WinterbäumeA stateful AWS service emulator for integration testing

Test AWS-style workflows locally, embedded in Rust tests or running as a standalone server.

First-Class Rust SDK Support

Embeds as an in-process HTTP client for aws-sdk-rust. Optionally layer aws_smithy_mocks rule overrides on top for fine-grained control.

Library or Server

Embed directly in Rust tests via the aws-smithy-runtime-api HttpClient traits, or run as a standalone HTTP server for Terraform, CLI, and any AWS SDK.

Stateful

State persists across requests, isolated per account ID and region — matching real AWS isolation semantics. Build and tear down resources across multiple SDK calls.

Smithy-Backed

Per-service model.rs and wire.rs files are generated from AWS Smithy models, giving type-safe request parsing and response serialization across all implemented protocols.

63% API Coverage

7210 of 11367 operations across 224 AWS services have real, state-backed behaviour, surpassing moto's 29.0%. A further 326 operations (2.9%) are stubs that route the request and return an empty/default response — clearly broken out per service. Implemented surfaces include S3, DynamoDB, SQS, Lambda, KMS, ECS, EKS, IAM, and many more.

Pluggable Backends

Swap the default in-memory store for Redis or DuckDB. Opt-in, dependency-free from the core service crates, injected through with_backend().