aws/aws-emulator
Emulates AWS APIs locally so your SDK calls hit a fake AWS instead of the real one.
AWS Emulator serves a local AWS API endpoint so existing AWS CLI or SDK code runs against emulated resources, no AWS account, and no charge beyond whatever real AWS resources get deployed separately. It supports a server mode, install a package or run a Docker container, then point an SDK at it via environment variables, and an embedded Rust mode that compiles the emulator into a test binary for one isolated instance per test. It publishes per-service fidelity scores with every release and tracks exactly which APIs don't work yet in the repo's issues directory, and says plainly it's for building and testing, not production or security testing.
What holds up
- +No AWS account or service fee — you only pay for real AWS resources when you actually deploy.
- +Publishes a fidelity score per AWS service with every release, instead of claiming full compatibility.
- +Tracks exactly which APIs don't work yet in issues/things-that-do-not-work/, so gaps aren't hidden.
- +Embedded Rust mode runs one isolated emulator instance per test, in-process, with no endpoint or cert to set.
Mind the limits
- −Building from source needs 100GB+ of free disk for target/, since it's one crate per AWS service.
- −States outright it's not for production workloads or security testing.
- −Windows and macOS only get it via Docker — native builds are Linux x86_64/aarch64 only.
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