# [fast-xml-parser](https://www.npmjs.com/package/fast-xml-parser)
Validate XML, Parse XML to JS/JSON and vice versa, or parse XML to Nimn rapidly without C/C++ based libraries and no callback
> This project welcomes **contributors**. If you have a feature you'd like to see implemented or a bug you'd liked fixed, the best and fastest way to make that happen is to implement it and submit a PR. Basic knowledge of JS is sufficient. Feel free to ask for any guidance.
## Users
List of some applications/projects using Fast XML Parser. (Raise an issue to submit yours)
<a href="https://github.com/NaturalIntelligence/imglab" title="imglab" ><img src="https://github.com/NaturalIntelligence/imglab/blob/master/img/imglab_logo.png?raw=true" width="80px" ></a>
<a href="https://github.com/NaturalIntelligence/Stubmatic" title="stubmatic" ><img src="https://camo.githubusercontent.com/ff711425dc2286cd215637b7114eb43e571f001d/68747470733a2f2f6e61747572616c696e74656c6c6967656e63652e6769746875622e696f2f537475626d617469632f696d672f737475626d617469635f6c6f676f2e706e673f7261773d74727565" width="80px" ></a>
<a href="https://github.com/muneem4node/muneem" title="Muneem" ><img src="https://github.com/muneem4node/muneem/raw/master/static/muneem.png?raw=true" width="80px" ></a>
<a href="https://github.com/badges/shields" title="shields" ><img src="https://avatars2.githubusercontent.com/u/6254238" width="80px" ></a>
<a href="https://github.com/renovatebot/renovate" title="renovate" ><img src="https://avatars1.githubusercontent.com/u/38656520" width="80px" ></a>
<a href="https://vmware.com/" title="vmware" > <img src="https://avatars0.githubusercontent.com/u/473334" width="80px" ></a>
<a href="https://opensource.microsoft.com/" title="microsoft" > <img src="https://avatars0.githubusercontent.com/u/6154722" width="80px" ></a>
<a href="https://github.com/notable/notable" title="notable" > <img src="https://avatars3.githubusercontent.com/u/46467536" width="80px" ></a>
<a href="http://ibm.github.io/" title="IBM" > <img src="https://avatars2.githubusercontent.com/u/1459110" width="80px" ></a>
<a href="https://www.ft.com/" title="Financial Times" > <img src="https://avatars2.githubusercontent.com/u/3502508" width="80px" ></a>
<a href="https://github.com/camunda" title="camunda BPM" > <img src="https://avatars3.githubusercontent.com/u/2443838" width="80px" ></a>
<a href="https://github.com/AnyChart" title="AnyChart" > <img src="https://avatars0.githubusercontent.com/u/703373" width="80px" ></a>
<a href="https://github.com/magda-io" title="magda-io" > <img src="https://avatars0.githubusercontent.com/u/40348684" width="80px" ></a>
<a href="https://github.com/geistinteractive" title="Geist Interactive" > <img src="https://avatars0.githubusercontent.com/u/11617965" width="80px" ></a>
<a href="https://www.tourstream.eu/" title="tourstream" > <img src="https://avatars1.githubusercontent.com/u/23242088" width="80px" ></a>
<a href="https://www.atomist.com/" title="Atomist" > <img src="https://avatars3.githubusercontent.com/u/19392" width="80px" ></a>
<a href="http://www.opuscapita.com/" title="OpusCapita" > <img src="https://avatars1.githubusercontent.com/u/23256480" width="80px" ></a>
<a href="https://nevatrip.ru/" title="nevatrip" > <img src="https://avatars2.githubusercontent.com/u/35730984" width="80px" ></a>
<a href="http://www.smartbear.com" title="SmartBear Software" > <img src="https://avatars2.githubusercontent.com/u/1644671" width="80px" ></a>
<a href="http://eosnavigator.com/" title="nevatrip" > <img src="https://avatars1.githubusercontent.com/u/40260563" width="80px" ></a>
<a href="http://nasa.github.io/" title="NASA" > <img src="https://avatars0.githubusercontent.com/u/848102" width="80px" ></a>
<a href="http://qgis.org/" title="QGIS" > <img src="https://avatars2.githubusercontent.com/u/483444" width="80px" ></a>
<a href="http://www.craft.ai/" title="craft ai" > <img src="https://avatars1.githubusercontent.com/u/12046764" width="80px" ></a>
<a href="http://brownspace.org/" title="Brown Space Engineering" > <img src="https://avatars2.githubusercontent.com/u/5504507" width="80px" ></a>
