try {
        const res = await fetch(
          `http://localhost:9999/chart?start=${startTimestamp}&end=${endTimestamp}`
        );
        console.log("res", res)
        console.log("json", await res.json())

The first log (res) gives a response with a URL.

The response shows that the json is empty (length: 0)

However, when I press the link, it shows the data being properly populated

However, the second log (json) gives a response with an empty data:

json {"result":true,"message":"ok","data":[]}