I've read almost every thread about this and still can't figure out what's wrong.

Any information, either by res.send(), res.json(), res.write() res.end(), doesn't get received on the client side. But I know the info is getting sent and stored because the database is updating, and I know there is a response because I can console.log the object and if I change the server's status code (200 vs 201, for example) the response printed on the client side reflects that.

The client sends the email by post to the server.

var object = JSON.stringify({
      email: myemail,
    });
    await fetch('http://localhost:4000/api/subscriber/', {
      method: 'POST',
      body: object,
      headers: {
        'Content-Type': 'application/json'
      }
    }).then(res => {
      res.json();
    console.log(res);})
    .then(response => console.log('Success:', response))
    .catch(error => console.error('Error:', error));

When I run this, these are the logs:

Response {type: "cors", url: "http://localhost:4000/api/subscriber/", redirected: false, status: 201, ok: true, …}

Success: undefined

Here's the relevant server side code

Path calls a function

app.post('/api/subscriber/', (request, response) => {
   db.createSubscriber(request, response);
   })

I've read almost every thread about this and still can't figure out what's wrong.

Any information, either by res.send(), res.json(), res.write() res.end(), doesn't get received on the client side. But I know the info is getting sent and stored because the database is updating, and I know there is a response because I can console.log the object and if I change the server's status code (200 vs 201, for example) the response printed on the client side reflects that.

The client sends the email by post to the server.

var object = JSON.stringify({
      email: myemail,
    });
    await fetch('http://localhost:4000/api/subscriber/', {
      method: 'POST',
      body: object,
      headers: {
        'Content-Type': 'application/json'
      }
    }).then(res => {
      res.json();
    console.log(res);})
    .then(response => console.log('Success:', response))
    .catch(error => console.error('Error:', error));

When I run this, these are the logs:

Response {type: "cors", url: "http://localhost:4000/api/subscriber/", redirected: false, status: 201, ok: true, …}

Success: undefined

Here's the relevant server side code

Path calls a function

app.post('/api/subscriber/', (request, response) => {
   db.createSubscriber(request, response);
   })

Then the info is stored in the database and the response is sent. Here's where the problem is -- anything I try to send here -- even random text doesn't show up, but I know the communication is happening because I can see the status code logged from the client side when I change it.