CODEWITHSUNDEEP
pythonjsonpython-3.xnumpy
Zainab Saeed
Zainab Saeed

Reputation: 441

TypeError: Object of type bool_ is not JSON serializable

I am trying to write a dictionary to a json file with one of the values in boolean format. I get the following error when I am trying to run my code.

raise TypeError(f'Object of type {o.class.name} ' TypeError: Object of type bool_ is not JSON serializable

I am currently using Python for this purpose.

Upvotes: 34

Views: 28499

Answers (6)

Ahmad
Ahmad

Reputation: 9658

You can set a default for json:

print (json.dumps(mydict, indent=2, default=str))

Upvotes: 1

behzad behzadan
behzad behzadan

Reputation: 1

If you have a pandas dataframe and writing its values into a json file, you can do this:

bool(df['col_name_with_bool_values'].iat[0])

Upvotes: 0

Eric Le Fort
Eric Le Fort

Reputation: 2691

It's likely because of this issue (or something similar):

import numpy as np
import json

json.dumps({"X": np.int32(5) > 5})

TypeError: Object of type 'bool_' is not JSON serializable

The issue is that you end up with something of type bool_ instead of bool.

Calling bool()on whichever value(s) are of the wrong type will fix your issue (assuming your version of bool_ behaves similarly to numpy's):

json.dumps({"X": bool(np.int32(5) > 5)})

'{"X": false}'

Upvotes: 45

abroy77
abroy77

Reputation: 1

I solved this by converting the list from _bool type to bool type like this:

bool_list = np.array(bool_list, dtype=bool).tolist()

now calling:

json.dumps(bool_list)

should work

Upvotes: 0

Justas
Justas

Reputation: 5942

If you have multiple bool_ keys or a nested structure, this will convert all bool_ fields including deeply nested values, if any:

import json

class CustomJSONizer(json.JSONEncoder):
    def default(self, obj):
        return super().encode(bool(obj)) \
            if isinstance(obj, np.bool_) \
            else super().default(obj)

Then to convert the object/dict:

json.dumps(d, cls=CustomJSONizer)

Upvotes: 21

Rahul Mysore
Rahul Mysore

Reputation: 5

Convert the bool value to a string - dict["your_key"] = str(bool value)

Upvotes: -2

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