WinterCG Worker (JavaScript) + Wasmer

This example shows how to run a WinterCG-compatible worker—powered by WinterJS—on Wasmer Edge.

Full tutorial: https://docs.wasmer.io/edge/quickstart/js-wintercg

Demo

https://wasmer-js-worker-starter.wasmer.app/

How it Works

src/index.js exports a single fetch event handler:

• handler(request) serialises the worker’s environment (process.env) into JSON.
• addEventListener("fetch", ...) registers the handler so every request returns the JSON payload.

Because WinterJS implements the WinterCG APIs, the same worker can run on Wasmer Edge or other compatible hosts.

Running Locally

wasmer run .

The Wasmer CLI bundles and serves the worker on http://127.0.0.1:8080/. Modify src/index.js, rerun the command, and refresh to test changes.

Deploying to Wasmer (Overview)

1. Ensure your project exports a fetch handler from src/index.js (or another entrypoint defined in wasmer.toml).
2. Deploy with wasmer deploy or via the Wasmer dashboard.
3. Hit https://<your-subdomain>.wasmer.app/ to inspect the response.