Simple error handling

index.js

@@ -1,24 +1,6 @@
 const fetch = require('node-fetch');
 const encode = require('./lib/encode.js');
 
-/* appCredentials Object:
-let appCredentials = {
-    client: {
-        id: 'CLIENT_ID',
-        secret: 'CLIENT_SECRET'
-    },
-    uri: {
-        authorization: 'https://someauthorization.com/url',
-        token: 'https://api.sometoken.com/url',
-        redirect: 'https://myimportantapp.com/redirect'
-    },
-    scope: 'some scope and shit',
-    responseType: 'code'
-}
-
-*/
-
-// oauth.authorizationCodeUri(appCredentials).then((url) => {});
 exports.authorizationCodeUri = (appCredentials) => {
     return new Promise ((fulfill, reject) => {
         if (appCredentials.client.id === undefined) {
@@ -44,7 +26,13 @@ exports.getAccessToken = (app) => {
             },
             body: `client_id=${app.client.id}&grant_type=authorization_code&redirect_uri-&${encodeURI(app.uri.redirect)}&code=${app.code}`
         }).then((token) => {
-            fulfill(token.json());
+            let accessToken = token.json();
+
+            if (accessToken.error !== undefined) {
+                reject(accessToken);
+            } else {
+                fulfill(accessToken);
+            }
         }).catch((error) => {
             reject(error);
         });