Name        | Size |
| ------------------ | ---- |
| fxbuilder.min.js   | 6.5K |
| fxparser.min.js    | 20K  |
| fxp.min.js         | 26K  |
| fxvalidator.min.js | 5.7K |

## Documents
<table>
  <tr><td>v3</td><td>v4 and v5</td><td>v6</td></tr>
  <tr>
    <td>
      <a href="./docs/v3/docs.md">documents</a>
    </td>
    <td><ol>
      <li><a href="./docs/v4,v5/1.GettingStarted.md">Getting Started</a></li>
      <li><a href="./docs/v4,v5/2.XMLparseOptions.md">XML Parser</a></li>
      <li><a href="./docs/v4,v5/3.XMLBuilder.md">XML Builder</a></li>
      <li><a href="./docs/v4,v5/4.XMLValidator.md">XML Validator</a></li>
      <li><a href="./docs/v4,v5/5.Entities.md">Entities</a></li>
      <li><a href="./docs/v4,v5/6.HTMLParsing.md">HTML Document Parsing</a></li>
      <li><a href="./docs/v4,v5/7.PITags.md">PI Tag processing</a></li>
      <li><a href="./docs/v4,v5/8.PathExpression.md">Path Expression</a></li>
    </ol></td>
    <td><ol>
      <li></li><a href="./docs/v6/1.GettingStarted.md">Getting Started</a></li>
      <li><a href="./docs/v6/2.Features.md">Features</a></li>
      <li><a href="./docs/v6/3.Options.md">Options</a></li>
      <li><a href="./docs/v6/4.OutputBuilders.md">Output Builders</a></li>
      <li><a href="./docs/v6/5.ValueParsers.md">Value Parsers</a></li>
    </ol></td>
  </tr>
</table>

**note**: 
- Version 6 is released with version 4 for experimental use. Based on its demand, it'll be developed and the features can be different in final release.
- Version 5 has the same functionalities as version 4.

## Performance
<small>negative means error</small>

### XML Parser

<img align="left" src="./docs/imgs/XMLParser_v4.png" width="45%" />
<img src="./docs/imgs/XMLParser_large_v4.png" width="47%" />

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

### XML Builder

<img src="./docs/imgs/XMLBuilder_v4.png" width="50%" />
* Y-axis: requests per second

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---

## Usage Trend

[Usage Trend of fast-xml-parser](https://npm-compare.com/fast-xml-parser#timeRange=THREE_YEARS)
  
<a href="https://npm-compare.com/fast-xml-parser#timeRange=THREE_YEARS" target="_blank">
  <img src="https://npm-compare.com/img/npm-trend/THREE_YEARS/fast-xml-parser.png" width="50%" alt="NPM Usage Trend of fast-xml-parser" />
</a>

# Supporters
#### Contributors

This project exists thanks to [all](graphs/contributors) the people who contribute. [[Contribute](docs/CONTRIBUTING.md)].

<a href="graphs/contributors"><img src="https://opencollective.com/fast-xml-parser/contributors.svg?width=890&button=false" /></a>


#### Backers from Open collective

Thank you to all our backers! 🙏 [[Become a backer](https://opencollective.com/fast-xml-parser#backer)]

<a href="https://opencollective.com/fast-xml-parser#backers" target="_blank"><img src="https://opencollective.com/fast-xml-parser/backers.svg?width=890"></a>



# License
* MIT License

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