# DynamoDB - Update Item — AWS

> Updates an existing item's attributes, or adds a new item to the table if it does not already exist. See docs

- Key: `aws-dynamodb-update-item`
- Type: Action (Write)
- Version: 0.2.3
- App: AWS (`aws`) — https://pipedream.com/apps/aws.md
- This page (HTML): https://pipedream.com/apps/aws/actions/dynamodb-update-item
- Hints: destructive · open-world
- Source: https://github.com/PipedreamHQ/pipedream/blob/master/components/aws/actions/dynamodb-update-item/dynamodb-update-item.mjs

## Description

Updates an existing item's attributes, or adds a new item to the table if it does not already exist. [See docs](https://docs.aws.amazon.com/AWSJavaScriptSDK/v3/latest/clients/client-dynamodb/classes/updateitemcommand.html)

## Props

| Prop | Type | Required | Description |
|---|---|---|---|
| `region` | `string` | Yes | The AWS region Options are loaded from the connected account. |
| `tableName` | `string` | Yes | The name of the table Options are loaded from the connected account. |
| `updateExpression` | `string` | No | An expression that defines one or more attributes to be updated, the action to be performed on them, and new values for them. Example: SET command = :echo, #execs = :oneh See the docs |
| `expressionAttributeNames` | `string` | No | One or more substitution tokens for attribute names in an expression. Example: { "#execs": "execs" } See the docs |
| `expressionAttributeValues` | `string` | No | One or more values that can be substituted in an expression. Use the : (colon) character in an expression to dereference an attribute value. Example: { ":echo": { "S": "echo" }, ":oneh": { "N": "100" } } See the docs |

## 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": "aws",
      },
    },
  },
)

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: "aws-dynamodb-update-item",
  arguments: {
    region: "AWS Region",
    tableName: "Table Name",
  },
})
```

**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: "aws-dynamodb-update-item",
  externalUserId: "{external_user_id}", // any stable ID for this user in your system
  configuredProps: {
    aws: { authProvisionId: "apn_xxxxxxx" },
    region: "AWS Region",
    tableName: "Table Name",
  },
})

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": "aws-dynamodb-update-item",
    "configured_props": {
      "aws": { "authProvisionId": "apn_xxxxxxx" },
      "region": "AWS Region",
      "tableName": "Table Name"
    }
  }'
```

---

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