diff --git a/src/App.tsx b/src/App.tsx
index 017957182..f70d28edb 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -1,60 +1,118 @@
-import classNames from 'classnames';
+import { FC, useEffect, useState } from 'react';
+import cn from 'classnames';
 
-import 'bulma/css/bulma.css';
-import '@fortawesome/fontawesome-free/css/all.css';
-import './App.scss';
+import { User } from './types/User';
+import { Post } from './types/Post';
+
+import { getPosts, getUsers } from './utils/api';
 
 import { PostsList } from './components/PostsList';
 import { PostDetails } from './components/PostDetails';
 import { UserSelector } from './components/UserSelector';
 import { Loader } from './components/Loader';
 
-export const App = () => (
-  <main className="section">
-    <div className="container">
-      <div className="tile is-ancestor">
-        <div className="tile is-parent">
-          <div className="tile is-child box is-success">
-            <div className="block">
-              <UserSelector />
-            </div>
+import 'bulma/css/bulma.css';
+import '@fortawesome/fontawesome-free/css/all.css';
+import './App.scss';
 
-            <div className="block" data-cy="MainContent">
-              <p data-cy="NoSelectedUser">No user selected</p>
+export const App: FC = () => {
+  const [users, setUsers] = useState<User[]>([]);
+  const [selectedUser, setSelectedUser] = useState<User | null>(null);
 
-              <Loader />
+  const [userPosts, setUserPosts] = useState<Post[]>([]);
+  const [selectedPost, setSelectedPost] = useState<Post | null>(null);
 
-              <div
-                className="notification is-danger"
-                data-cy="PostsLoadingError"
-              >
-                Something went wrong!
-              </div>
+  const [isLoading, setIsLoading] = useState(false);
+  const [isError, setIsError] = useState(false);
+
+  const noUsersPosts =
+    !userPosts.length && selectedUser && !isLoading && !isError;
+
+  useEffect(() => {
+    setIsLoading(true);
+    setIsError(false);
 
-              <div className="notification is-warning" data-cy="NoPostsYet">
-                No posts yet
+    getUsers()
+      .then(setUsers)
+      .catch(() => setIsError(true))
+      .finally(() => setIsLoading(false));
+  }, []);
+
+  useEffect(() => {
+    if (!selectedUser) {
+      return;
+    }
+
+    setIsLoading(true);
+    setIsError(false);
+    setUserPosts([]);
+    setSelectedPost(null);
+
+    getPosts(selectedUser.id)
+      .then(setUserPosts)
+      .catch(() => setIsError(true))
+      .finally(() => setIsLoading(false));
+  }, [selectedUser]);
+
+  return (
+    <main className="section">
+      <div className="container">
+        <div className="tile is-ancestor">
+          <div className="tile is-parent">
+            <div className="tile is-child box is-success">
+              <div className="block">
+                <UserSelector
+                  users={users}
+                  selectedUser={selectedUser}
+                  onSelectUser={setSelectedUser}
+                />
               </div>
 
-              <PostsList />
+              <div className="block" data-cy="MainContent">
+                {!selectedUser && (
+                  <p data-cy="NoSelectedUser">No user selected</p>
+                )}
+
+                {isLoading && <Loader />}
+
+                {isError && !isLoading && (
+                  <div
+                    className="notification is-danger"
+                    data-cy="PostsLoadingError"
+                  >
+                    Something went wrong!
+                  </div>
+                )}
+
+                {noUsersPosts && (
+                  <div className="notification is-warning" data-cy="NoPostsYet">
+                    No posts yet
+                  </div>
+                )}
+
+                {!!userPosts.length && selectedUser && (
+                  <PostsList
+                    posts={userPosts}
+                    selectedPost={selectedPost}
+                    onSelectPost={setSelectedPost}
+                  />
+                )}
+              </div>
             </div>
           </div>
-        </div>
 
