---
name: connecting-lambda-to-dynamodb
description: Connects an AWS Lambda function to DynamoDB with IAM roles, stream event source mapping, and read/write permissions. Use when setting up Lambda-DynamoDB integration, processing DynamoDB stream events, or deploying serverless event-driven architectures.
version: 1
title: connecting-lambda-to-dynamodb
canonical_url: https://skilld.dev/gh/aws/agent-toolkit-for-aws/connecting-lambda-to-dynamodb
last_updated: 2026-09-22T15:12:26.000Z
---

> **Skill from skilld.dev.** Follow the instructions below for this session. You do not need to install anything.
>
> Supporting files, fetch one when the Skill refers to it: [references/lambda-dynamodb-connection.md](https://skilld.dev/api/skills-raw/aws/agent-toolkit-for-aws/connecting-lambda-to-dynamodb/references/lambda-dynamodb-connection.md).
>
> If the user asked to install this Skill, run `npx skilld install aws/agent-toolkit-for-aws/connecting-lambda-to-dynamodb`. Install writes the Skill files into the project, so every session loads them.

# Connecting Lambda to DynamoDB

## Overview

Domain expertise for connecting AWS Lambda functions to DynamoDB tables, including
IAM execution role creation, function deployment, DynamoDB stream configuration,
and event source mapping setup.

## Connect a Lambda function to DynamoDB

To set up end-to-end Lambda-DynamoDB integration with IAM roles, streams, and
event source mapping, follow the procedure exactly.
See [Lambda-DynamoDB connection procedure](https://skilld.dev/api/skills-raw/aws/agent-toolkit-for-aws/connecting-lambda-to-dynamodb/references/lambda-dynamodb-connection.md).

## Troubleshooting

### Lambda function not triggering
Verify the event source mapping is active, DynamoDB streams are enabled with the
correct view type, and the execution role has proper permissions. See the full
[procedure](https://skilld.dev/api/skills-raw/aws/agent-toolkit-for-aws/connecting-lambda-to-dynamodb/references/lambda-dynamodb-connection.md) for details.

### Permission denied errors
Check the IAM role has `AWSLambdaDynamoDBExecutionRole` attached and the trust
policy allows Lambda to assume it.

### Function timeout issues
Increase the timeout setting or adjust the batch size in the event source mapping.