<a href="http://www.appcelerator.com/" title="Team Appcelerator" > <img src="https://avatars1.githubusercontent.com/u/82188" width="80px" ></a>
<a href="https://xmllint.com/" title="XML Lint" > <img src="https://xmllint.com/assets/logo.png" width="80px" ></a>
<a href="https://github.com/prettier" title="Prettier" > <img src="https://avatars0.githubusercontent.com/u/25822731" width="80px" ></a>
<a href="https://github.com/dolanmiu/docx" title="docx" > <img src="https://i.imgur.com/37uBGhO.gif" width="80px" ></a>
<a href="http://orange-opensource.github.io/" title="Open Source by Orange" > <img src="https://avatars3.githubusercontent.com/u/1506386" width="80px" ></a>
<a href="http://www.ybrain.com/" title="YBRAIN Inc." > <img src="https://avatars2.githubusercontent.com/u/38232440" width="80px" ></a>
<a href="http://99bitcoins.com/" title="99 bitcoins" > <img src="https://avatars0.githubusercontent.com/u/9527779" width="80px" ></a>
<a href="https://wechaty.github.io/wechaty/" title="Wechaty" > <img src="https://avatars0.githubusercontent.com/u/21285357" width="80px" ></a>
<a href="https://opendatakit.org" title="Open Data Kit" > <img src="https://avatars0.githubusercontent.com/u/6222985" width="80px" ></a>
<a href="https://ridibooks.com" title="RIDI Books" > <img src="https://avatars1.githubusercontent.com/u/24955411" width="80px" ></a>
<a href="http://signalk.org" title="Signal K" > <img src="https://avatars1.githubusercontent.com/u/7126740" width="80px" ></a>
<a href="http://brain.js.org/" title="brain.js" > <img src="https://avatars2.githubusercontent.com/u/23732838" width="80px" ></a>
<a href="https://skygear.io/" title="Skegear" > <img src="https://avatars1.githubusercontent.com/u/15025887" width="80px" ></a>
<a href="https://npmjs.com/" title="npm" > <img src="https://avatars0.githubusercontent.com/u/6078720" width="80px" ></a>
<a href=" https://www.mindpointgroup.com" title="mindpointgroup" > <img src="https://avatars1.githubusercontent.com/u/6413533" width="80px" ></a>
<a href="http://www.acuantcorp.com/" title="Acuant Inc" > <img src="https://avatars3.githubusercontent.com/u/11580319?s=200&v=4" width="80px" ></a>
<a href="https://www.wazuh.com/" title="wazuh" > <img src="https://avatars2.githubusercontent.com/u/13752566" width="80px" ></a>
<a href="https://orbs.com/" title="ORBS The Hybrid Blockchain" > <img src="https://avatars1.githubusercontent.com/u/33665977" width="80px" ></a>
<a href="https://texlab.netlify.com/" title="latex-lsp" > <img src="https://avatars1.githubusercontent.com/u/48360002" width="80px" ></a>
<a href="https://frontside.io/" title="The Frontside " > <img src="https://avatars1.githubusercontent.com/u/223096" width="80px" ></a>
<a href="https://creditsense.com.au/" title="Credit Sense Australia " > <img src="https://avatars0.githubusercontent.com/u/46947118" width="80px" ></a>
<a href="https://www.hustunique.com/" title="UniqueStudio" > <img src="https://avatars1.githubusercontent.com/u/4847684" width="80px" ></a>
<a href="http://www.openforis.org/" title="Open Foris" > <img src="https://avatars2.githubusercontent.com/u/1212750" width="80px" ></a>
<a href="#" title="NHS Connect" > <img src="https://avatars3.githubusercontent.com/u/20316669" width="80px" ></a>
<a href="https://tradle.io/" title="Tradle" > <img src="https://avatars2.githubusercontent.com/u/9482126" width="80px" ></a>
<a href="http://www.anl.gov/" title="Argonne National Laboratory" > <img src="https://avatars0.githubusercontent.com/u/10468712" width="80px" ></a>
<a href="https://simpleicons.org/" title="Simple Icons" > <img src="https://avatars2.githubusercontent.com/u/29872746" width="80px" ></a>
<a href="https://stoplight.io/" title="Stoplight" > <img src="https://avatars1.githubusercontent.com/u/10767217" width="80px" ></a>
<a href="http://www.fda.gov/" title="Food and Drug Administration " > <img src="https://avatars2.githubusercontent.com/u/6471964" width="80px" ></a>
<a href="http://www.magento.com/" title="Magento" > <img src="https://avatars2.githubusercontent.com/u/168457" width="80px" ></a>
