pandas read json not working on MultiIndex

Question

I\'m trying to read in a dataframe created via df.to_json() via pd.read_json but I\'m getting a ValueError. I think it may have to do

Answer 1

This is not implemented ATM, see the issue here: https://github.com/pydata/pandas/issues/4889.

You can simply reset the index first, e.g

df.reset_index().to_json(...)

and it will work.

Answer 2

Or you can just write json with orient = 'table'

df.to_json(path_or_buf='test.json', orient='table')

read multi_index json

pd.read_json('test.json', orient='table')

Answer 3

if you want to return MultiIndex structure:

 # save MultiIndex indexes names 
 indexes_names = df.index.names

 df.reset_index().to_json('dump.json')

 # return back MultiIndex structure:
 loaded_df = pd.read_json('dump.json').set_index(indexes_names)