More informative error when JSON attribute has wrong syntax

Dear all

I have a problem in modification of attributes in JSON format,

With a fairly complex attributes in JSON format of ROLE, if I made an
error (e…g missing comma, curly brace, apostrophe ) , the knife
command does not point
out the location near the error, so it is very difficult to find out
and correct it.

Is it anyway to get a better error message , perhaps by using better
JSON parser to parse it in advance?

The information in this electronic mail message is private and
confidential, and only intended for the addresses. Should you
receive this message by mistake, you are hereby notified that
any disclosure, reproduction, distribution or use of this
message is strictly prohibited. Please inform the sender by
reply transmission and delete the message without copying or
opening it.