Checklist

• I have verified that that issue exists against themaster branch of Django REST framework.
• I have searched for similar issues in both open and closed tickets and cannot find a duplicate.
• This is not a usage question. (Those should be directed to thediscussion group instead.)
• This cannot be dealt with as a third party library. (We prefer new functionality to bein the form of third party libraries where possible.)
• I have reduced the issue to the simplest possible case.
• I have included a failing test as a pull request. (If you are unable to do so we can still accept the issue.)

Steps to reproduce

fromrest_frameworkimportserializersclassTestSerializer(serializers.Serializer):json=serializers.JSONField()s=TestSerializer(data={'json':"{broken JSON"})asserts.is_valid()isFalse

Expected behavior

Invalid JSON should result inis_valid() returningFalse.

Actual behavior

is_valid() returnsTrue

Specifyingbinary=True for the field definition results in the desired behavior for serialization, but causes deserialization to fail on Python 3.