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.

Answer

The send() parameter should be a JSON. Change server.js to

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

Now you will receive a JSON as the response in client.js and the result can be consumed as

function showResult() {
    fetch('/clicks', { method: 'GET' })
        .then(function (response) {
            if (response.ok) {
                return response.json();
            }
            throw new Error('GET failed.');
        })
        .then(function (data) {
            console.log(data.result);
        })
        .catch(function (error) {
            console.log(error);
        });
}