Introducing Zod Codecs

Zod 4.1 introduced a new z.codec() API for defining bi-directional transformations in Zod. The problem with transformsZod's .transform() method is great for one-way data conversion: const stringToNumber = z.string().transform(val => parseFloat(val)); stringToNumber.parse("42"); // 42But what if you need to go both ways? Say, you're storing dates as ISO strings in a database but want to work with D

[jay-es]

Zod 4.1 で導入される Codec API について。文字列→数値、数値→文字列のような双方向の変換を.codec で定義しておき .encode/.decode で呼び出す。.parse は引数が unknown なのに対し、. decode は引数に型がつく