Notion Proxy

An MCP server that proxies Notion's internal API using your browser cookies. This lets Claude Code (or any MCP client) read and write Notion pages where you're a guest — something the official Notion API and Notion MCP integration cannot do.

Why?

The official Notion API only works with pages in workspaces where you have an integration installed. If you're a guest on someone else's workspace, you can't:

• Use the Notion API (no integration access)
• Use the official Notion MCP plugin (requires OAuth to a workspace you don't own)

This proxy solves that by using your browser session cookies directly, giving you the same access you have in the browser.

Features

• read-page — Read page content as markdown (with block IDs for editing)
• read-comments — Read all discussions/comments with authors and timestamps
• add-comment — Create new discussions or reply to existing ones
• edit-block — Update any text block's content
• add-block — Append new blocks to a page
• delete-block — Remove blocks from a page
• add-image — Add an image (external URL or local file upload)
• create-page — Create a child page

Setup

1. Install dependencies

npm install

2. Cookie authentication

The server automatically reads cookies from your Firefox browser's cookie store. Just be logged into Notion in Firefox — no manual cookie export needed.

Cookies are cached for 60 seconds and re-read from Firefox's cookies.sqlite on each refresh, so session renewals are picked up automatically.

Fallback: If Firefox isn't available, create a .env file:

NOTION_COOKIE=<full cookie header string from browser devtools>

3. Register as a global MCP server

Add to ~/.claude.json under mcpServers:

{
  "mcpServers": {
    "notion-proxy": {
      "command": "node",
      "args": ["/path/to/notion-proxy/server.mjs"],
      "type": "stdio"
    }
  }
}

Restart Claude Code. The notion-proxy tools will be available in every project.

Usage

Once configured, ask Claude Code to interact with any Notion page by URL:

Read this page: https://www.notion.so/My-Page-abc123...

Block IDs are included in read-page output (e.g. [block:uuid]), so you can reference specific blocks for editing or commenting.

Limitations

• macOS + Firefox only for auto cookie refresh (reads ~/Library/Application Support/Firefox/Profiles/*/cookies.sqlite)
• Cookies expire when your Firefox session expires — just log in again
• Write access depends on your actual Notion permissions (guest with read-only can only read)

Platform support

Auto cookie refresh currently only works on macOS. On other platforms, use the .env fallback.

Firefox stores cookies.sqlite at different paths per OS:

OS	Path
macOS	~/Library/Application Support/Firefox/Profiles/*/cookies.sqlite
Linux	~/.mozilla/firefox/*/cookies.sqlite
Windows	%APPDATA%\Mozilla\Firefox\Profiles\*\cookies.sqlite

Adding cross-platform support is a small change to findFirefoxProfile() in server.mjs — just detect process.platform and use the appropriate path.