-        <div
-          data-cy="Sidebar"
-          className={classNames(
-            'tile',
-            'is-parent',
-            'is-8-desktop',
-            'Sidebar',
-            'Sidebar--open',
-          )}
-        >
-          <div className="tile is-child box is-success ">
-            <PostDetails />
+          <div
+            data-cy="Sidebar"
+            className={cn('tile', 'is-parent', 'is-8-desktop', 'Sidebar', {
+              'Sidebar--open': selectedPost,
+            })}
+          >
+            <div className="tile is-child box is-success ">
+              {selectedPost && <PostDetails post={selectedPost} />}
+            </div>
           </div>
         </div>
       </div>
-    </div>
-  </main>
-);
+    </main>
+  );
+};
diff --git a/src/components/NewCommentForm.tsx b/src/components/NewCommentForm.tsx
index 73a8a0b45..f19f1235b 100644
--- a/src/components/NewCommentForm.tsx
+++ b/src/components/NewCommentForm.tsx
@@ -1,103 +1,206 @@
-import React from 'react';
+import {
+  ChangeEvent,
+  Dispatch,
+  FC,
+  FormEvent,
+  SetStateAction,
+  useState,
+} from 'react';
+import cn from 'classnames';
+
+import { Comment } from '../types/Comment';
+import { addComment } from '../utils/api';
+
+const initialFormData = { name: '', email: '', body: '' };
+const initialFromErrors = { name: false, email: false, body: false };
+
+interface Props {
+  postId: number;
+  updateComments: Dispatch<SetStateAction<Comment[]>>;
+}
+
+export const NewCommentForm: FC<Props> = ({ postId, updateComments }) => {
+  const [formData, setFormData] = useState(initialFormData);
+  const [formErrors, setFormErrors] = useState(initialFromErrors);
+
+  const [isLoading, setIsLoading] = useState(false);
+  const [isError, setIsError] = useState(false);
+
+  const handleChangeField = (
+    event: ChangeEvent<HTMLInputElement | HTMLTextAreaElement>,
+  ) => {
+    const { name, value } = event.target;
+
+    setFormData(prevData => ({ ...prevData, [name]: value.trimStart() }));
+  };
+
+  const handleResetForm = () => {
+    setFormData(initialFormData);
+    setFormErrors(initialFromErrors);
+  };
+
+  const handleFormSubmit = (event: FormEvent<HTMLFormElement>) => {
+    event.preventDefault();
+
+    const { name, email, body } = formData;
+    const trimmedData = {
+      name: name.trim(),
+      email: email.trim(),
+      body: body.trim(),
+    };
+
+    setFormErrors({
+      name: !trimmedData.name,
+      email: !trimmedData.email,
+      body: !trimmedData.body,
+    });
+
+    if (!trimmedData.name && !trimmedData.email && !trimmedData.body) {
+      return;
+    }
+
+    setIsLoading(true);
+
+    addComment({
+      postId,
+      ...trimmedData,
+    })
+      .then(comment => {
+        updateComments(prevComments => [...prevComments, comment]);
+        setFormData(prevState => ({ ...prevState, body: '' }));
+      })
+      .catch(() => setIsError(true))
+      .finally(() => setIsLoading(false));
+  };
 
-export const NewCommentForm: React.FC = () => {
   return (
-    <form data-cy="NewCommentForm">
-      <div className="field" data-cy="NameField">
-        <label className="label" htmlFor="comment-author-name">
-          Author Name
-        </label>
-
-        <div className="control has-icons-left has-icons-right">
-          <input
-            type="text"
-            name="name"
-            id="comment-author-name"
-            placeholder="Name Surname"
-            className="input is-danger"
-          />
-
-          <span className="icon is-small is-left">
-            <i className="fas fa-user" />
-          </span>
-
-          <span
-            className="icon is-small is-right has-text-danger"
-            data-cy="ErrorIcon"
-          >
-            <i className="fas fa-exclamation-triangle" />
-          </span>
+    <>
+      {isError && (
+        <div className="notification is-danger" data-cy="AddCommentError">
+          Something went wrong!
         </div>
+      )}
+
+      <form
+        data-cy="NewCommentForm"
+        onSubmit={handleFormSubmit}
+        onReset={handleResetForm}
+      >
+        <div className="field" data-cy="NameField">
+          <label className="label" htmlFor="comment-author-name">
+            Author Name
+          </label>
+
+          <div className="control has-icons-left has-icons-right">
+            <input
+              type="text"
+              name="name"
+              id="comment-author-name"
+              placeholder="Name Surname"
+              value={formData.name}
+              onChange={handleChangeField}
+              className={cn('input', { 'is-danger': formErrors.name })}
+            />
+
+            <span className="icon is-small is-left">
+              <i className="fas fa-user" />
+            </span>
+
+            {formErrors.name && (
+              <span
+                className="icon is-small is-right has-text-danger"
+                data-cy="ErrorIcon"
+              >
+                <i className="fas fa-exclamation-triangle" />
+              </span>
+            )}
+          </div>
 
