How to flatten a pandas dataframe with some columns as json?

Question

I have a dataframe df that loads data from a database. Most of the columns are json strings while some are even list of jsons. For example:

id           


        

Answer 1

The quickest seems to be:

json_struct = json.loads(df.to_json(orient="records"))    
df_flat = pd.io.json.json_normalize(json_struct) #use pd.io.json