TypeError Integer is not JSON serializable when serializing JSON in Python

Question

I am trying to send a simple dictionary to a json file from python  but I keep getting the  TypeError  1425 is not JSON serializable  message   import json alerts     upper   1425   lower   576   level   2   datetime    2012-08-08 15 30    afile   open  test json   w   afile write json dumps alerts encoding  UTF-8    afile close     If I add the default argument  then it writes  but the integer values are written to the json file as strings  which is undesirable   afile write json dumps alerts encoding  UTF-8  default str

User · Answer

Just convert numbers from int64  from numpy  to int   For example  if variable x is a int64   int x    If is array of int64   map int  x

User · Answer

You have Numpy Data Type  Just change to normal int   or float   data type  it will work fine

User · Answer

This solved the problem for me   def serialize self       return           my int  int self my int            my float  float self my float

User · Answer

Alternatively you can convert your object into a dataframe first   df   pd DataFrame obj    and then save this dataframe in a json file   df to json path or buf  df json     Hope this helps

User · Answer

It seems like there may be a issue to dump numpy int64 into json string in Python 3 and the python team already have a conversation about it  More details can be found here   There is a workaround provided by Serhiy Storchaka  It works very well so I paste it here   def convert o       if isinstance o  numpy int64   return int o        raise TypeError  json dumps   value   numpy int64 42    default convert

User · Answer

This might be the late response  but recently i got the same error  After lot of surfing this solution helped me   alerts     upper   1425   lower   576   level   2   datetime    2012-08-08 15 30    def myconverter obj           if isinstance obj  np integer               return int obj          elif isinstance obj  np floating               return float obj          elif isinstance obj  np ndarray               return obj tolist           elif isinstance obj  datetime datetime               return obj   str       Call myconverter in json dumps   like below  json dumps alerts  default myconverter

User · Answer

Same problem  List contained numbers of type numpy int64 which throws a TypeError  Quick workaround for me was to mylist   eval str mylist of integers   json dumps   mylist   mylist    which converts list to str   and eval   function evaluates the String like a Python expression and returns the result as a list of integers in my case

User · Answer

as  JAC pointed out in the comments of the highest rated answer  the generic solution  for all numpy types  can be found in the thread  Converting numpy dtypes to native python types    Nevertheless  I  ll add my version of the solution below  as my in my case I needed a generic solution that combines these answers and with the answers of the other thread  This should work with almost all numpy types   def convert o       if isinstance o  np generic   return o item         raise TypeError  json dumps   value   numpy int64 42    default convert

User · Answer

Use the below code to resolve the issue  import json from numpyencoder import NumpyEncoder alerts     upper   1425   lower   576   level   2   datetime    2012-08-08  15 30    afile   open  test json   w   afile write json dumps alerts encoding  UTF-8  cls NumpyEncoder   afile close

User · Answer

I found my problem  The issue was that my integers were actually type numpy int64

[python] "TypeError: (Integer) is not JSON serializable" when serializing JSON in Python?

Just convert numbers from `int64` (from numpy) to `int`.

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