-        <p className="help is-danger" data-cy="ErrorMessage">
-          Name is required
-        </p>
-      </div>
-
-      <div className="field" data-cy="EmailField">
-        <label className="label" htmlFor="comment-author-email">
-          Author Email
-        </label>
-
-        <div className="control has-icons-left has-icons-right">
-          <input
-            type="text"
-            name="email"
-            id="comment-author-email"
-            placeholder="email@test.com"
-            className="input is-danger"
-          />
-
-          <span className="icon is-small is-left">
-            <i className="fas fa-envelope" />
-          </span>
-
-          <span
-            className="icon is-small is-right has-text-danger"
-            data-cy="ErrorIcon"
-          >
-            <i className="fas fa-exclamation-triangle" />
-          </span>
+          {formErrors.name && (
+            <p className="help is-danger" data-cy="ErrorMessage">
+              Name is required
+            </p>
+          )}
         </div>
 
-        <p className="help is-danger" data-cy="ErrorMessage">
-          Email is required
-        </p>
-      </div>
-
-      <div className="field" data-cy="BodyField">
-        <label className="label" htmlFor="comment-body">
-          Comment Text
-        </label>
-
-        <div className="control">
-          <textarea
-            id="comment-body"
-            name="body"
-            placeholder="Type comment here"
-            className="textarea is-danger"
-          />
+        <div className="field" data-cy="EmailField">
+          <label className="label" htmlFor="comment-author-email">
+            Author Email
+          </label>
+
+          <div className="control has-icons-left has-icons-right">
+            <input
+              type="text"
+              name="email"
+              id="comment-author-email"
+              placeholder="email@test.com"
+              value={formData.email}
+              onChange={handleChangeField}
+              className={cn('input', { 'is-danger': formErrors.email })}
+            />
+
+            <span className="icon is-small is-left">
+              <i className="fas fa-envelope" />
+            </span>
+
+            {formErrors.email && (
+              <span
+                className="icon is-small is-right has-text-danger"
+                data-cy="ErrorIcon"
+              >
+                <i className="fas fa-exclamation-triangle" />
+              </span>
+            )}
+          </div>
+
+          {formErrors.email && (
+            <p className="help is-danger" data-cy="ErrorMessage">
+              Email is required
+            </p>
+          )}
         </div>
 
-        <p className="help is-danger" data-cy="ErrorMessage">
-          Enter some text
-        </p>
-      </div>
+        <div className="field" data-cy="BodyField">
+          <label className="label" htmlFor="comment-body">
+            Comment Text
+          </label>
+
+          <div className="control">
+            <textarea
+              id="comment-body"
+              name="body"
+              placeholder="Type comment here"
+              value={formData.body}
+              onChange={handleChangeField}
+              className={cn('textarea', { 'is-danger': formErrors.body })}
+            />
+          </div>
 
-      <div className="field is-grouped">
-        <div className="control">
-          <button type="submit" className="button is-link is-loading">
-            Add
-          </button>
+          {formErrors.body && (
+            <p className="help is-danger" data-cy="ErrorMessage">
+              Enter some text
+            </p>
+          )}
         </div>
 
-        <div className="control">
-          {/* eslint-disable-next-line react/button-has-type */}
-          <button type="reset" className="button is-link is-light">
-            Clear
-          </button>
+        <div className="field is-grouped">
+          <div className="control">
+            <button
+              type="submit"
+              className={cn('button is-link', { 'is-loading': isLoading })}
+            >
+              Add
+            </button>
+          </div>
+
+          <div className="control">
+            {/* eslint-disable-next-line react/button-has-type */}
+            <button type="reset" className="button is-link is-light">
+              Clear
+            </button>
+          </div>
         </div>
-      </div>
-    </form>
+      </form>
+    </>
   );
 };
diff --git a/src/components/PostDetails.tsx b/src/components/PostDetails.tsx
index 2f82db916..fa855df7b 100644
--- a/src/components/PostDetails.tsx
+++ b/src/components/PostDetails.tsx
@@ -1,106 +1,122 @@
-import React from 'react';
+import { FC, useEffect, useState } from 'react';
+
+import { Post } from '../types/Post';
+import { Comment } from '../types/Comment';
+
+import { deleteComment, getPostComments } from '../utils/api';
+
 import { Loader } from './Loader';
 import { NewCommentForm } from './NewCommentForm';
 
