Obtain result of GET request in javascript (and Node.js)

I am trying to get a rudimentary GET request from a Node.js server when I click on a button.

server.js

const express = require('express');
const app = express();
app.use(express.static("./public"));

app.listen(8080, () => {
  console.log(`Service started on port 8080.`);
});

app.get('/clicks', (req, res) => {
  res.send("foobarbaz");
})

client.js

document.getElementById("button").addEventListener("click", showResult);
function showResult(){
  fetch('/clicks', {method: 'GET'})
    .then(function(response){
      if(response.ok){
        return response;
      }
      throw new Error('GET failed.');
    })
    .then(function(data){
      console.log(data);
    })
    .catch(function(error) {
      console.log(error);
    });
}

However, the console log shows:

Response {type: "basic", url: "http://localhost:8080/clicks", redirected: false, status: 200, ok: true, …}
body: (...)
bodyUsed: false
headers: Headers {}
ok: true
redirected: false
status: 200
statusText: "OK"
type: "basic"
url: "http://localhost:8080/clicks"
__proto__: Response

How can I get my "foobarbaz"?

If I go to localhost:8080/clicks the text shows up there.

Additionally, the response already seems to be a javascript object -- response.json() doesn't work.