• miniBill/elm-codec - JSON codec library
• MartinSStewart/elm-codec-bytes

Backwards compatibility

• elm-codec's FAQ section on backwards compatability

• Mario Rogic's talk on Elm Evergreen
• Mario Rogic's talk on Lamdera

Keeping data in sync

• Elm Radio episode on elm-graphql
• Two Generals Problem

Elm codec API - string, Bool, object

• MartinSStewart/elm-serialize/latest/, encodes in a format that is optimized for compactness