diff --git a/demo_ssr/package-lock.json b/demo_ssr/package-lock.json
new file mode 100644
index 0000000000000000000000000000000000000000..82720637058755bedb68720e78e424d197c95fbb
--- /dev/null
+++ b/demo_ssr/package-lock.json
@@ -0,0 +1,945 @@
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+ "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
+ "integrity": "sha512-BNGbWLfd0eUPabhkXUVm0j8uuvREyTh5ovRa/dyow/BqAbZJyC+5fU+IzQOzmAKzYqYRAISoRhdQr3eIZ/PXqg==",
+ "license": "MIT",
+ "engines": {
+ "node": ">= 0.8"
+ }
+ }
+ }
+}
diff --git a/demo_ssr/package.json b/demo_ssr/package.json
new file mode 100644
index 0000000000000000000000000000000000000000..5e992a4c6e1dce67f7bead4d17b5adee81006b97
--- /dev/null
+++ b/demo_ssr/package.json
@@ -0,0 +1,10 @@
+{
+ "scripts": {
+ "start": "cd src; node server.js"
+ },
+ "dependencies": {
+ "ejs": "^3.1.10",
+ "express": "^4.19.2",
+ "uuid": "^10.0.0"
+ }
+}
diff --git a/demo_ssr/src/public/style.css b/demo_ssr/src/public/style.css
new file mode 100644
index 0000000000000000000000000000000000000000..3d65a696ffed7340b5c1baf9937dbd2355752149
--- /dev/null
+++ b/demo_ssr/src/public/style.css
@@ -0,0 +1,17 @@
+body {
+ background: pink;
+ margin: 2rem;
+}
+
+#submit {
+ display: block;
+}
+
+#content {
+ width: 100%;
+ height: 128px;
+}
+
+.post {
+ margin: 1rem 0;
+}
diff --git a/demo_ssr/src/server.js b/demo_ssr/src/server.js
new file mode 100644
index 0000000000000000000000000000000000000000..b91e41598d5f5962e6cd32557df7a60fce430c7b
--- /dev/null
+++ b/demo_ssr/src/server.js
@@ -0,0 +1,47 @@
+let express = require("express");
+let ejs = require("ejs");
+// generates globally unique ids, we use for post ids
+let uuid = require("uuid");
+
+let hostname = "localhost";
+let port = 3000;
+
+let app = express();
+
+app.set("view engine", "ejs");
+app.use(express.static("public"));
+app.use(express.json());
+
+let posts = {};
+
+// res.render takes name of EJS template file in views/ (without extension)
+// and optional object that will be passed to template
+// e.g. res.render("abc", { xyz: 123 })
+// will render views/abc.ejs
+// which will have access to the variable xyz with value 123
+
+app.post("/post", (req, res) => {
+ let { title, content } = req.body; // TODO validate
+ let postId = uuid.v4();
+ posts[postId] = { title, content };
+ return res.json({ postId });
+ // could also do a res.redirect and redirect them to the new post page
+ // but then the client should use a <form> and <input type="submit">, not ajax
+});
+
+app.get("/post/:postId", (req, res) => {
+ let { postId } = req.params;
+ if (!posts.hasOwnProperty(postId)) {
+ return res.status(404).send("Post not found");
+ }
+ let { title, content } = posts[postId];
+ return res.render("post", { title, content });
+});
+
+app.get("/", (req, res) => {
+ return res.render("index", { posts });
+});
+
+app.listen(port, hostname, () => {
+ console.log(`http://${hostname}:${port}`);
+});
diff --git a/demo_ssr/src/views/index.ejs b/demo_ssr/src/views/index.ejs
new file mode 100644
index 0000000000000000000000000000000000000000..863eb14ecf03542eb0dc6cfaf1ab696436778c57
--- /dev/null
+++ b/demo_ssr/src/views/index.ejs
@@ -0,0 +1,50 @@
+<!DOCTYPE html>
+<html>
+<head>
+ <meta charset="utf-8">
+ <meta name="viewport" content="width=device-width, initial-scale=1">
+ <title>Posts</title>
+ <link rel="stylesheet" href="/style.css">
+</head>
+<body>
+
+<h1>Posts</h1>
+
+<div id="form">
+ <div>
+ <label for="title">Title:</label>
+ <input type="text" id="title" name="title">
+ </div>
+ <textarea id="content">Write your post here...</textarea>
+ <button id="submit">Make post</button>
+</div>
+
+<% for ([postId, { title }] of Object.entries(posts)) { %>
+ <div class="post"><a href="/post/<%= postId %>"><%= title %></a></div>
+<% } %>
+
+<script>
+let titleElement = document.getElementById("title");
+let contentElement = document.getElementById("content");
+let submit = document.getElementById("submit");
+
+submit.addEventListener("click", async () => {
+ let title = titleElement.value;
+ let content = contentElement.value;
+ let response = await fetch("/post", {
+ method: "POST",
+ headers: {
+ "Content-Type": "application/json"
+ },
+ body: JSON.stringify({title, content})
+ });
+ // TODO check for errors if didn't validate
+ let { postId } = await response.json();
+ console.log(postId);
+ // redirect to new post
+ window.location = `/post/${postId}`;
+});
+</script>
+
+</body>
+</html>
diff --git a/demo_ssr/src/views/post.ejs b/demo_ssr/src/views/post.ejs
new file mode 100644
index 0000000000000000000000000000000000000000..c7b215305aa8381f4a8e1f730eb9d8fe00bfce22
--- /dev/null
+++ b/demo_ssr/src/views/post.ejs
@@ -0,0 +1,18 @@
+<!DOCTYPE html>
+<html>
+<head>
+ <meta charset="utf-8">
+ <meta name="viewport" content="width=device-width, initial-scale=1">
+ <title>Post — <%= title %></title>
+ <link rel="stylesheet" href="/style.css">
+</head>
+<body>
+
+<h1><%= title %></h1>
+
+<p><%= content %></p>
+
+<p><a href="/">Back to home</a></p>
+
+</body>
+</html>