res.setHeader(“Set-Cookie”, …) is not setting the cookie in Node / Express

Question

I have tried

  res.setHeader(
    "Set-Cookie",
    cookie.serialize("name", "name2", { path: "/", domain: "localhost" })

and

  res.setHeader(
    "Set-Cookie",
    cookie.serialize("name", "name2"))

and I have tried to set the cookie outright with

res.setHeader(
    "Set-Cookie",
    "name=name"})

but no cookie is set when I examine the res, and no cookie is received in my frontend. Everything is run locally. I do not understand why.

Answer 1

如果您只想制作一个cookie，请尝试使用它而不是res.setHeader() ：

res.cookie('cookieName', 'cookieValue');

Answer 2

I found the answer. When using fetch() from the front end I didn't set the credentials flag to include. When I included the flag it worked instantly.

  return await fetch(
    `url`,
    { credentials: "include" }