Hello World
The simplest possible worker.
Basic Response
export default {
async fetch(request: Request): Promise<Response> {
return new Response('Hello, World!');
}
};With HTML
export default {
async fetch(request: Request): Promise<Response> {
const html = `<!DOCTYPE html>
<html>
<head><title>Hello</title></head>
<body><h1>Hello, World!</h1></body>
</html>`;
return new Response(html, {
headers: { 'Content-Type': 'text/html' }
});
}
};With Routing
export default {
async fetch(request: Request): Promise<Response> {
const { pathname } = new URL(request.url);
if (pathname === '/') {
return new Response('Home');
}
if (pathname === '/about') {
return new Response('About');
}
return new Response('Not Found', { status: 404 });
}
};With Request Info
export default {
async fetch(request: Request): Promise<Response> {
const { pathname, searchParams } = new URL(request.url);
const name = searchParams.get('name') || 'World';
return Response.json({
message: `Hello, ${name}!`,
method: request.method,
path: pathname,
headers: Object.fromEntries(request.headers)
});
}
};Test with:
curl "https://your-worker.openworkers.com/?name=Alice"