diff --git a/src/middleware.ts b/src/middleware.ts
new file mode 100644
index 00000000..5c0a506e
--- /dev/null
+++ b/src/middleware.ts
@@ -0,0 +1,11 @@
+import { defineMiddleware } from 'astro:middleware';
+
+// `context` and `next` are automatically typed
+export const onRequest = defineMiddleware((context, next) => {
+  let urlString = context.url.toString();
+  if (urlString.includes('#/') || urlString.includes('?id=')) {
+    urlString = urlString.replace('#/', '').replace('?id=', '/#');
+    return Response.redirect(new URL(urlString), 302);
+  }
+  return next();
+});