WASM - Simplest Thing That Works (STTWs)

Apr 1, 2026 - 1 min read - 100 words

Brett Dargan

Tech Co-Founder | Architect | Strategist

2026W14-3

Simplest zig wasm

export fn add(a: i32, b: i32) i32 {
    return a + b;
}

zig build-exe add.zig -target wasm32-freestanding -fno-entry -rdynamic

<!doctype html>
<html>
  <body>
    <script>
      const request = new XMLHttpRequest()
      request.open('GET', 'add.wasm')
      request.responseType = 'arraybuffer'
      request.send()
      request.onload = function () {
        WebAssembly.instantiate(request.response, { env: {} }).then((result) => {
          const add = result.instance.exports.add
          console.log(add(3, 5)) // Outputs 8
        })
      }
    </script>
  </body>
</html>

run

python -m http.server

Open and check console