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How to Fix “datetime is not JSON serializable” TypeError in Python [All Method]️

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This blog code can help you solve errors.

Richard ParkerFebruary 8, 2022

1 minute read

How to Fix “datetime is not JSON serializable” TypeError in Python [All Method]️ — How to Fix datetime is not JSON serializable TypeError in Python All Method

The blog will help about How to Fix “datetime is not JSON serializable” TypeError in Python & learn how to solve different problems that come from coding errors. Error found! Why this could be happening? know and Learn everything.
Question: What is the best solution for this problem? Answer: This blog code can help you solve errors How to Fix “datetime is not JSON serializable” TypeError in Python. Question: What are the reasons for this code mistake and how can it be fixed? Answer: You can find a solution by following the advice in this blog.

Serializing a Python data structure as JSON is quite simple using json.dumps().

import json
d = {
  'dog': 'corgi'
}
print(json.dumps(d))
# {"dog": "corgi"}

Issue with `datetime` Serialization

However, what if we try to serialize a datetime object?

import json
import datetime
d = {
  'dog': 'corgi',
  'date': datetime.datetime.now()
}
print(json.dumps(d))
# TypeError: datetime.datetime(2020, 19, 8, 9, 1, 1, 100000) is not JSON serializable

Solution

We can use the default parameter in json.dumps() that will be called whenever it doesn’t know how to convert a value, like a datetime object.

We can write a converter function that stringifies our datetime object.

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def defaultconverter(o):
  if isinstance(o, datetime.datetime):
      return o.__str__()

Any object that requires special conversions can be added inside if statements in our defaultconverter method.

We can then pass this function into that default parameter.

import json
import datetime
d = {
  'dog': 'corgi',
  'date': datetime.datetime.now()
}
print(json.dumps(d, default = defaultconverter))
# {"date": "2020-19-08 09:01:01.100000", "dog": "corgi"}

Now you learned, How you can use & How to Fix “datetime is not JSON serializable” TypeError in Python.
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