Add chat app

Author: olhakoreniuk-debug

.gitignore

@@ -0,0 +1,3 @@
+node_modules/
+.env
+.DS_Store

chat-app/backend/index.js

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+const express = require("express");
+const cors = require("cors");
+
+const app = express();
+const port = process.env.PORT || 3000;
+
+app.use(cors());
+app.use(express.json());
+
+let messages = [];
+
+app.get("/", (req, res) => {
+  res.json({ status: "Chat backend is running" });
+});
+
+app.get("/messages", (req, res) => {
+  res.json(messages);
+});
+
+app.post("/messages", (req, res) => {
+  const { name, text } = req.body;
+
+  if (!name || !text) {
+    return res.status(400).json({ error: "Name and message are required." });
+  }
+
+  const message = {
+    id: Date.now(),
+    name,
+    text,
+    likes: 0,
+    createdAt: new Date().toISOString(),
+  };
+
+  messages.push(message);
+  res.status(201).json(message);
+});
+
+app.post("/messages/:id/like", (req, res) => {
+  const id = Number(req.params.id);
+  const message = messages.find((item) => item.id === id);
+
+  if (!message) {
+    return res.status(404).json({ error: "Message not found." });
+  }
+
+  message.likes += 1;
+  res.json(message);
+});
+
+app.listen(port, () => {
+  console.log(`Chat backend listening on port ${port}`);
+});