add server code

server/.gitignore

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+package-lock.json
+node_modules
+dist

server/package.json

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+{
+  "name": "service-api",
+  "version": "1.0.0",
+  "main": "index.js",
+  "license": "MIT",
+  "devDependencies": {
+    "@types/cors": "^2.8.12",
+    "@types/express": "^4.17.17",
+    "typescript": "^4.5.5"
+  },
+  "dependencies": {
+    "cors": "^2.8.5",
+    "express": "^4.18.2",
+    "ytdl-core": "npm:@distube/ytdl-core@^4.11.9"
+  },
+  "scripts": {
+    "build": "tsc",
+    "start": "node ./dist/index.js"
+  }
+}

server/src/download.ts

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+import { Router } from "express";
+const ytdl = require("ytdl-core");
+
+const router = Router();
+
+router.post("/download", async (req, res) => {
+  try {
+    const url = req.body.url;
+    const type = req.body.type;
+    if (!ytdl.validateURL(url))
+      return res.status(400).json({ message: "Invalid URL", code: 400 });
+    if (type !== "mp3" && type !== "mp4")
+      return res.status(400).json({ message: "Invalid type", code: 400 });
+    res.setHeader("Content-Type", type === "mp3" ? "audio/mpeg" : "video/mp4");
+    ytdl(url, {
+      format: type,
+      filter: type == "mp4" ? "videoandaudio" : "audioonly",
+    }).pipe(res);
+  } catch (e) {
+    console.log(e);
+  }
+});
+
+module.exports = router;

server/src/index.ts

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+import express from "express";
+import cors from "cors";
+
+const app = express();
+app.use(express.json());
+app.use(express.urlencoded({ extended: true }));
+app.use(cors());
+
+app.use("/api", require("./download"));
+
+app.listen(852, () => {
+  console.log("Server running on port 852");
+});
+
+process.on("uncaughtException", err => {
+  console.log(err);
+});

server/tsconfig.json

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+{
+  "compilerOptions": {
+    "target": "es5",
+    "module": "commonjs",
+    "outDir": "./dist",
+    "esModuleInterop": true,
+    "forceConsistentCasingInFileNames": true,
+    "strict": true,
+    "skipLibCheck": true
+  }
+}