Sourced from qs's changelog.

6.15.2

• [Fix] stringify: skip null/undefined entries in arrayFormat: 'comma' + encodeValuesOnly instead of crashing in encoder
• [Fix] stringify: use configured delimiter after charsetSentinel (#555)
• [Fix] stringify: apply formatter to encoded key under strictNullHandling (#554)
• [Fix] stringify: skip null/undefined filter-array entries instead of crashing in encoder (#551)
• [Fix] parse: handle nested bracket groups and add regression tests (#530)
• [readme] fix grammar (#550)
• [Dev Deps] update @ljharb/eslint-config
• [Tests] add regression tests for keys containing percent-encoded bracket text

6.15.1

• [Fix] parse: parameterLimit: Infinity with throwOnLimitExceeded: true silently drops all parameters
• [Deps] update @ljharb/eslint-config
• [Dev Deps] update @ljharb/eslint-config, iconv-lite
• [Tests] increase coverage

6.15.0

• [New] parse: add strictMerge option to wrap object/primitive conflicts in an array (#425, #122)
• [Fix] duplicates option should not apply to bracket notation keys (#514)

• 9aca407 v6.15.2
• 5e33d33 [Dev Deps] update @ljharb/eslint-config
• 21f80b3 [Fix] stringify: skip null/undefined entries in arrayFormat: 'comma' + `e...
• a0a81ea [Fix] stringify: use configured delimiter after charsetSentinel
• e3062f7 [Fix] stringify: apply formatter to encoded key under strictNullHandling
• 0c180a4 [Fix] stringify: skip null/undefined filter-array entries instead of crashi...
• 3a8b94a [Tests] add regression tests for keys containing percent-encoded bracket text
• 96755ab [readme] fix grammar
• a419ce5 [Fix] parse: handle nested bracket groups and add regression tests
• 3f5e1c5 v6.15.1
• Additional commits viewable in compare view

Sourced from express's releases.

v4.22.2

What's Changed

• fix: restore >20 array parsing for req.query repeated keys (8d09bfe6)
  • This also unifies array-cap behavior across notations. Indexed notation (a[0]=...) was historically capped at qs's default arrayLimit of 20 even in older qs versions; after this change it also allows up to 1000 items.
• deps: qs@~6.15.1
• deps: body-parser@~1.20.5

New Contributors

• @​suuuuuuminnnnnn made their first contribution in expressjs/express#7021
• @​SAY-5 made their first contribution in expressjs/express#7181

Full Changelog: https://github.com/expressjs/express/compare/v4.22.1...v4.22.2

Sourced from express's changelog.

4.22.2 / 2026-05-011

• fix: restore >20 array parsing for req.query repeated keys (8d09bfe6)
  • This also unifies array-cap behavior across notations. Indexed notation (a[0]=...) was historically capped at qs's default arrayLimit of 20 even in older qs versions; after this change it also allows up to 1000 items.
• deps: qs@~6.15.1
• deps: body-parser@~1.20.5

• df0abc9 4.22.2
• 836d366 4.x update qs to 6.15.1, body-parser 1.20.5 (#7224)
• 8d09bfe fix: restore array parsing for req.query repeated keys (#7181)
• d39e8ad deps: body-parser@~1.20.4 (#7021)
• efe85d9 deps: qs@^6.14.1 (#6972)
• f62378e 📝 add note to history
• See full diff in compare view

You can trigger Dependabot actions by commenting on this PR:

• @dependabot rebase will rebase this PR
• @dependabot recreate will recreate this PR, overwriting any edits that have been made to it
• @dependabot show <dependency name> ignore conditions will show all of the ignore conditions of the specified dependency
• @dependabot ignore this major version will close this PR and stop Dependabot creating any more for this major version (unless you reopen the PR or upgrade to it yourself)
• @dependabot ignore this minor version will close this PR and stop Dependabot creating any more for this minor version (unless you reopen the PR or upgrade to it yourself)
• @dependabot ignore this dependency will close this PR and stop Dependabot creating any more for this dependency (unless you reopen the PR or upgrade to it yourself)
  You can disable automated security fix PRs for this repo from the Security Alerts page.