Sourced from fast-xml-parser's releases.

fix entity expansion and incorrect replacement and performance

Full Changelog: NaturalIntelligence/fast-xml-parser@v5.5.5...v5.5.6

support onDangerousProperty

Full Changelog: NaturalIntelligence/fast-xml-parser@v5.5.3...v5.5.5

update dependecies to fix typings

Full Changelog: NaturalIntelligence/fast-xml-parser@v5.5.1...v5.5.2

integrate path-expression-matcher

• support path-expression-matcher
• fix: stopNode should not be parsed
• performance improvement for stopNode checking

Separate Builder

XML Builder was the part of fast-xml-parser for years. But considering that any bug in builder may false-alarm the users who are only using parser and vice-versa, we have decided to split it into a separate package.

Migration

To migrate to fast-xml-builder;

From

import { XMLBuilder } from "fast-xml-parser";

To

import  XMLBuilder  from "fast-xml-builder";

XMLBuilder will be removed from current package in any next major version of this library. So better to migrate.

support strictReservedNames

Full Changelog: NaturalIntelligence/fast-xml-parser@v5.3.9...v5.3.9

handle non-array input for XML builder && support maxNestedTags

• support maxNestedTags
• handle non-array input for XML builder when preserveOrder is true (By Angelo Coetzee)
• save use of js properies Full Changelog: NaturalIntelligence/fast-xml-parser@v5.3.7...v5.3.8

CJS typing fix

What's Changed

• Unexport X2jOptions at declaration site by @​Drarig29 in NaturalIntelligence/fast-xml-parser#787

New Contributors

• @​Drarig29 made their first contribution in NaturalIntelligence/fast-xml-parser#787

... (truncated)

Sourced from fast-xml-parser's changelog.

Note: If you find missing information about particular minor version, that version must have been changed without any functional change in this library.

Note: Due to some last quick changes on v4, detail of v4.5.3 & v4.5.4 are not updated here. v4.5.4x is the last tag of v4 in github repository. I'm extremely sorry for the confusion

5.5.9 / 2026-03-23

• combine typing files

4.5.5 / 2026-03-22

apply fixes from v5 (legacy maintenance branch v4-maintenance)

• support maxEntityCount
• support onDangerousProperty
• support maxNestedTags
• handle prototype pollution
• fix incorrect entity name replacement
• fix incorrect condition for entity expansion

5.5.8 / 2026-03-20

• pass read only matcher in callback

5.5.7 / 2026-03-19

• fix: entity expansion limits
• update strnum package to 2.2.0

5.5.6 / 2026-03-16

• update builder dependency
• fix incorrect regex to replace . in entity name
• fix check for entitiy expansion for lastEntities and html entities too

5.5.5 / 2026-03-13

• sanitize dangerous tag or attribute name
• error on critical property name
• support onDangerousProperty option

5.5.4 / 2026-03-13

• declare Matcher & Expression as unknown so user is not forced to install path-expression-matcher

5.5.3 / 2026-03-11

• upgrade builder

5.5.2 / 2026-03-11

• update dependency to fix typings

5.5.1 / 2026-03-10

• fix dependency

... (truncated)

• 870043e update release info
• 6df401e update builder dependency
• bd26122 check for entitiy expansion for lastEntities and html entities too
• 7e70dd8 fix incorrect regex to replace . in entity name
• e54155f update package info
• 3308fd7 handle critical properties
• 0500f6b refactor
• ea07bb2 declare Matcher & Expression as unknown
• 0a4dc92 upgrade builder
• e0a14f7 update dependency to fix typings
• Additional commits viewable in compare view