diff --git a/internal/gtsmodel/application.go b/internal/gtsmodel/application.go
new file mode 100644
index 000000000..f8c36ca25
--- /dev/null
+++ b/internal/gtsmodel/application.go
@@ -0,0 +1,34 @@
+/*
+   GoToSocial
+   Copyright (C) 2021 GoToSocial Authors admin@gotosocial.org
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Affero General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU Affero General Public License for more details.
+
+   You should have received a copy of the GNU Affero General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+package gtsmodel
+
+type Application struct {
+	ID string `pg:"type:uuid,default:gen_random_uuid(),pk,notnull"`
+	Name string `json:"name"`
+	// The website associated with your application (url)
+	Website string `json:"website,omitempty"`
+	// Where the user should be redirected after authorization.
+	RedirectURI string `json:"redirect_uri"`
+	// ClientID to use when obtaining an oauth token for this application (ie., in client_id parameter of https://docs.joinmastodon.org/methods/apps/)
+	ClientID string `json:"client_id"`
+	// Client secret to use when obtaining an auth token for this application (ie., in client_secret parameter of https://docs.joinmastodon.org/methods/apps/)
+	ClientSecret string `json:"client_secret"`
+	// Used for Push Streaming API. Returned with POST /api/v1/apps. Equivalent to https://docs.joinmastodon.org/entities/pushsubscription/#server_key
+	VapidKey string `json:"vapid_key"`
+}
diff --git a/pkg/mastotypes/application.go b/pkg/mastotypes/application.go
index d2f894306..88128f71d 100644
--- a/pkg/mastotypes/application.go
+++ b/pkg/mastotypes/application.go
@@ -18,12 +18,38 @@
 
 package mastotypes
 
-// Application represents a mastodon-api Application, as defined here: https://docs.joinmastodon.org/entities/application/
+// Application represents a mastodon-api Application, as defined here: https://docs.joinmastodon.org/entities/application/.
+// Primarily, application is used for allowing apps like Tusky etc to connect to Mastodon on behalf of a user.
+// See https://docs.joinmastodon.org/methods/apps/
 type Application struct {
+	// The application ID in the db
+	ID string `json:"id,omitempty"`
 	// The name of your application.
 	Name string `json:"name"`
 	// The website associated with your application (url)
-	Website string `json:"website"`
+	Website string `json:"website,omitempty"`
+	// Where the user should be redirected after authorization.
+	RedirectURI string `json:"redirect_uri,omitempty"`
+	// ClientID to use when obtaining an oauth token for this application (ie., in client_id parameter of https://docs.joinmastodon.org/methods/apps/)
+	ClientID string `json:"client_id,omitempty"`
+	// Client secret to use when obtaining an auth token for this application (ie., in client_secret parameter of https://docs.joinmastodon.org/methods/apps/)
+	ClientSecret string `json:"client_secret,omitempty"`
 	// Used for Push Streaming API. Returned with POST /api/v1/apps. Equivalent to https://docs.joinmastodon.org/entities/pushsubscription/#server_key
 	VapidKey string `json:"vapid_key"`
 }
+
+// ApplicationPOSTRequest represents a POST request to https://example.org/api/v1/apps.
+// See here: https://docs.joinmastodon.org/methods/apps/
+// And here: https://docs.joinmastodon.org/client/token/
+type ApplicationPOSTRequest struct {
+	// A name for your application
+	ClientName string `form:"client_name"`
+	// Where the user should be redirected after authorization.
+	// To display the authorization code to the user instead of redirecting
+	// to a web page, use urn:ietf:wg:oauth:2.0:oob in this parameter.
+	RedirectURIs string `form:"redirect_uris"`
+	// Space separated list of scopes. If none is provided, defaults to read.
+	Scopes string `form:"scopes"`
+	// A URL to the homepage of your app
+	Website string `form:"website"`
+}