service · inferred from evidence

Notion API

A hosted API service provided by Notion for programmatic access to its data.

Notion API calls from the browser are blocked by CORS policy
I am trying to call the Notion API directly from a webpage with the JavaScript SDK, but the browser blocks every request with a CORS policy error. Shouldn't this be fixable server-side by adding `Access-Control-Allow-Origin: *` to the respo
primary2026-09-23 13:08 UTC

Skills in this topic

Notion API 403 restricted_resource: the integration can see the page but not do that
Fixes Notion MCP calls 403ing with restricted_resource on a shared page. Use when the page is shared with the integration but writes or reads are refused. Not for 404 object_not_found or bad tokens.
AxiosError: Request failed with status code 401 (Notion MCP not sending the Authorization header)
Fixes the Notion MCP server 401ing because it never attaches the Authorization header. Use when the token is valid via curl but the server sends requests without it. Not for misquoted headers or unshared pages.
401 Unauthorized: API token is invalid (Notion MCP in Claude Code)
Fixes the Notion MCP server 401ing in Claude Code with a token that works elsewhere. Use when the same token succeeds in the Notion API directly. Not for unshared pages or remote SSE setups.