Function validate

Middleware that validates a request's route params, query and/or body with Zod. On failure it answers status (400) with the failed fields in details, by the response contract; malformed JSON is a 400 and a body that is neither JSON nor a form a 415. On success the handler reads the parsed data, typed, from c.get("validated"):

app.post("/users", validate({ body: z.object({ name: z.string() }) }), (c) => {
    const { name } = c.get("validated").body; // string
});
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A query field declared as an array takes every value of a repeated parameter (?id=1&id=2); the others take the first.