evil === true

Found this one after 4 hours of debugging... Want to screw with other teams? Shove some UTF-8 BOM characters into JSON responses consumed by Node (and other frameworks as well). Watch as they scramble to find why JSON.parse() fails on seemingly nothing.

Background: BOM markers are hidden characters that indicate text stream information to applications. They are not ignored by many JSON parsers and throw exceptions that don't appear to make sense.