WebAssembly is a way to safely run code compiled in other languages. Runtimes execute WebAssembly Modules (Wasm), which are most often binaries with a .wasm extension.

wazero is the only zero dependency WebAssembly runtime written in Go.


The best way to learn wazero is by trying one of our examples. The most basic example extends a Go application with an addition function defined in WebAssembly.

Why zero?

By avoiding CGO, wazero avoids prerequisites such as shared libraries or libc, and lets you keep features like cross compilation. Being pure Go, wazero adds only a small amount of size to your binary. Meanwhile, wazero’s API gives features you expect in Go, such as safe concurrency and context propagation.

When can I use this?

wazero is an early project, so APIs are subject to change until version 1.0. To use wazero meanwhile, you need to use the latest pre-release like this:

go get github.com/tetratelabs/wazero@latest

wazero will tag a new pre-release at least once a month until 1.0. 1.0 is scheduled for March 2023 and will require minimally Go 1.18. Except experimental packages, wazero will not break API on subsequent minor versions.

Meanwhile, please practice the current APIs to ensure they work for you, and give us a star if you are enjoying it so far!