### Join this project as collaborator / maintainer.
[](#backers) [](#sponsors) [](https://snyk.io/test/github/naturalintelligence/fast-xml-parser)
[![NPM quality][quality-image]][quality-url]
[](https://travis-ci.org/NaturalIntelligence/fast-xml-parser)
[](https://coveralls.io/github/NaturalIntelligence/fast-xml-parser?branch=master)
[<img src="https://img.shields.io/badge/Try-me-blue.svg?colorA=FFA500&colorB=0000FF" alt="Try me"/>](https://naturalintelligence.github.io/fast-xml-parser/)
[](https://npm.im/fast-xml-parser)
[quality-image]: http://npm.packagequality.com/shield/fast-xml-parser.svg?style=flat-square
[quality-url]: http://packagequality.com/#?package=fast-xml-parser
<a href="https://opencollective.com/fast-xml-parser/donate" target="_blank">
<img src="https://opencollective.com/fast-xml-parser/donate/button@2x.png?color=blue" width=200 />
</a>
<a href="https://www.patreon.com/bePatron?u=9531404" data-patreon-widget-type="become-patron-button"><img src="https://c5.patreon.com/external/logo/become_a_patron_button.png" alt="Become a Patron!" width="200" /></a>
<a href="https://www.paypal.me/amitkumarguptagwl"> <img src="static/img/support_paypal.svg" alt="Stubmatic donate button" width="200"/></a>
### Main Features
<img align="right" src="static/img/fxp_logo.png" width="180px" alt="FXP logo"/>
* Validate XML data syntactically
* Transform XML to JSON or Nimn
* Transform JSON back to XML
* Works with node packages, in browser, and in CLI (press try me button above for demo)
* Faster than any pure JS implementation.
* It can handle big files (tested up to 100mb).
* Various options are available to customize the transformation
* You can parse CDATA as separate property.
* You can prefix attributes or group them to separate property. Or can ignore them from result completely.
* You can parse tag's or attribute's value to primitive type: string, integer, float, hexadecimal, or boolean. And can optionally decode for HTML char.
* You can remove namespace from tag or attribute name while parsing
* It supports boolean attributes, if configured.
## How to use
To use it in **NPM package** install it first
`$npm install fast-xml-parser` or using [yarn](https://yarnpkg.com/) `$yarn add fast-xml-parser`
To use it from **CLI** Install it globally with `-g` option.
`$npm install fast-xml-parser -g`
To use it on a **webpage** include it from a [CDN](https://cdnjs.com/libraries/fast-xml-parser)
### XML to JSON
```js
var jsonObj = parser.parse(xmlData [,options] );
```
```js
var parser = require('fast-xml-parser');
var he = require('he');
var options = {
attributeNamePrefix : "@_",
attrNodeName: "attr", //default is 'false'
textNodeName : "#text",
ignoreAttributes : true,
ignoreNameSpace : false,
allowBooleanAttributes : false,
parseNodeValue : true,
parseAttributeValue : false,
trimValues: true,
cdataTagName: "__cdata", //default is 'false'
cdataPositionChar: "\\c",
localeRange: "", //To support non english character in tag/attribute values.
