Hono has some in-built cookie-helpers.

import { Hono } from 'hono'
import {
  getCookie,
  getSignedCookie,
  setCookie,
  setSignedCookie,
  deleteCookie,
} from 'hono/cookie'

Setting an auth cookie, for example:

setCookie(c, 'auth-session', sessionId, { maxAge: 3600, httpOnly: true, sameSite: 'Lax', secure: true }