Who Me Too'd this topic

I would like to get a refresh_token in Next.js, but no matter what I do, I cannot get one.

I would like to know how to do this.

Plan

Premium

Country

Japan

Device

PC

Operating System

Windows 10

My Question or Issue

The code is as follows

import { redirect_uri, client_id, client_secret, encode } from "@/module/env";

export default async function handle(req, res) {
  if (req.method === "POST") {
    const { code } = req.body;
    const url = "https://accounts.spotify.com/api/token";
    const params = new URLSearchParams();
    params.append("grant_type", "authorization_code");
    params.append("code", code);
    params.append("client_id", client_id || "");
    params.append("client_secret", client_secret || "");
    params.append("redirect_uri", redirect_uri || "/callback");
    const payload = {
      method: "POST",
      headers: {
        "Content-Type": "application/x-www-form-urlencoded",
      },
      body: params
    };
    const body = await fetch(url, payload);
    const response = await body.json();
    res.status(200).json(response);
  } else {
    res.status(405).json({ message: "We only support POST" }).end;
  }
}

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