supanextail/pages/api/mailingList.js

import Cors from "cors";
import axios from "axios";
import initMiddleware from "utils/init-middleware";

const rateLimit = require("express-rate-limit");

export const config = {
  api: {
    externalResolver: true,
  },
};

const cors = initMiddleware(
  Cors({
    methods: ["PUT"],
  })
);

const limiter = initMiddleware(
  rateLimit({
    windowMs: 30000, // 30sec
    max: 2, // Max 2 request per 30 sec
  })
);

export default async function handler(req, res) {
  await cors(req, res);
  await limiter(req, res);
  if (req.method === "PUT") {
    axios
      .put(
        "https://api.sendgrid.com/v3/marketing/contacts",
        {
          contacts: [{ email: `${req.body.mail}` }],
          list_ids: [process.env.SENDGRID_MAILING_ID],
        },
        {
          headers: {
            "content-type": "application/json",
            Authorization: `Bearer ${process.env.SENDGRID_SECRET}`,
          },
        }
      )
      .then((result) => {
        console.log(result);
        res
          .status(200)
          .send({
            message:
              "Your email has been succesfully added to the mailing list. Welcome 👋",
          });
      })
      .catch((err) => {
        res.status(500).send({
          message:
            "Oups, there was a problem with your subscription, please try again or contact us",
        });
      });
  }
}