facebook.js

const loginWithFacebook = async (req, res, next) => {
  try { 
    const user_resp = await axios.get(`https://graph.facebook.com/${GRAPH_API_VERSION}/me`, {
      params: {
        fields: "id, name, email, picture",
        access_token: req.body.access_token
      }
    });

    req.email = user_resp.data.email

    let profile = {
      email: user_resp.data.email,
      id: user_resp.data.id,
      name: user_resp.data.name,
      avatar_url: user_resp.data.picture.data.url
    };

    await User.upsertFacebookUser(profile);
  } catch (err) {
    console.log("====> facebook err: ", err);
    res.status(500).send({ auth: false, message: 'Failed to auth through facebook.' });
  }
  next();
}

app.post('/login/facebook', loginWithFacebook, issueJwt, (req, res) => {});