collection = db.files

list all files in S3 bucket

response = s3.list_objects_v2( Bucket=bucket_name )

iterate over files in S3 bucket

for obj in response['Contents']: # check if file already exists in MongoDB if not db.files.find_one({'key': obj['Key']}): # if file does not exist, add to MongoDB file_metadata = { 'key': obj['Key'], 'size': obj['Size'], 'last_modified': obj['LastModified'] } db.files.insert_one(file_metadata)