How to use the json-server.port function in json-server

"strict": false,
    "end": false
  }, serveStatic(path.resolve(appDir, "public")));
  console.log("Serve static directory:", path.resolve(appDir, "public"));
}

// DB file
app.low.path = path.resolve(appDir, "db.json");
if (!fs.existsSync(app.low.path)) {
  fs.writeFileSync(app.low.path, "{}");
}
app.low.db = require(app.low.path);

// Now the real HTTP server
var server = http.createServer(app);
app.port = process.env.PORT || 26080;

server.listen(app.port);

server.on("listening", function () {
  console.log("Server ready:", this.address());
});

// Emit on each request
function ping (name, req) {
  if (req.method !== "GET") {
    setTimeout(function () {
      process.emit("data-update");
    }, 100);
  }
  process.emit("request", req.method, req.url, req.body);
}