aws
AWS SDK integration for Node.js (v3) and Python (boto3). Core services: S3, Lambda, DynamoDB, SQS, SNS, CloudWatch, IAM. Configuration, credentials, and production patterns. USE WHEN: user mentions "AWS", "Amazon Web Services", "Lambda", "DynamoDB", "SQS", "SNS", "CloudWatch", "IAM", "boto3", "aws-sdk" DO NOT USE FOR: S3 file operations - use `cloud-storage`; SQS messaging patterns - use `sqs`; Azure/GCP - use respective skills
What this skill does
# AWS SDK Integration
## Node.js (SDK v3)
### Client Setup
```typescript
import { DynamoDBClient } from '@aws-sdk/client-dynamodb';
import { DynamoDBDocumentClient, PutCommand, GetCommand, QueryCommand } from '@aws-sdk/lib-dynamodb';
const client = new DynamoDBClient({ region: process.env.AWS_REGION });
const ddb = DynamoDBDocumentClient.from(client);
```
### DynamoDB
```typescript
// Put item
await ddb.send(new PutCommand({
TableName: 'Users',
Item: { pk: `USER#${id}`, sk: 'PROFILE', name, email, createdAt: Date.now() },
ConditionExpression: 'attribute_not_exists(pk)', // Prevent overwrite
}));
// Get item
const { Item } = await ddb.send(new GetCommand({
TableName: 'Users', Key: { pk: `USER#${id}`, sk: 'PROFILE' },
}));
// Query
const { Items } = await ddb.send(new QueryCommand({
TableName: 'Orders',
KeyConditionExpression: 'pk = :pk AND begins_with(sk, :prefix)',
ExpressionAttributeValues: { ':pk': `USER#${userId}`, ':prefix': 'ORDER#' },
}));
```
### Lambda Invocation
```typescript
import { LambdaClient, InvokeCommand } from '@aws-sdk/client-lambda';
const lambda = new LambdaClient({});
const { Payload } = await lambda.send(new InvokeCommand({
FunctionName: 'processOrder',
InvocationType: 'Event', // async ('RequestResponse' for sync)
Payload: JSON.stringify({ orderId }),
}));
```
### SNS
```typescript
import { SNSClient, PublishCommand } from '@aws-sdk/client-sns';
const sns = new SNSClient({});
await sns.send(new PublishCommand({
TopicArn: process.env.ORDER_TOPIC_ARN,
Message: JSON.stringify({ orderId, status: 'completed' }),
MessageAttributes: {
eventType: { DataType: 'String', StringValue: 'ORDER_COMPLETED' },
},
}));
```
### CloudWatch Metrics
```typescript
import { CloudWatchClient, PutMetricDataCommand } from '@aws-sdk/client-cloudwatch';
const cw = new CloudWatchClient({});
await cw.send(new PutMetricDataCommand({
Namespace: 'MyApp',
MetricData: [{
MetricName: 'OrderProcessingTime',
Value: durationMs,
Unit: 'Milliseconds',
Dimensions: [{ Name: 'Service', Value: 'OrderProcessor' }],
}],
}));
```
## Python (boto3)
```python
import boto3
# DynamoDB
dynamodb = boto3.resource('dynamodb')
table = dynamodb.Table('Users')
table.put_item(Item={'pk': f'USER#{id}', 'sk': 'PROFILE', 'name': name})
response = table.get_item(Key={'pk': f'USER#{id}', 'sk': 'PROFILE'})
# Lambda
lambda_client = boto3.client('lambda')
lambda_client.invoke(FunctionName='processOrder',
InvocationType='Event', Payload=json.dumps({'orderId': order_id}))
# SNS
sns = boto3.client('sns')
sns.publish(TopicArn=topic_arn, Message=json.dumps(payload))
```
## Credentials (never hardcode)
| Environment | Method |
|-------------|--------|
| Local dev | `~/.aws/credentials` or `AWS_PROFILE` |
| EC2/ECS | Instance/task IAM role (automatic) |
| Lambda | Execution role (automatic) |
| CI/CD | `AWS_ACCESS_KEY_ID` + `AWS_SECRET_ACCESS_KEY` env vars |
## Anti-Patterns
| Anti-Pattern | Fix |
|--------------|-----|
| Hardcoded credentials | Use IAM roles, env vars, or credential chain |
| Single-region architecture | Use multi-AZ, consider multi-region for DR |
| No retries on SDK calls | SDK v3 retries automatically — configure `maxAttempts` |
| Scan instead of Query (DynamoDB) | Design keys for Query access patterns |
| Synchronous Lambda calls in request path | Use async invocation or SQS |
## Production Checklist
- [ ] IAM roles with least privilege
- [ ] No hardcoded credentials
- [ ] SDK retry configuration (`maxAttempts`)
- [ ] CloudWatch alarms on error metrics
- [ ] VPC endpoints for S3/DynamoDB (saves NAT costs)
- [ ] Resource tagging for cost allocation
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