Fakecloud is a local AWS cloud emulator built for realistic integration testing: run your application with the regular AWS SDKs, CLI, and IaC tools against localhost while the emulator behaves like real infrastructure rather than a simple mock. It advertises coverage of 105 AWS services, 7,508 operations, and strict conformance (248,557/248,557 Smithy test variants passing), plus 30+ wired cross-service integrations such as S3 notifications, SNS fanout, EventBridge targets, DynamoDB Streams, Lambda triggers, and Step Functions integrations. First-party test SDKs (TypeScript, Python, Go, PHP, Java, Rust) expose a /_fakecloud/ control surface for resets, assertions, manual scheduling of async processors, and inspection of SES emails, SQS/SNS messages, Lambda invocations, and more.
Operationally it focuses on a fully local, no-auth workflow: run a single binary or Docker image with dummy credentials, fast startup (~300 ms), tiny idle memory (~10 MiB) and a small install footprint (~19 MB). It positions itself against other local emulators by removing account/tokens and paid tiers, offering behavioral testing with end-to-end conformance against official SDKs. Supported services include S3, SQS, SNS, EventBridge, Lambda, DynamoDB, RDS, Cognito, CloudWatch, KMS and many others; the project is AGPL‑3.0, maintained by faisca, and trending toward broader adoption in CI and local development.
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