When using next-router with nextjs and you set useFileSystemPublicRoutes: false, you need a server.js like this to find your home route. See https://spectrum.chat/?t=eeaebd2e-e337-401c-9e29-d7558202e76b

server.js

const { createServer } = require("http");
const next = require("next");
const routes = require("./routes");
const { parse } = require("url");

const port = parseInt(process.env.PORT, 10) || 3000;
const dev = process.env.NODE_ENV !== "production";
const app = next({ dev });
const handler = routes.getRequestHandler(app);

app.prepare().then(() => {
  createServer((req, res) => {
    const parsedUrl = parse(req.url, true);
    const { pathname, query } = parsedUrl;

    if (pathname === "/") {
      app.render(req, res, "/", query);
    } else {
      handler(req, res, parsedUrl);
    }
  }).listen(port, err => {
    if (err) throw err;
    console.log(`> Ready on http://localhost:${port}`);
  });
});