Plain Express OAuth client

basic-express-oauth.js

const express = require("express");
const bodyParser = require("body-parser");
const request = require("superagent");

const app = express();

app.use(bodyParser.json());

app.get("/callback", (req, res, next) => {
  return request
    .post("https://api.typeform.com/oauth/token")
    .type("form")
    .send({
      code: req.query.code,
      client_id: "xxx",
      client_secret: "yyy",
      redirect_uri: "http://localhost:9001"
    })
    .then(r => {
      return res.send(`
        Your token is ${r.body.access_token}!!
      `);
    })
    .catch(err => {
      console.error(err);
    });
});

app.listen(9001, () => {
  console.log('Server running on  http://localhost:9001' );
});