app.ts

import express from "express";

const app = express();
app.use(express.json());

function factorial(n) {
  if (n === 1) return 1;
  return n * factorial(n - 1);
}

app.get("/:number", async (req, res) => {
  res.status(200).json(factorial(req.params.number));
});

console.log("serving on http://localhost:3008");

app.listen(3008);