If you want to be particularly vindictive, you could learn a written language (or at least the signs of it) that, while technically in Unicode, requires an impossible-to-find font that's not supported by most editors. Linear A should do the trick nicely. And maybe throw in a little Klingon as well. Just to make it that much more annoying to try and fix the JSON.
perl -e 'use Crypt::Digest::SHA256 qw[sha256_hex]; print substr(sha256_hex("the Answer To Life, The Universe And Everything"), 6, 2), "\n";'