Dev / Config
Properties ↔ JSON.
Spring, Maven, and Gradle still ship .properties files. Paste one side, get the other — with sensible handling of =, :, and line continuations.
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Escaping rules
Properties files escape = and : in keys with backslash, use \n for newlines in values, and ignore # comment lines. JSON round-trips lose ordering (objects are unordered).
Further reading: JSON, YAML, and TOML compared.