The rfc 4627 for application/json
media type recommends unique keys but it doesn’t forbid them explicitly:
The names within an object SHOULD be unique.
From rfc 2119:
SHOULD This word, or the adjective “RECOMMENDED”, mean that there
may exist valid reasons in particular circumstances to ignore a
particular item, but the full implications must be understood and
carefully weighed before choosing a different course.
import json
def dict_raise_on_duplicates(ordered_pairs):
"""Reject duplicate keys."""
d = {}
for k, v in ordered_pairs:
if k in d:
raise ValueError("duplicate key: %r" % (k,))
else:
d[k] = v
return d
json.loads(raw_post_data, object_pairs_hook=dict_raise_on_duplicates)
# -> ValueError: duplicate key: u'1'