-export const PostDetails: React.FC = () => {
+interface Props {
+  post: Post;
+}
+
+export const PostDetails: FC<Props> = ({ post }) => {
+  const [comments, setComments] = useState<Comment[]>([]);
+  const [isLoading, setIsLoading] = useState(false);
+  const [error, setError] = useState(false);
+  const [isForm, setIsForm] = useState(false);
+
+  const handleDeleteComment = (commentId: number) => {
+    deleteComment(commentId).catch(() => {
+      setError(true);
+    });
+
+    setComments(currentComments =>
+      currentComments.filter(comment => comment.id !== commentId),
+    );
+  };
+
+  useEffect(() => {
+    if (!post.id) {
+      return;
+    }
+
+    setIsLoading(true);
+    setIsForm(false);
+    setError(false);
+    setComments([]);
+
+    getPostComments(post.id)
+      .then(setComments)
+      .catch(() => setError(true))
+      .finally(() => setIsLoading(false));
+  }, [post.id]);
+
   return (
     <div className="content" data-cy="PostDetails">
       <div className="content" data-cy="PostDetails">
         <div className="block">
-          <h2 data-cy="PostTitle">
-            #18: voluptate et itaque vero tempora molestiae
-          </h2>
-
-          <p data-cy="PostBody">
-            eveniet quo quis laborum totam consequatur non dolor ut et est
-            repudiandae est voluptatem vel debitis et magnam
-          </p>
+          <h2 data-cy="PostTitle">{`#${post.id}: ${post.title}`}</h2>
+
+          <p data-cy="PostBody">{post.body}</p>
         </div>
 
         <div className="block">
-          <Loader />
-
-          <div className="notification is-danger" data-cy="CommentsError">
-            Something went wrong
-          </div>
-
-          <p className="title is-4" data-cy="NoCommentsMessage">
-            No comments yet
-          </p>
-
-          <p className="title is-4">Comments:</p>
-
-          <article className="message is-small" data-cy="Comment">
-            <div className="message-header">
-              <a href="mailto:misha@mate.academy" data-cy="CommentAuthor">
-                Misha Hrynko
-              </a>
-              <button
-                data-cy="CommentDelete"
-                type="button"
-                className="delete is-small"
-                aria-label="delete"
-              >
-                delete button
-              </button>
-            </div>
+          {isLoading && <Loader />}
 
-            <div className="message-body" data-cy="CommentBody">
-              Some comment
-            </div>
-          </article>
-
-          <article className="message is-small" data-cy="Comment">
-            <div className="message-header">
-              <a href="mailto:misha@mate.academy" data-cy="CommentAuthor">
-                Misha Hrynko
-              </a>
-
-              <button
-                data-cy="CommentDelete"
-                type="button"
-                className="delete is-small"
-                aria-label="delete"
-              >
-                delete button
-              </button>
-            </div>
-            <div className="message-body" data-cy="CommentBody">
-              One more comment
-            </div>
-          </article>
-
-          <article className="message is-small" data-cy="Comment">
-            <div className="message-header">
-              <a href="mailto:misha@mate.academy" data-cy="CommentAuthor">
-                Misha Hrynko
-              </a>
-
-              <button
-                data-cy="CommentDelete"
-                type="button"
-                className="delete is-small"
-                aria-label="delete"
-              >
-                delete button
-              </button>
+          {error && !isLoading && (
+            <div className="notification is-danger" data-cy="CommentsError">
+              Something went wrong
             </div>
+          )}
 
-            <div className="message-body" data-cy="CommentBody">
-              {'Multi\nline\ncomment'}
-            </div>
-          </article>
-
-          <button
-            data-cy="WriteCommentButton"
-            type="button"
-            className="button is-link"
-          >
-            Write a comment
-          </button>
+          {!comments.length && !isLoading && !error && (
+            <p className="title is-4" data-cy="NoCommentsMessage">
+              No comments yet
+            </p>
+          )}
+
+          {!!comments.length && (
+            <>
+              <p className="title is-4">Comments:</p>
+
+              {comments.map(comment => (
+                <article
+                  className="message is-small"
+                  data-cy="Comment"
+                  key={comment.id}
+                >
+                  <div className="message-header">
+                    <a href={`mailto:${comment.email}`} data-cy="CommentAuthor">
+                      {comment.name}
+                    </a>
+
+                    <button
+                      data-cy="CommentDelete"
+                      type="button"
+                      className="delete is-small"
+                      aria-label="delete"
+                      onClick={() => handleDeleteComment(comment.id)}
+                    >
+                      delete button
+                    </button>
+                  </div>
+
+                  <div className="message-body" data-cy="CommentBody">
+                    {comment.body}
+                  </div>
+                </article>
+              ))}
+            </>
+          )}
+
+          {!isLoading && !isForm && !error && (
+            <button
+              data-cy="WriteCommentButton"
+              type="button"
+              className="button is-link"
+              onClick={() => setIsForm(true)}
+            >
+              Write a comment
+            </button>
+          )}
         </div>
 
