Restructure app for scale and easy access of routeId

src/routes/api/_lessons.js

@@ -0,0 +1,14 @@
+const lessons = [{}];
+
+const lookup = new Map();
+lessons.forEach((lesson) => {
+  lookup.set(`${lesson.id}`, JSON.stringify(lesson));
+});
+
+export function getLessons() {
+  return lessons;
+}
+
+export function getLecture(id) {
+  return lookup.get(id);
+}

src/routes/api/lesson.js

@@ -0,0 +1,27 @@
+import { getLecture } from './_lessons';
+
+function writeJsonHead(res, statusCode) {
+  res.writeHead(statusCode, {
+    'Content-Type': 'application/json',
+  });
+}
+
+export function get(req, res, next) {
+  // the `id` parameter is available because
+  // this file is called [id].json.js
+  const { id } = req.params;
+
+  if (lookup.has(id)) {
+    writeJsonHead(res, 200);
+
+    res.end(lookup.get(id));
+  } else {
+    writeJsonHead(res, 404);
+
+    res.end(
+      JSON.stringify({
+        message: `Not found`,
+      })
+    );
+  }
+}