How Can I Serialize Decimal Objects to JSON in Python Without Losing Precision?

Serializing Decimal Objects to JSON in Python

When attempting to encode a Decimal object to a JSON string, users may encounter issues with JSONDecoder rejecting Decimal objects. Additionally, converting the Decimal object to a float beforehand can result in loss of precision.

Solution using Simplejson

Simplejson version 2.1 and higher provides native support for Decimal types. By default, Decimal objects are serialized as strings with the use_decimal parameter set to True. To utilize this feature:

import simplejson as json

json_string = json.dumps(Decimal('3.9'))
# Output: '3.9'

Anticipated Inclusion in Standard Library

This feature is expected to be incorporated into the Python standard library in the future, offering a more robust solution for serializing Decimal objects to JSON.

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