Node.js Express Download CSV File From Array of Objects Using objects to csv Library Full Tutorial

the code generates the csv but its not downloading it what could it be the problem?
try {
const cvs = new ObjectsToCsv(data)
await cvs.toDisk('./test.cvs')
console.log(await csv.toString());

res.download("./test.csv")
} catch (error) {
console.log(err+"error")
}

Thank you for this awesome and knowledgeable video. It help me in my project.