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As per the Django JSONField docs, it explains that that the data
structure matches python native format, with a slightly different approach when querying.
If you know the structure of the JSON, you can also filter on keys as if they were related fields:
object.filter(data__animal='cat')
object.filter(data__name='tom')
By array access:
object.filter(data__0__animal='cat')
Your contains example is almost correct, but your data is in a list and requires:
object.filter(data__contains=[{'animal': 'cat'}])
Source:stackexchange.com