-        <NewCommentForm />
+        {isForm && (
+          <NewCommentForm postId={post.id} updateComments={setComments} />
+        )}
       </div>
     </div>
   );
diff --git a/src/components/PostsList.tsx b/src/components/PostsList.tsx
index cf90f04b0..ee5c3fc73 100644
--- a/src/components/PostsList.tsx
+++ b/src/components/PostsList.tsx
@@ -1,86 +1,66 @@
-import React from 'react';
+import { Dispatch, FC, SetStateAction, useState } from 'react';
+import cn from 'classnames';
 
-export const PostsList: React.FC = () => (
-  <div data-cy="PostsList">
-    <p className="title">Posts:</p>
+import { Post } from './../types/Post';
 
-    <table className="table is-fullwidth is-striped is-hoverable is-narrow">
-      <thead>
-        <tr className="has-background-link-light">
-          <th>#</th>
-          <th>Title</th>
-          {/* eslint-disable-next-line jsx-a11y/control-has-associated-label */}
-          <th> </th>
-        </tr>
-      </thead>
+interface Props {
+  posts: Post[];
+  selectedPost: Post | null;
+  onSelectPost: Dispatch<SetStateAction<Post | null>>;
+}
 
-      <tbody>
-        <tr data-cy="Post">
-          <td data-cy="PostId">17</td>
+export const PostsList: FC<Props> = ({ posts, selectedPost, onSelectPost }) => {
+  const [isPostOpened, setIsPostOpened] = useState(false);
 
-          <td data-cy="PostTitle">
-            fugit voluptas sed molestias voluptatem provident
-          </td>
+  const handlerOpeningPost = (post: Post) => {
+    const isSamePost = selectedPost?.id === post.id;
 
-          <td className="has-text-right is-vcentered">
-            <button
-              type="button"
-              data-cy="PostButton"
-              className="button is-link is-light"
-            >
-              Open
-            </button>
-          </td>
-        </tr>
+    setIsPostOpened(!isSamePost);
+    onSelectPost(isSamePost ? null : post);
+  };
 
-        <tr data-cy="Post">
-          <td data-cy="PostId">18</td>
+  return (
+    <div data-cy="PostsList">
+      <p className="title">Posts:</p>
 
-          <td data-cy="PostTitle">
-            voluptate et itaque vero tempora molestiae
-          </td>
+      <table className="table is-fullwidth is-striped is-hoverable is-narrow">
+        <thead>
+          <tr className="has-background-link-light">
+            <th>#</th>
+            <th>Title</th>
+            {/* eslint-disable-next-line jsx-a11y/control-has-associated-label */}
+            <th> </th>
+          </tr>
+        </thead>
 
-          <td className="has-text-right is-vcentered">
-            <button
-              type="button"
-              data-cy="PostButton"
-              className="button is-link"
-            >
-              Close
-            </button>
-          </td>
-        </tr>
+        <tbody>
+          {posts.map(post => {
+            const activePost =
+              selectedPost?.id === post.id ? isPostOpened : null;
 
-        <tr data-cy="Post">
-          <td data-cy="PostId">19</td>
-          <td data-cy="PostTitle">adipisci placeat illum aut reiciendis qui</td>
+            return (
+              <tr data-cy="Post" key={post.id}>
+                <td data-cy="PostId">{post.id}</td>
 
-          <td className="has-text-right is-vcentered">
-            <button
-              type="button"
-              data-cy="PostButton"
-              className="button is-link is-light"
-            >
-              Open
-            </button>
-          </td>
-        </tr>
+                <td data-cy="PostTitle">{post.title}</td>
 
