add chat api

Author: JVancata

apps/chat-api/Dockerfile

@@ -0,0 +1,11 @@
+FROM node:24.8-alpine
+
+ENV NODE_ENV=production
+
+COPY package.json .
+RUN npm install
+
+COPY . .
+
+CMD ["node", "index.ts"]
+EXPOSE 3000

apps/chat-api/index.ts

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+import express from 'express'
+import cors from 'cors'
+
+const app = express()
+const port = 3000
+
+app.use(cors())
+app.use(express.json());
+
+type Message = {
+    username: string,
+    message: string
+}
+
+const messages: Message[] = [];
+
+app.get('/', (_req, res) => {
+    res.json(messages);
+})
+
+app.post("/", (req, res) => {
+    const contentTypeHeader = req.headers["content-type"];
+    if (contentTypeHeader !== "application/json") {
+        res.status(415);
+        res.send('Error: Content-Type must be "application/json"')
+        return;
+    }
+
+    const { username, message } = req.body;
+    if (!username || !message) {
+        res.status(422);
+        res.send('Error: Body of the request is not complete, correct value is: {"username": "User", "message": "Hello!"}');
+        return;
+    }
+
+    if (typeof username !== "string" || typeof message !== "string") {
+        res.status(422);
+        res.send("Error: Username and message have to be a string");
+        return;
+    }
+
+    messages.push({ username, message });
+
+    res.json(messages);
+    return;
+})
+
+app.listen(port, () => {
+    console.log(`chat-api running on port ${port}`)
+})

apps/chat-api/package.json

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+{
+  "name": "chat-api",
+  "version": "1.0.0",
+  "main": "index.ts",
+  "type": "module",
+  "scripts": {
+    "dev": "node --watch --experimental-strip-types index.ts",
+    "docker:build": "docker build -t chat-api .",
+    "docker:run": "docker run -d -p 3000:3000 chat-api"
+  },
+  "author": "",
+  "license": "ISC",
+  "description": "",
+  "dependencies": {
+    "cors": "^2.8.5",
+    "express": "^5.1.0"
+  },
+  "devDependencies": {
+    "@types/cors": "^2.8.18",
+    "@types/express": "^5.0.2"
+  }
+}