Maybe URLs like this? I think this'll need some reworking but it's a start.

commands/app.js

@@ -18,6 +18,7 @@ let CONFIGURED = false;
 nunjucks.configure("templates", { watch: true });
 
 const configure = async (fastify, opts) => {
+  const app = fastify(opts);
 
   // MAGIC: this is how you trick the importer to reload modules
   // that have changed. Since it uses a URL you can add a query
@@ -25,23 +26,23 @@ const configure = async (fastify, opts) => {
   // tags the module as being "new" when it's still the same file
   // TODO: maybe use fs timestamps instead?
   // BUG: sometimes reload is too fast for vim and crashes
-  const controller = await import(`../controllers/todo.js?update=${new Date()}`);
+  const control_mod = await import(`../controllers/todo.js?update=${new Date()}`);
-
-  const handler = new controller.Todo();
-  const app = fastify(opts);
 
   // this is a sample that uses the handler we dynamic load
   // to handle the /todo but not sure how to work the actual
   // URL mappings for it.  Also not sure about using classes
-  app.get("/todo", async (req, rep) => {
+  for(let [url, controller] of Object.entries(control_mod.default)) {
-    try {
+    const handler = new controller();
-      await handler.get(req, rep);
+    app.get(`/${url}`, async (req, rep) => {
-    } catch(error) {
+      try {
-      console.error(error);
+        await handler.get(req, rep);
-      console.error(error.stack);
+      } catch(error) {
-      console.error(error.source);
+        console.error(error);
-    }
+        console.error(error.stack);
-  });
+        console.error(error.source);
+      }
+    });
+  }
 
   app.register(FastifyStatic, {
     root: path.join(path.resolve("."), 'static'),

controllers/todo.js

@@ -14,3 +14,7 @@ export class Todo {
     rep.code(200).type("text/html").send(result);
   }
 }
+
+// you use the export default to set the route URL?
+// I mean, it works not sure if I like it though
+export default { todo: Todo };