Search code examples
pythonjsonpandasflaskjsonp

Return Pandas dataframe as JSONP response in Python Flask

I want to return data as JSONPresponse in Flask.

The data comes from a Pandas dataframe and I can return it as JSON with the following line:

json_data = dataframe.to_json(orient='values')
return json_data

Works fine and I get the data, which looks like this:

[[1487310600000,1038,1042,1038,1038,-2.243,6.8933],[1487310900000,1042,1042,1038,1038,-1.3626,4.3058],[1487311200000,1042,1042,1038,1038,-1.4631,17.8684]]

But I need it as JSONP, so I use the following code:

from flask_jsonpify import jsonpify
json_data = dataframe.to_json(orient='values')
return jsonpify(json_data)

And it gives me the data, but with double quotes:

"[[1487310600000,1038,1042,1038,1038,-2.243,6.8933],[1487310900000,1042,1042,1038,1038,-1.3626,4.3058],[1487311200000,1042,1042,1038,1038,-1.4631,17.8684]]"

How can I get the JSONP response in Flask without double quotes? Many thanks in advance.

Solution

  • This is my solution to convert a Pandas dataframe to JSONP an return it in Flask:

    from flask_jsonpify import jsonpify
df_list = df.values.tolist()
JSONP_data = jsonpify(df_list)
return JSONP_data

    Depending on how you need the dataframe converted, you might need to create the list in a different way. For example like this:

    df_list = merged.values.T.tolist()

    Or like this: 

    df_list = list(df.values.flatten())

    Thanks goes to the user @Barmer