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Container2Wasm

Container2Wasm is a tool that converts OCI/Docker container images into WebAssembly System Interface (WASI) modules for execution in WebAssembly runtimes (application portability / runtime abstraction).

  • Conversion of OCI/Docker container images into WASI-compliant WebAssembly modules (application packaging / runtime abstraction).
  • Preservation of container filesystem contents inside a generated WASM module (application packaging).
  • Support for running containerized applications under WASI-compatible WebAssembly runtimes (application runtime).
  • Command-line tooling for building and exporting WASM modules from existing container images (developer tooling).
  • Facilitation of moving workloads from container-based infrastructure to WebAssembly-based environments (platform migration / workload portability).

More About Container2Wasm

Container2Wasm targets the problem of running existing containerized workloads in WebAssembly runtimes by providing a conversion path from OCI or Docker images to WebAssembly System Interface (WASI) modules (application portability / runtime abstraction). Many organizations have workloads packaged as containers, and WebAssembly runtimes expose WASI as a common interface instead of full Linux containers. Container2Wasm focuses on bridging this packaging gap so that users can reuse existing images without rebuilding applications from scratch for WebAssembly.

The project provides tooling that takes a container image, reads its filesystem and metadata, and produces a WebAssembly module with a WASI-compatible entrypoint (application packaging). The generated module embeds the container filesystem, enabling the application to access its files inside the WASM environment much as it would inside a container. This positions Container2Wasm in the category of workload conversion utilities between container ecosystems and WebAssembly runtimes.

From an enterprise perspective, Container2Wasm can be used where teams want to experiment with or adopt WebAssembly runtimes while retaining existing container image build pipelines (platform engineering / runtime experimentation). Continuous Integration (CI) and delivery systems that produce OCI images can feed those images into Container2Wasm to create WASI modules that then run under chosen WebAssembly runtimes, subject to WASI constraints. This aligns with environments that are exploring alternative execution sandboxes for microservices, batch jobs, or utilities.

Technically, Container2Wasm is centered on the WebAssembly System Interface (WASI) (application runtime interface) and on standard container image formats such as OCI and Docker (container packaging). It sits alongside container registries and WebAssembly registries, helping users traverse from one format to another. Its command-line tooling can be integrated into build scripts or developer workflows to generate WASM modules as an additional artifact type, without changing existing Dockerfiles or base images.

In terms of interoperability, Container2Wasm engages two ecosystems: the container ecosystem defined around OCI/Docker, and WebAssembly runtimes that implement WASI (ecosystem bridging). Enterprises can position Container2Wasm in their toolchain as a specialized converter that enables limited reuse of containerized applications in WASI-based environments, depending on runtime and Application Programming Interface (API) compatibility. Within a technical directory, Container2Wasm fits under workload conversion, application packaging, and runtime abstraction for WebAssembly.