mutation {
  login(username:"admin", password:"nooneknows") {
    token
    user { id }
  }
}

# output

{
  "data": {
    "login": {
      "token": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJ1c2VySWQiOiJjamc0Mnd1cnYwMDFmMDkyMHppNG5hb3R2IiwiaWF0IjoxNTIzOTk1NDM5fQ.XbQ_ZhnVwP4rtBse9RgbIgSYlOr4Jw-IKXhqJ1fcq8U",
      "user": {
        "id": "cjg42wurv001f0920zi4naotv"
      }
    }
  }
}