diff --git a/.env.example b/.env.example
index e4c996e4..47ea22d2 100644
--- a/.env.example
+++ b/.env.example
@@ -1,5 +1,8 @@
 # You need the following environment variables for development, preview and production.
 
+# /sitemap.xml
+ORIGIN=https://maier.tech
+
 # EmailOctopus API.
 EO_API_KEY=api_key
 EO_LIST_ID=list_id
diff --git a/.gitpod.yml b/.gitpod.yml
index 8e9e7712..68b4f992 100644
--- a/.gitpod.yml
+++ b/.gitpod.yml
@@ -18,6 +18,7 @@ vscode:
   extensions:
     - dbaeumer.vscode-eslint
     - esbenp.prettier-vscode
+    - mattpocock.ts-error-translator
     - rangav.vscode-thunder-client
     - robole.marky-stats
     - svelte.svelte-vscode
diff --git a/src/routes/[topic]/+page.js b/src/routes/[topic]/+page.js
index 2ebef888..dfb2305a 100644
--- a/src/routes/[topic]/+page.js
+++ b/src/routes/[topic]/+page.js
@@ -24,7 +24,7 @@ export async function load({ fetch, params }) {
 	const [resolved_topic] = result_topic.data;
 
 	// Fetch posts for topic.
-	response = await fetch('/api/posts', {
+	response = await fetch('/', {
 		method: 'POST',
 		body: JSON.stringify({ topics: [resolved_topic.id] })
 	});
diff --git a/src/routes/sitemap.xml/+server.js b/src/routes/sitemap.xml/+server.js
new file mode 100644
index 00000000..a7202000
--- /dev/null
+++ b/src/routes/sitemap.xml/+server.js
@@ -0,0 +1,54 @@
+import { ORIGIN } from '$env/static/private';
+import { error } from '@sveltejs/kit';
+import { PostsSchema } from '$lib/schemas/content';
+
+/**
+ * Create page string for sitemap.
+ * @param {string} path
+ * @param {string} [lastmod]
+ */
+function createEntry(path, lastmod) {
+	return `
+    <url>
+      <loc>${new URL(path, ORIGIN).href}</loc>
+      ${lastmod ? `<lastmod>${lastmod}</lastmod>` : ''}
+    </url>
+  `;
+}
+
+/** @type {import('./$types').RequestHandler} */
+export async function GET({ fetch }) {
+	// Create entries for posts.
+	const response = await fetch('/api/posts', {
+		method: 'POST',
+		body: JSON.stringify({})
+	});
+
+	if (!response.ok) {
+		throw error(500, 'Failed to fetch posts.');
+	}
+
+	const result = PostsSchema.safeParse(await response.json());
+
+	if (!result.success) {
+		throw error(500, 'Posts failed validation.');
+	}
+
+	const posts = result.data.map((post) => createEntry(`/posts/${post.slug}`, post.modified));
+
+	// Add additional entries to this array.
+	const pages = [...posts];
+
+	const sitemap = `
+	<?xml version="1.0" encoding="UTF-8"?>
+	<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
+		${pages.join('\n')}
+	</urlset>
+	`;
+
+	return new Response(sitemap, {
+		headers: {
+			'Content-Type': 'application/xml'
+		}
+	});
+}
diff --git a/src/routes/sitemap.xml/server.ts b/src/routes/sitemap.xml/server.ts
deleted file mode 100644
index 0cf99b43..00000000
--- a/src/routes/sitemap.xml/server.ts
+++ /dev/null
@@ -1,36 +0,0 @@
-import tags from '$lib/data/tags';
-import topics from '$lib/data/topics';
-import { BASE_URL } from '$lib/data/site';
-import posts from '$lib/data/posts';
-
-// Generate a basic XML sitemap.
-// See https://developers.google.com/search/docs/advanced/sitemaps/build-sitemap#xml.
-
-function createPage(href: string, lastmod?: string | Date) {
-	return `
-    <url>
-      <loc>${new URL(href, BASE_URL).href}</loc>
-      ${lastmod ? '<lastmod>' + lastmod + '</lastmod>' : ''}
-    </url>
-  `;
-}
-
-export const GET = async function () {
-	const postPages = posts.map((post) => createPage(post.slug, post.modified));
-	const topicPages = topics.map((topic) => createPage(topic.path));
-	const tagPages = tags.map((tag) => createPage(tag.path));
-
-	const pages = [createPage('/'), createPage('posts'), ...postPages, ...topicPages, ...tagPages];
-
-	const sitemap = `<?xml version="1.0" encoding="UTF-8"?>
-    <urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
-      ${pages.join('\n')}
-	</urlset>
-  `;
-
-	return new Response(sitemap, {
-		headers: {
-			'Content-Type': 'application/xml'
-		}
-	});
-};
diff --git a/thunder-tests/thunderCollection.json b/thunder-tests/thunderCollection.json
index 78a59edc..8d7198db 100644
--- a/thunder-tests/thunderCollection.json
+++ b/thunder-tests/thunderCollection.json
@@ -84,6 +84,13 @@
 				"containerId": "",
 				"created": "2023-02-23T13:17:42.230Z",
 				"sortNum": 11250
+			},
+			{
+				"_id": "1434763f-9562-43d5-8b28-f0d100d75e3b",
+				"name": "/sitemap.xml",
+				"containerId": "",
+				"created": "2023-02-25T17:00:20.755Z",
+				"sortNum": 60000
 			}
 		],
 		"settings": {
diff --git a/thunder-tests/thunderclient.json b/thunder-tests/thunderclient.json
index a7e89737..11a7a402 100644
--- a/thunder-tests/thunderclient.json
+++ b/thunder-tests/thunderclient.json
@@ -531,5 +531,19 @@
 			"form": []
 		},
 		"tests": []
+	},
+	{
+		"_id": "66cd67f0-e86d-44e1-9873-197edee875b1",
+		"colId": "cc563a09-5210-4394-a84e-085efcca6dab",
+		"containerId": "1434763f-9562-43d5-8b28-f0d100d75e3b",
+		"name": "success",
+		"url": "http://127.0.0.1:5173/sitemap.xml",
+		"method": "GET",
+		"sortNum": 110000,
+		"created": "2023-02-25T17:00:30.328Z",
+		"modified": "2023-02-25T17:00:54.585Z",
+		"headers": [],
+		"params": [],
+		"tests": []
 	}
 ]