Sourced from fast-xml-parser's releases.

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: https://github.com/NaturalIntelligence/fast-xml-parser/compare/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: https://github.com/NaturalIntelligence/fast-xml-parser/compare/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

Full Changelog: https://github.com/NaturalIntelligence/fast-xml-parser/compare/v5.3.6...v5.3.7

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

5.4.2 / 2026-03-03

• support maxEntityCount option

5.4.1 / 2026-02-25

• fix (#785) unpairedTag node should not have tag content

5.4.0 / 2026-02-25

• migrate to fast-xml-builder

5.3.9 / 2026-02-25

• support strictReservedNames

5.3.8 / 2026-02-25

• support maxNestedTags
• handle non-array input for XML builder when preserveOrder is true (By Angelo Coetzee)
• save use of js properies

5.3.7 / 2026-02-20

• fix typings for CJS (By Corentin Girard)

5.3.6 / 2026-02-14

• Improve security and performance of entity processing
  • new options maxEntitySize, maxExpansionDepth, maxTotalExpansions, maxExpandedLength, allowedTags,tagFilter
  • fast return when no edtity is present
  • improvement replacement logic to reduce number of calls

5.3.5 / 2026-02-08

• fix: Escape regex char in entity name
• update strnum to 2.1.2
• add missing exports in CJS typings

5.3.4 / 2026-01-30

• fix: handle HTML numeric and hex entities when out of range

5.3.3 / 2025-12-12

• fix #775: transformTagName with allowBooleanAttributes adds an unnecessary attribute

5.3.2 / 2025-11-14

• fix for import statement for v6

5.3.1 / 2025-11-03

... (truncated)

• 4e7ca80 update release info
• 36023b4 fix (#785) unpairedTag node should not have tag content
• b366026 separate builder
• 6f333a8 update release info
• c3ffbab support strictReservedNames
• c692040 update release info
• 107e34c avoid {} to create an empty object
• 60835a4 support maxNestedTags
• f55657c avoid direct call to hasOwnProperty
• c13a961 handle non-array input for XML builder when preserveOrder is true
• Additional commits viewable in compare view

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