Services Overview

Tarn emulates the following AWS services for local development and testing.

Supported Services

Service	Status	Details
Lambda	Partial	Core Lambda APIs, layers, and SQS/DynamoDB Streams event source mappings
API Gateway v2	Partial	HTTP APIs with Lambda and SQS integrations
API Gateway v1	Partial	REST APIs with Lambda proxy and SQS integrations
S3	Partial	Path-style operations, multipart upload, Lambda notifications
SQS	Full	Queues, event source mappings, DLQ
SNS	Full	Topics, subscriptions, fanout to SQS/Lambda
DynamoDB	Partial	Core table APIs, Query/Scan, secondary indexes, Streams
Secrets Manager	Full	CRUD, tagging, compatibility policy reads, Lambda extension
EventBridge	Partial	Scheduled rules, event-pattern rules, and PutEvents with Lambda targets

Service Guides

Each service has detailed documentation with:

• Supported Operations — Exactly what's implemented
• Operation Table — Which API calls work
• Code Examples — AWS SDK usage
• Known Limitations — What's not yet supported
• See Also — Related resources

Pick a service below to get started:

Lambda

Deploy and invoke functions. Containers, layers, event mappings.

Partial Support

API Gateway

HTTP and REST APIs. Lambda and SQS integrations, routes, stages.

Partial Support

S3

Object storage. CRUD, multipart upload, Lambda notifications.

Partial Support

SQS

Message queues. Event source mappings to Lambda.

Fully Supported

SNS

Pub/sub messaging. Fanout to SQS and Lambda.

Fully Supported

DynamoDB

Tables, indexes, item CRUD, Query/Scan, and Streams.

Partial Support

Secrets Manager

Secrets storage. Tagging, compatibility policy reads, Lambda extension.

Fully Supported

EventBridge

Scheduled rules and custom events. Rate/cron, event patterns, and Lambda targets.

Partial Support