# Update Child Block — Notion

> Update a single existing child block (paragraph, heading, to-do, code, etc.) by its block ID. Use this only to mutate an existing block in place. Do NOT use to update a page's properties (database row fields) — use Update Page instead. Do…

- Key: `notion-update-block`
- Type: Action (Write)
- Version: 0.0.11
- App: Notion (`notion`) — https://pipedream.com/apps/notion.md
- This page (HTML): https://pipedream.com/apps/notion/actions/update-block
- Hints: destructive · open-world
- Source: https://github.com/PipedreamHQ/pipedream/blob/master/components/notion/actions/update-block/update-block.mjs

## Description

Update a single existing **child block** (paragraph, heading, to-do, code, etc.) by its block ID. Use this only to mutate an existing block in place. Do NOT use to update a page's properties (database row fields) — use **Update Page** instead. Do NOT use to add new content to a page — use **Append Block** instead. Do NOT use to update a database's schema — use **Update Database** instead. [See the documentation](https://developers.notion.com/reference/update-a-block)

## Props

| Prop | Type | Required | Description |
|---|---|---|---|
| `blockId` | `string` | Yes | Block ID retrieved from the Retrieve Page Content action |
| `content` | `string` | Yes | The content of the block. E.g. {"code": {"rich_text":[{"type":"text","text":{"content":"Updated content"}}]}} See the documentation |

## Run it

**MCP**

```ts
import { Client } from "@modelcontextprotocol/sdk/client/index.js"
import { StreamableHTTPClientTransport } from "@modelcontextprotocol/sdk/client/streamableHttp.js"
import { PipedreamClient } from "@pipedream/sdk"

const pd = new PipedreamClient({
  projectId: process.env.PIPEDREAM_PROJECT_ID!,
  clientId: process.env.PIPEDREAM_CLIENT_ID!,
  clientSecret: process.env.PIPEDREAM_CLIENT_SECRET!,
  projectEnvironment: "production",
})

const accessToken = await pd.rawAccessToken

const transport = new StreamableHTTPClientTransport(
  new URL("https://remote.mcp.pipedream.net/v3"),
  {
    requestInit: {
      headers: {
        Authorization: `Bearer ${accessToken}`,
        "x-pd-project-id": process.env.PIPEDREAM_PROJECT_ID!,
        "x-pd-environment": "production",
        "x-pd-external-user-id": "{external_user_id}", // any stable ID for this user in your system
        "x-pd-app-slug": "notion",
      },
    },
  },
)

const mcp = new Client({ name: "my-agent", version: "1.0.0" })
await mcp.connect(transport)

const { tools } = await mcp.listTools()

// listTools() hands your model this tool's input schema, so it can
// fill the arguments itself:
const result = await mcp.callTool({
  name: "notion-update-block",
  arguments: {
    blockId: "Block ID",
    content: "Content",
  },
})
```

**TypeScript**

```ts
import { PipedreamClient } from "@pipedream/sdk"

const pd = new PipedreamClient({
  projectId: process.env.PIPEDREAM_PROJECT_ID!,
  clientId: process.env.PIPEDREAM_CLIENT_ID!,
  clientSecret: process.env.PIPEDREAM_CLIENT_SECRET!,
  projectEnvironment: "production",
})

const result = await pd.actions.run({
  id: "notion-update-block",
  externalUserId: "{external_user_id}", // any stable ID for this user in your system
  configuredProps: {
    notion: { authProvisionId: "apn_xxxxxxx" },
    blockId: "Block ID",
    content: "Content",
  },
})

console.log(result)
```

**cURL**

```bash
curl -X POST https://api.pipedream.com/v1/connect/{project_id}/actions/run \
  -H "Content-Type: application/json" \
  -H "X-PD-Environment: production" \
  -H "Authorization: Bearer {access_token}" \
  -d '{
    "external_user_id": "{external_user_id}",
    "id": "notion-update-block",
    "configured_props": {
      "notion": { "authProvisionId": "apn_xxxxxxx" },
      "blockId": "Block ID",
      "content": "Content"
    }
  }'
```

---

- App: https://pipedream.com/apps/notion.md · All apps: https://pipedream.com/apps