Sync api-endpoints: unsupported block type, update page docstring tweak by @ksinder in https://github.com/makenotion/notion-sdk-js/pull/672
- New string field unsupported[block_type] in UnsupportedBlockObjectResponse to provide a hint on what an underlying unsupported block type is
- Minor TSDoc change for updatePage endpoint: remove "properties" suffix from API name; just "Update page" now.
  - This reflects the fact that the endpoint does more than just updating properties/schema

Full Changelog: https://github.com/makenotion/notion-sdk-js/compare/v5.11.0...v5.11.1
NPM Package: https://www.npmjs.com/package/@notionhq/client/v/5.11.1

Feb 27, 2026

v5.11.0

Add pages.retrieveMarkdown and pages.updateMarkdown endpoints by @ksinder in https://github.com/makenotion/notion-sdk-js/pull/669
Add warnings for unknown parameters passed to API methods by @dimasriat in https://github.com/makenotion/notion-sdk-js/pull/667

Full Changelog: https://github.com/makenotion/notion-sdk-js/compare/v5.10.0...v5.11.0
NPM Package: https://www.npmjs.com/package/@notionhq/client/v/5.11.0

Feb 26, 2026

v5.10.0

Jan 29, 2026

Fix: Prevent path traversal in Client.request() #661
- Note when upgrading: This means that callers can no longer use ../ to switch the meaning of a request that accepts an ID path parameter to navigate to a different Notion API endpoint. Please use Client.request() with a properly formatted, absolute API path instead.

Full Changelog: https://github.com/makenotion/notion-sdk-js/compare/v5.8.0...v5.9.0
NPM Package: https://www.npmjs.com/package/@notionhq/client/v/5.9.0

Jan 23, 2026

Sync api-endpoints: add position to AppendBlockChildrenParameters by @ksinder in https://github.com/makenotion/notion-sdk-js/pull/658
- Specifically, this change is a backwards-compatible improvement to support a more expressive position parameter in the PATCH /v1/blocks/:block_id/children body to append at a specific position in the parent's children array.
  - The parameter cannot be used with the older after parameter, which will be officially removed in the next public API version.
Sync api-endpoints: add list_start_index and list_format by @vshen-notion in https://github.com/makenotion/notion-sdk-js/pull/659
- For numbered_list_item, support distinguishing where list numbering starts and what type of list (number, letter, roman numeral), by exposing list_start_index and list_format

Full Changelog: https://github.com/makenotion/notion-sdk-js/compare/v5.7.0...v5.8.0

Jan 15, 2026

Add 'Contributing' section to README. by @toolness in https://github.com/makenotion/notion-sdk-js/pull/655
Sync api-endpoints: add position to CreatePageBodyParameters by @ksinder in https://github.com/makenotion/notion-sdk-js/pull/656
- Backwards-compatible improvement: support the new, optional position parameter in the POST /v1/pages body, which attaches the newly created page at a specific location in a parent page.
- The parameter cannot be used if the parent is not a regular page.