NaturalIntelligence

fast-xml-parser

JavaScript

Validate XML, Parse XML and Build XML rapidly without C/C++ based libraries and no callback.

Last updated Jul 8, 2026

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Topics

#cli #command-line #fast #fast-xml-parser #js #js2xml #json #json2xml #locale #parser #rapid #validate #validator #xml #xml2js #xml2json #xml2nimn

Language breakdown

JavaScript 92.7%

TypeScript 4.2%

HTML 3.1%

▸ Files click to expand

README

fast-xml-parser

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

FXP logo

Validate XML data syntactically. Use 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

Bundle size

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

Documents

v3	v4 and v5	v6
documents	Getting Started XML Parser XML Builder XML Validator Entities HTML Document Parsing PI Tag processing Path Expression	Getting Started

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.