[Python] How to upload a CSV file in FastAPI and convert it into JSON?

I am trying to upload my .csv file to my FastAPI server, then convert it into JSON and return it to the client. However, when I try to process it directly (without storing it somewhere), I get this error:

Error : FileNotFoundError: [Error 2] No such file or directory : "testdata.csv"


This is my FastAPI code:

async def upload(file: UploadFile = File(...)):
data = {}
with open(file.filename,encoding='utf-8') as csvf:
csvReader = csv.DictReader(csvf)
for rows in csvReader:
key = rows['No']
data[key] = rows
return {data}```

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