diff --git a/src/http.ts b/src/http.ts
index 9b5ac1b..474af47 100644
--- a/src/http.ts
+++ b/src/http.ts
@@ -82,6 +82,10 @@ import {
   AddModToCommunityResponse,
   GetFollowedCommunitiesResponse,
   PasswordResetResponse,
+  PostJoinForm,
+  PostJoinResponse,
+  CommunityJoinForm,
+  CommunityJoinResponse,
 } from './interfaces';
 
 enum HttpType {
@@ -323,6 +327,14 @@ export class LemmyHttp {
     return this.wrapper(HttpType.Post, '/user/join', form);
   }
 
+  async postJoin(form: PostJoinForm): Promise<PostJoinResponse> {
+    return this.wrapper(HttpType.Post, '/post/join', form);
+  }
+
+  async communityJoin(form: CommunityJoinForm): Promise<CommunityJoinResponse> {
+    return this.wrapper(HttpType.Post, '/community/join', form);
+  }
+
   async banUser(form: BanUserForm): Promise<BanUserResponse> {
     return this.wrapper(HttpType.Post, '/user/ban', form);
   }
diff --git a/src/interfaces.ts b/src/interfaces.ts
index 608e2d8..515abec 100644
--- a/src/interfaces.ts
+++ b/src/interfaces.ts
@@ -57,6 +57,8 @@ export enum UserOperation {
   GetComments,
   GetSiteConfig,
   SaveSiteConfig,
+  PostJoin,
+  CommunityJoin,
 }
 
 export enum SortType {
@@ -961,7 +963,25 @@ export interface UserJoinForm {
 }
 
 export interface UserJoinResponse {
-  user_id: number;
+  joined: boolean;
+}
+
+export interface PostJoinForm {
+  post_id: number;
+  auth: string;
+}
+
+export interface PostJoinResponse {
+  joined: boolean;
+}
+
+export interface CommunityJoinForm {
+  community_id: number;
+  auth: string;
+}
+
+export interface CommunityJoinResponse {
+  joined: boolean;
 }
 
 export type MessageType =
diff --git a/src/websocket.ts b/src/websocket.ts
index 9405599..76d139b 100644
--- a/src/websocket.ts
+++ b/src/websocket.ts
@@ -53,6 +53,8 @@ import {
   GetSiteForm,
   SiteConfigForm,
   MarkAllAsReadForm,
+  PostJoinForm,
+  CommunityJoinForm,
 } from './interfaces';
 
 export class LemmyWebsocket {
@@ -66,6 +68,14 @@ export class LemmyWebsocket {
     return wrapper(UserOperation.UserJoin, form);
   }
 
+  postJoin(form: PostJoinForm): string {
+    return wrapper(UserOperation.PostJoin, form);
+  }
+
+  communityJoin(form: CommunityJoinForm): string {
+    return wrapper(UserOperation.CommunityJoin, form);
+  }
+
   register(registerForm: RegisterForm) {
     return wrapper(UserOperation.Register, registerForm);
   }