Behaviour implemented by every JSON codec.

Adapters convert between Elixir terms and JSON. encode/2 returns iodata (cheap to feed straight into a request body); decode/2 takes the raw response binary. Both accept a keyword list of codec-specific options and return a tagged tuple instead of raising, so the caller decides how to handle failures.

Decoding yields string-keyed maps unless the underlying codec is told otherwise through opts.

Bundled implementations:

• Dowser.Client.JSON.Native — Elixir's built-in JSON module (no dependency)
• Dowser.Client.JSON.Jason — the Jason library (optional dependency)
• Dowser.Client.JSON.Poison — the Poison library (optional dependency)