parseTrueNumberOnly: false,
arrayMode: false, //"strict"
attrValueProcessor: (val, attrName) => he.decode(val, {isAttributeValue: true}),//default is a=>a
tagValueProcessor : (val, tagName) => he.decode(val), //default is a=>a
stopNodes: ["parse-me-as-string"]
};
if( parser.validate(xmlData) === true) { //optional (it'll return an object in case it's not valid)
var jsonObj = parser.parse(xmlData,options);
}
// Intermediate obj
var tObj = parser.getTraversalObj(xmlData,options);
var jsonObj = parser.convertToJson(tObj,options);
```
As you can notice in above code, validator is not embeded with in the parser and expected to be called separately. However, you can pass `true` or validation options as 3rd parameter to the parser to trigger validator internally. It is same as above example.
```js
try{
var jsonObj = parser.parse(xmlData,options, true);
}catch(error){
console.log(error.message)
}
```
Validator reurns the following object in case of error;
```js
{
err: {
code: code,
msg: message,
line: lineNumber,
},
};
```
#### Note: [he](https://www.npmjs.com/package/he) library is used in this example
<details>
<summary>OPTIONS :</summary>
* **attributeNamePrefix** : prepend given string to attribute name for identification
* **attrNodeName**: (Valid name) Group all the attributes as properties of given name.
* **ignoreAttributes** : Ignore attributes to be parsed.
* **ignoreNameSpace** : Remove namespace string from tag and attribute names.
* **allowBooleanAttributes** : a tag can have attributes without any value
* **parseNodeValue** : Parse the value of text node to float, integer, or boolean.
* **parseAttributeValue** : Parse the value of an attribute to float, integer, or boolean.
* **trimValues** : trim string values of an attribute or node
* **decodeHTMLchar** : This options has been removed from 3.3.4. Instead, use tagValueProcessor, and attrValueProcessor. See above example.
* **cdataTagName** : If specified, parser parse CDATA as nested tag instead of adding it's value to parent tag.
* **cdataPositionChar** : It'll help to covert JSON back to XML without losing CDATA position.
* **localeRange**: Parser will accept non-English character in tag or attribute name. Check #87 for more detail. Eg `localeRange: "a-zA-Zа-яёА-ЯЁ"`
* **parseTrueNumberOnly**: if true then values like "+123", or "0123" will not be parsed as number.
* **arrayMode** : When `false`, a tag with single occurence is parsed as an object but as an array in case of multiple occurences. When `true`, a tag will be parsed as an array always excluding leaf nodes. When `strict`, all the tags will be parsed as array only.
* **tagValueProcessor** : Process tag value during transformation. Like HTML decoding, word capitalization, etc. Applicable in case of string only.
* **attrValueProcessor** : Process attribute value during transformation. Like HTML decoding, word capitalization, etc. Applicable in case of string only.
* **stopNodes** : an array of tag names which are not required to be parsed. Instead their values are parsed as string.
</details>
<details>
<summary>To use from <b>command line</b></summary>
```bash
$xml2js [-ns|-a|-c|-v|-V] <filename> [-o outputfile.json]
$cat xmlfile.xml | xml2js [-ns|-a|-c|-v|-V] [-o outputfile.json]
```
* -ns : To include namespaces (by default ignored)
* -a : To ignore attributes
* -c : To ignore value conversion (i.e. "-3" will not be converted to number -3)
* -v : validate before parsing
* -V : only validate
</details>
<details>
<summary>To use it <b>on webpage</b></summary>
```js
var result = parser.validate(xmlData);
if (result !== true) console.log(result.err);
var jsonObj = parser.parse(xmlData);
```
</details>
### JSON / JS Object to XML
```js
var Parser = require("fast-xml-parser").j2xParser;
//default options need not to set
var defaultOptions = {
attributeNamePrefix : "@_",
attrNodeName: "@", //default is false
textNodeName : "#text",
ignoreAttributes : true,
cdataTagName: "__cdata", //default is false
cdataPositionChar: "\\c",
format: false,
indentBy: " ",
supressEmptyNode: false,
tagValueProcessor: a=> he.encode(a, { useNamedReferences: true}),// default is a=>a
attrValueProcessor: a=> he.encode(a, {isAttributeValue: isAttribute, useNamedReferences: true})// default is a=>a
};
var parser = new Parser(defaultOptions);
var xml = parser.parse(json_or_js_obj);
```
<details>
<summary>OPTIONS :</summary>
With the correct options, you can get the almost original XML without losing any information.
