Most (if not all) individual example projects are standard Javascript projects commonplace ecosystem tooling, whether for server side (NodeJS, etc) or the browser.
A brief description of the examples contained in this folder:
| Example | Component Description |
|---|---|
add |
exports basic functionality with simple types with a bare function export (deprectaed) |
adder |
exports basic functionality with simple types with an interface (recommended) |
browser-p2-shims |
Interactive browser demo for WASI Preview 2 shims and per-instance customization |
builtin-bundle-ts |
Componentizes a multi-file TypeScript project with Jco's built-in bundler |
fs-write-file |
Example of using wasi:filesystem (p2) to write a file to disk |
host-logging |
Showcases the use of the wasi:logging interface with a custom embedder ("host") function |
http-hello-world |
HTTP server using the wasi:http/incoming-handler, the hard way. |
http-server-fetch-handler |
HTTP server using standards-forward fetch() event handling built into StarlingMonkey |
http-server-hono |
HTTP server using the standards-forward Hono framework |
node-fetch |
Performs a HTTP request using fetch() |
node-grpc-server |
Buf-generated gRPC server: the same source runs in Node.js and as a component using jco-std |
native-messaging |
Runs a Jco-built WASI command as a Firefox and Chromium native-messaging host |
node-mcp-server |
MCP 2026-07-28 stateless server: the same source runs in Node.js and as a component using jco-std |
p3-stream-echo-qjs |
Echoes a Preview 3 stream through a JavaScript component built with the QuickJS backend |
script-only-pipeline |
TypeScript script-only components share one engine and JSON dataset in Node.js and an uploadable browser pipeline |
node-sveltekit-server |
SvelteKit TODO app: the Node adapter output runs in Node.js and as a component using jco-std |
string-reverse-upper |
imports functionality to build more advanced computation to export |
string-reverse |
exports basic functionality with a slightly more involved WIT interface and more complex types |
typegen-async-export |
Showcases how to build that uses an async export, with types provided |
ts-resource-export |
Showcases an embedder ("host") using a resource defined in a component ("guest") |
ts-resource-import |
Showcases using a component ("guest") that imports a Resource defined by an embedder ("host") |
webidl-book-library |
Showcases WebIDL support using webidl2wit |
wintertc |
Exercises portable Web APIs provided by StarlingMonkey and verifies them as a regression test |