index.js

const express = require("express");
const dotenv = require("dotenv");
const bodyParser = require("body-parser");
const cors = require("cors");
const webpush = require("web-push");

const app = express();

dotenv.config();

app.use(cors());
app.use(bodyParser.json());

webpush.setVapidDetails(
  process.env.WEB_PUSH_CONTACT,
  process.env.PUBLIC_VAPID_KEY,
  process.env.PRIVATE_VAPID_KEY
);

app.get("/", (req, res) => {
  res.send("Hello world!");
});

app.post("/notifications/subscribe", (req, res) => {
  const subscription = req.body;

  console.log(subscription);

  const payload = JSON.stringify({
    title: "Hello!",
    body: "It works.",
  });

  webpush
    .sendNotification(subscription, payload)
    .then((result) => console.log(result))
    .catch((e) => console.log(e.stack));

  res.status(200).json({ success: true });
});

app.listen(9000, () =>
  console.log("The server has been started on the port 9000")
);