* **attributeNamePrefix** : Identify attributes with this prefix otherwise treat them as a tag.
* **attrNodeName**: Identify attributes when they are grouped under single property.
* **ignoreAttributes** : Don't check for attributes. Treats everything as tag.
* **encodeHTMLchar** : This option has been removed from 3.3.4. Use tagValueProcessor, and attrValueProcessor instead. See above example.
* **cdataTagName** : If specified, parse matching tag as CDATA
* **cdataPositionChar** : Identify the position where CDATA tag should be placed. If it is blank then CDATA will be added in the last of tag's value.
* **format** : If set to true, then format the XML output.
* **indentBy** : indent by this char `when` format is set to `true`
* **supressEmptyNode** : If set to `true`, tags with no value (text or nested tags) are written as self closing tags.
* **tagValueProcessor** : Process tag value during transformation. Like HTML encoding, word capitalization, etc. Applicable in case of string only.
* **attrValueProcessor** : Process attribute value during transformation. Like HTML encoding, word capitalization, etc. Applicable in case of string only.
</details>
## Benchmark
#### XML to JSON
<details>
<summary>report</summary>
| file size | fxp 3.0 validator (rps) | fxp 3.0 parser (rps) | xml2js 0.4.19 (rps) |
| ---------- | ----------------------- | ------------------- | ------------------- |
| 1.5k | 16581.06758 | 14032.09323 | 4615.930805 |
| 1.5m | 14918.47793 | 13.23366098 | 5.90682005 |
| 13m | 1.834479235 | 1.135582008 | -1 |
| 1.3k with CDATA | 30583.35319 | 43160.52342 | 8398.556349 |
| 1.3m with CDATA | 27.29266471 | 52.68877009 | 7.966000795 |
| 1.6k with cdata,prolog,doctype | 27690.26082 | 41433.98547 | 7872.399268 |
| 98m | 0.08473858148 | 0.2600104004 | -1 |
* -1 indicates error or incorrect output.
</details>
#### JSON to XML
<details>
<summary>report</summary>
| file size | fxp 3.2 js to xml | xml2js 0.4.19 builder |
|------------|-----------------|-----------------|
| 1.3k | 160148.9801 | 10384.99401|
| 1.1m | 173.6374831 | 8.611884025|
</details>
### Limitations
Currently FXP fails to parse XML with attributes has ">" in the value. This problem is left open as change in regex for its fix is degrading the performance. And the parser become very slow in case of long attrbute names.
### Worth to mention
- **[BigBit standard)](https://github.com/amitguptagwl/bigbit)** : A standard to represent any number in the universe in comparitively less space and without precision loss. A standard to save memory to represent any text string in comparision of UTF encodings.
- **[imglab](https://github.com/NaturalIntelligence/imglab)** : Speedup and simplify image labeling / annotation. Supports multiple formats, one click annotation, easy interface and much more. There are more than half million images are being annotated every month using this tool.
- [stubmatic](https://github.com/NaturalIntelligence/Stubmatic) : Create fake webservices, DynamoDB or S3 servers, Manage fake/mock stub data, Or fake any HTTP(s) call.
- **[अनुमार्गक (anumargak)](https://github.com/NaturalIntelligence/anumargak)** : The fastest and simple router for node js web frameworks with many unique features.
- [मुनीम (Muneem)](https://github.com/muneem4node/muneem) : A webframework made for all team members. Fast and Featured.
- [शब्दावली (shabdawali)](https://github.com/amitguptagwl/shabdawali) : Amazing human like typing effects beyond your imagination.
## Contributors
This project exists thanks to [all](graphs/contributors) the people who contribute. [[Contribute](CONTRIBUTING.md)].
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## Backers
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>
## Sponsors
Support this project by becoming a sponsor. Your logo will show up here with a link to your website. [[Become a sponsor](https://opencollective.com/fast-xml-parser#sponsor)]
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