I've found in the spec of XHR Level 2 that if a malformed JSON's received from 
a server, the response property would be set to null. But null is a valid JSON, 
so, if I understand correctly, there is no way to distinct a malformed JSON 
response from a response containing only 'null', which is, again, a valid JSON:

$ node -p -e 'JSON.parse("null")'

Kirill Dmitrenko
Yandex Maps Team

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