"bad escaped character" error in json

[makc]

e g this fbx file converts to this json file which fails to parse in firefox with following error:

SyntaxError: JSON.parse: bad escaped character at line 9141 column 53 of the JSON data

[makc]

the offending symbol combination in json is:

"name": "RPC Tree - Deciduous Scarlet Oak - 42\' [946164]"

the original data in fbx file:

[makc]

basically boils down to this:

escape backslashes and single quotes, both would render the JSON invalid if left as is

which is incorrect, single quote is just fine if left as is (proof).