Trying to call a Lit Action through an express server

index.js

const express = require("express");
const cors = require("cors");
const litJsSdk = require("lit-js-sdk");
const app = express();

var corsOptions = {
  origin: "*"
};

app.use(cors(corsOptions));
app.use(express.json());
app.use(express.urlencoded({ extended: true }));

app.get("/", async function (req, res) {

    try {
        res.send(await signatures);
    } catch (e) {
        console.log(e)
        res.send('error');
    }
    console.log(req.query.authSig)
});

const signatures = async () => { await litJsSdk.LitJsSdk.litNodeClient.executeJs({
    ipfsId: "Qme9L6jU4CStoBZL7etpwPVX7XPWJ59Z9IFXoTPXyfgXrT",
    authSig,
    // all jsParams can be used anywhere in your Lit Action Code
    jsParams: {
      // this is the string "Hello World" for testing
      toSign: [72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100],
      publicKey:
        "<MY PUBLIC KEY HERE>",
      sigName: "sig1",
    },
})};

// set port, listen for requests
const PORT = process.env.PORT || 8080;
app.listen(PORT, () => {
  console.log(`Server is running on port ${PORT}.`);
});