Basic Discord OAuth2 Example

app.js

const { get, post } = require('snekfetch');
const express = require('express');
const btoa = require('btoa');
const app = express();

const cfg = {
  id: 'get_one',
  secret: 'get_one'
};

app.get('/', (req, res) => {
  res.redirect([
    'https://discordapp.com/oauth2/authorize',
    `?client_id=${cfg.id}`,
    '&scope=identify+guilds',
    '&response_type=code',
    `&callback_uri=http://localhost:8080/authorize`
  ].join(''));
});

app.get('/authorize', (req, res) => {
  const code = req.query.code;
  const cred = btoa(`${cfg.id}:${cfg.secret}`);
  post(`https://discordapp.com/api/oauth2/token?grant_type=authorization_code&code=${code}`)
    .set('Authorization', `Basic ${cred}`)
    .then(response => res.redirect(`/guilds?token=${response.body.access_token}`))
    .catch(console.error);
});

app.get('/guilds', (req, res) => {
  get('https://discordapp.com/api/v6/users/@me/guilds')
    .set('Authorization', `Bearer ${req.query.token}`)
    .then(response => res.json(response.body))
    .catch(console.error);
});

app.listen(8080, () => console.log('Ready'));

package.json

{
  "name": "oauth2",
  "version": "1.0.0",
  "description": "Basic OAuth2 Example",
  "private": true,
  "main": "app.js",
  "dependencies": {
    "btoa": "*",
    "express": "*",
    "snekfetch": "*"
  }
}

Missing "redirect_uri" in request.
Is This My Error, Or Yours?

You have to add the redirect uri to your application through the developer portal

I have an error. I've recived /guidls?token=undefined when /authorize redirect.

response.body.access_token = undefined...

any idea?

Mine says
error: 'invalid_request', error_description: 'Missing "code" in request.'
Any help?

how to run it

Mine says
error: 'invalid_request', error_description: 'Missing "code" in request.'
Any help?

discord/discord-api-docs#1701 (comment)

Missing "redirect_uri" in request.
Is This My Error, Or Yours?

You have to add your redirect URI. Add this if you're using localhost. http://localhost:8080/authorize

Mine Says 400 Bad Request

I get 400 or 401 status code.