response.json() in node-fetch library also returns a promise, instead try
fetch('someurltoAJsonFile.json')
.then(response => response.json())
.then(data => {
console.log(data)
});
you can look up more details about it here
EDIT:
It seems that the returned response wasn't in the valid json, so for the sake of completeness here is a code for text
fetch('someurltoAJsonFile.json')
.then(response => response.text())
.then(data => {
console.log(data)
});
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