create blog posts from markdown files

routes/blog/[slug].json.js

@@ -1,21 +1,23 @@
-import posts from './_posts.js';
+import { getPost } from './_posts.js';
 
 const lookup = new Map();
-posts.forEach(post => {
-	lookup.set(post.slug, JSON.stringify(post));
-});
 
 export function get(req, res, next) {
-	// the `slug` parameter is available because
-	// this file is called [slug].json.js
 	const { slug } = req.params;
 
-	if (lookup.has(slug)) {
+	if (process.env.NODE_ENV !== 'production' || !lookup.has(slug)) {
+		const post = getPost(slug);
+		lookup.set(slug, JSON.stringify(post));
+	}
+
+	const json = lookup.get(slug);
+
+	if (json) {
 		res.writeHead(200, {
 			'Content-Type': 'application/json'
 		});
 
-		res.end(lookup.get(slug));
+		res.end(json);
 	} else {
 		res.writeHead(404, {
 			'Content-Type': 'application/json'