react-openttd-admin/server/server.js

const express = require("express");
const app = express();
const cors = require("cors");

const corsOptions = {
    origin: ["http://localhost:5173"],
}
const port = 8080;

app.use(cors(corsOptions));

app.get("/api", (req, res) => {
    res.json({"foo": "bar"});
});

app.listen(port, ()=>{
    console.log("server started on port " + port);
});