import json
BARCODE_DATA_FILE = r"C:\programdata\trancon\boxwisepro\blobs\BW Order\exports\Barcode 2022-04-21 100007136.json"
barcodes = {}
with open(BARCODE_DATA_FILE, "r") as f:
    for line in f:
        jsonDataForLine = json.loads(line)
        barcode = jsonDataForLine["Code"]
        if barcode not in barcodes:
            barcodes[barcode] = 0
        barcodes[barcode] += 1
    for barcode in filter(lambda x: barcodes[x] > 1, barcodes):
        print "Duplicate barcode \"{}\" occurs {} times".format(barcode, barcodes[barcode])