Express res.send or res.json doesn't contain a body - express

Question

I'm calling an API to fetch orders for a given user based on ID which are fetched from a third-party site. These are fetched correctly as a console.log them in the node server. But when I try to send the results back to the client neither res.send nor res.json results sending the data back to the client. Here is an example of an order from console.log:
{"customer":{"orders":{"edges":[{"node":{"id":"gid://shopify/Order/1234564564","lineItems":{"edges":[{"node":{"title":"Some title here"}}]}}}]}}}
Then on the client in the devtools when I console.log the response I get:
body:ReadableStream
locked:false
[[Prototype]]:ReadableStream
bodyUsed:false
headers:
Headers {}
ok:true
redirected:false
status:200
statusText:"OK"
type:"basic"
url:"http://localhost:9000/api/getOrders?cid=gid://shopify/Customer/1234564564"
[[Prototype]]:Response
Any help is appreciated.
=== UPDATE ===
I've now even tried the most basic of examples and am getting the same response on the client:
app.get('/testExpress', (req, res) => {
res.send("Hello")
});
Thanks to #laurent here is how I was able to receive that response on the client:
fetch('/testExpress')
.then(async (r) => {
const resp = await r.text();
console.log(resp);
})

Answer 1

You should try to get the json out of the response by const json = await response.json().
These are the available methods to parse the response body depending on what you want:
Response.arrayBuffer()
Returns a promise that resolves with an ArrayBuffer representation of the response body.
Response.blob()
Returns a promise that resolves with a Blob representation of the response body.
Response.clone()
Creates a clone of a Response object.
Response.formData()
Returns a promise that resolves with a FormData representation of the response body.
Response.json()
Returns a promise that resolves with the result of parsing the response body text as JSON.
Response.text()
Returns a promise that resolves with a text representation of the response body.
https://developer.mozilla.org/en-US/docs/Web/API/Response
The Response object is a representation of the http response. You should try to receive the body of the response by using one of these methods or parsing the body from the readable stream response.body.