diff --git a/src/main.py b/src/main.py
index 5eab71c..25b52ed 100644
--- a/src/main.py
+++ b/src/main.py
@@ -53,6 +53,14 @@ for root, dirs, files in os.walk('quotes/'):
                 csvreader = csv.DictReader(csvfile, delimiter=',', quotechar='`', skipinitialspace=True)
                 quotes += list(csvreader)
 
+for q in quotes:
+    # Check correct number of fields
+    assert (len(q) == 4),                                                           "Error: wrong number of fields in " + str(q)
+    # Check correct field names
+    assert ('quote' in q and 'author' in q and 'link' in q and 'linktitle' in q),   "Error: missing field in " + str(q)
+    # Check that no field is empty
+    assert (q['quote'] and q['author'] and q['link'] and q['linktitle']),           "Error: empty field in " + str(q)
+
 print(f"Found {len(quotes)} total quotes")
 
 row = random.choice(quotes)