diff --git a/README.md b/README.md
index 28a6056..3a38e93 100644
--- a/README.md
+++ b/README.md
@@ -9,7 +9,7 @@ Edit di Cursor di Mac, commit, lalu `git push`. Deploy ke `ubuntu-vm` terpisah (
 | Folder | Pelajaran | Port di VM |
 |--------|-----------|------------|
 | `pelajaran-1/` | Nginx + HTML statis | `8088` |
-| `pelajaran-2/` | Node.js di Docker | `8091` |
+| `pelajaran-2/` | Node.js di Docker — lihat `pelajaran-2/PELAJARAN-2.md` | `8091` |
 
 ## Git remote
 
diff --git a/pelajaran-2/server.js b/pelajaran-2/server.js
index 9499c5c..0d05a22 100644
--- a/pelajaran-2/server.js
+++ b/pelajaran-2/server.js
@@ -1,13 +1,112 @@
 const http = require('http');
 
+
+const notes = [];
+
 // fungsi ini dipanggil ketika ada request
 function handleRequest(request, response) {
     console.log('Ada yang minta:', request.url);
     
     const waktu = new Date().toISOString("id-ID");
 
+    // --- CABANG API ---
+    if (request.url === '/api/hello') {
+        response.writeHead(200, {
+            'Content-Type': 'application/json; charset=utf-8'
+        })
+        response.end(
+            JSON.stringify({
+                message: 'Halo dari API Node',
+                waktu: waktu,
+            })
+        )
+        return; // penting: berhenti disini, jangan kirim HTML juga.
+    }
+
+    if (request.url === '/api/greet' && request.method === 'POST') {
+        let body = '';
+
+        request.on('data', function(chunk) {
+            body += chunk;
+        })
+
+        request.on('end', function() {
+            let name = 'teman';
+            try {
+                const parsed = JSON.parse(body);
+                if (parsed.name) {
+                    name = String(parsed.name)
+                }
+            } catch (err) {
+                console.error('Gagal membaca body:', err);
+            }
+
+            response.writeHead(200, {
+                'Content-Type': 'application/json; charset=utf-8'
+            })
+            response.end(
+                JSON.stringify({
+                    sapaan: `Halo, ${name}!`,
+                    waktu: new Date().toISOString(),
+                })
+            )
+        })
+        return;
+    }
+
+    if (request.url === '/api/notes' && request.method === 'GET') {
+        response.writeHead(200, {
+            'Content-Type': 'application/json; charset=utf-8',
+        })
+        response.end(JSON.stringify(notes));
+        return;
+    }
+
+    if (request.url === '/api/notes' && request.method === 'POST') {
+        let body = '';
+
+        request.on('data', function(chunk) {
+            body += chunk;
+        })
+        request.on('end', function() {
+            let teks = '';
+            try {
+                const parsed = JSON.parse(body);
+                if (parsed.teks) {
+                    teks = String(parsed.teks).trim();
+                }
+            } catch (err) {
+                console.error('Gagal membaca body:', err);
+            }
+
+            if (!teks) {
+                response.writeHead(400, {
+                    'Content-Type': 'application/json; charset=utf-8',
+                })
+                response.end(JSON.stringify({
+                    error: 'Teks tidak boleh kosong',
+                }))
+                return;
+            }
+
+            const note = {
+                id: Date.now(),
+                teks: teks,
+                waktu: new Date().toISOString(),
+            }
+            notes.push(note);
+
+            response.writeHead(201, {
+                'Content-Type': 'application/json; charset=utf-8',
+            })
+            response.end(JSON.stringify(note));
+            return;
+        })
+        return;
+    }
+    // --- CABANG HTML ---
     response.writeHead(200, {
-        "Content-Type": "text/html; charset=utf-8",
+        'Content-Type': 'text/html; charset=utf-8'
     });
 
     response.end(`<!DOCTYPE html>
@@ -18,13 +117,95 @@ function handleRequest(request, response) {
   </head>
   <body>
     <h1>Halo dari Node</h1>
-    <p>Ini dibuat ulang setiap request, bukan file HTML diam.</p>
-    <p>Waktu server: <strong>${waktu}</strong></p>
-    <p>Path yang diminta: <code>${request.url}</code></p>
+    <p>Halaman ini dari server. Tombol di bawah memanggil API dari browser.</p>
+    <p>Waktu saat halaman dibuat: <strong>${waktu}</strong></p>
+    <button type="button" id="tombol">Panggil /api/hello</button>
+    <p id="hasil">Belum dipanggil.</p>
+    <hr />
+    <h2>Coba POST</h2>
+    <label>
+        Nama: <br />
+    <input type="text" id="nama" placeholder="namamu" /><br />
+    </label>
+        <button type="button" id="kirim">Kirim ke /api/greet</button>
+    <p id="sapaan">Belum ada sapaan.</p>
+    <hr />
+    <h2>Caatan (memori server)</h2>
+    <ul id='daftar-notes'></ul>
+    <input type='text' id='teks-note' placeholder='Tulis catatan baru...' />
+    <button type='button' id='tambah-note'>Tambah</button>
+    <script>
+      const tombol = document.getElementById("tombol");
+      const hasil = document.getElementById("hasil");
+      tombol.addEventListener("click", async function () {
+        hasil.textContent = "Memuat...";
+        try {
+          const response = await fetch("/api/hello");
+          const data = await response.json();
+          hasil.textContent = data.message + " | " + data.waktu;
+        } catch (err) {
+          hasil.textContent = "Gagal: " + err.message;
+        }
+      });
+
+        const inputNama = document.getElementById("nama");
+        const tombolKirim = document.getElementById("kirim");
+        const teksSapaan = document.getElementById("sapaan");
+        tombolKirim.addEventListener("click", async function () {
+            teksSapaan.textContent = "Mengirim...";
+            try {
+            const response = await fetch("/api/greet", {
+                method: "POST",
+                headers: {
+                "Content-Type": "application/json",
+                },
+                body: JSON.stringify({
+                nama: inputNama.value,
+                }),
+            });
+            const data = await response.json();
+            teksSapaan.textContent = data.sapaan + " (" + data.waktu + ")";
+            } catch (err) {
+            teksSapaan.textContent = "Gagal: " + err.message;
+            }
+        });
+
+        const daftarNotes = document.getElementById("daftar-notes");
+        const inputNote = document.getElementById("teks-note");
+        const tombolNote = document.getElementById("tambah-note");
+
+        async function muatNotes() {
+        const response = await fetch("/api/notes");
+        const data = await response.json();
+        daftarNotes.innerHTML = "";
+        data.forEach(function (note) {
+            const li = document.createElement("li");
+            li.textContent = note.teks + " (" + note.waktu + ")";
+            daftarNotes.appendChild(li);
+        });
+        }
+
+        tombolNote.addEventListener("click", async function () {
+        await fetch("/api/notes", {
+            method: "POST",
+            headers: { "Content-Type": "application/json" },
+            body: JSON.stringify({ teks: inputNote.value }),
+        });
+        inputNote.value = "";
+        await muatNotes();
+        });
+
+        // saat halaman dibuka, ambil daftar yang sudah ada
+        muatNotes();
+    </script>
   </body>
 </html>`);
+
+    
 }
 
+
+// --- Mulai server ---
 const server = http.createServer(handleRequest);
 
 server.listen(3000, function() {