-        <tr data-cy="Post">
-          <td data-cy="PostId">20</td>
-          <td data-cy="PostTitle">doloribus ad provident suscipit at</td>
-
-          <td className="has-text-right is-vcentered">
-            <button
-              type="button"
-              data-cy="PostButton"
-              className="button is-link is-light"
-            >
-              Open
-            </button>
-          </td>
-        </tr>
-      </tbody>
-    </table>
-  </div>
-);
+                <td className="has-text-right is-vcentered">
+                  <button
+                    type="button"
+                    data-cy="PostButton"
+                    className={cn('button is-link', {
+                      'is-light': !activePost,
+                    })}
+                    onClick={() => handlerOpeningPost(post)}
+                  >
+                    {activePost ? 'Close' : 'Open'}
+                  </button>
+                </td>
+              </tr>
+            );
+          })}
+        </tbody>
+      </table>
+    </div>
+  );
+};
diff --git a/src/components/UserSelector.tsx b/src/components/UserSelector.tsx
index c89442841..3cdbb0572 100644
--- a/src/components/UserSelector.tsx
+++ b/src/components/UserSelector.tsx
@@ -1,16 +1,51 @@
-import React from 'react';
+import { Dispatch, FC, SetStateAction, useState } from 'react';
+import cn from 'classnames';
+
+import { User } from '../types/User';
+
+interface Props {
+  users: User[];
+  selectedUser: User | null;
+  onSelectUser: Dispatch<SetStateAction<User | null>>;
+}
+
+export const UserSelector: FC<Props> = ({
+  users,
+  selectedUser,
+  onSelectUser,
+}) => {
+  const [isDropdownOpened, setIsDropdownOpened] = useState(false);
+
+  const handleToggleMenu = () => {
+    setIsDropdownOpened(prevState => !prevState);
+  };
+
+  const handleClickOutside = () => {
+    setIsDropdownOpened(false);
+  };
+
+  const handleChooseUser = (user: User) => {
+    onSelectUser(user);
+    setIsDropdownOpened(false);
+  };
 
-export const UserSelector: React.FC = () => {
   return (
-    <div data-cy="UserSelector" className="dropdown is-active">
+    <div
+      data-cy="UserSelector"
+      className={cn('dropdown', { 'is-active': isDropdownOpened })}
+    >
       <div className="dropdown-trigger">
         <button
           type="button"
           className="button"
           aria-haspopup="true"
           aria-controls="dropdown-menu"
+          onClick={handleToggleMenu}
+          onBlur={handleClickOutside}
         >
-          <span>Choose a user</span>
+          <span>
+            {selectedUser?.name ? selectedUser.name : 'Choose a user'}
+          </span>
 
           <span className="icon is-small">
             <i className="fas fa-angle-down" aria-hidden="true" />
@@ -20,21 +55,18 @@ export const UserSelector: React.FC = () => {
 
       <div className="dropdown-menu" id="dropdown-menu" role="menu">
         <div className="dropdown-content">
-          <a href="#user-1" className="dropdown-item">
-            Leanne Graham
-          </a>
-          <a href="#user-2" className="dropdown-item is-active">
-            Ervin Howell
-          </a>
-          <a href="#user-3" className="dropdown-item">
-            Clementine Bauch
-          </a>
-          <a href="#user-4" className="dropdown-item">
-            Patricia Lebsack
-          </a>
-          <a href="#user-5" className="dropdown-item">
-            Chelsey Dietrich
-          </a>
+          {users.map(user => (
+            <a
+              key={user.id}
+              href={`#user-${user.id}`}
+              className={cn('dropdown-item', {
+                'is-active': selectedUser?.id === user.id,
+              })}
+              onMouseDown={() => handleChooseUser(user)}
+            >
+              {user.name}
+            </a>
+          ))}
         </div>
       </div>
     </div>
diff --git a/src/utils/api.ts b/src/utils/api.ts
new file mode 100644
index 000000000..e0f914493
--- /dev/null
+++ b/src/utils/api.ts
@@ -0,0 +1,30 @@
+import { client } from './fetchClient';
+
+import { Comment } from '../types/Comment';
+import { Post } from '../types/Post';
+import { User } from '../types/User';
+
+export const getUsers = () => {
+  return client.get<User[]>('/users');
+};
+
+export const getPosts = (userId: number) => {
+  return client.get<Post[]>(`/posts?userId=${userId}`);
+};
+
+export const getPostComments = (postId: number) => {
+  return client.get<Comment[]>(`/comments?postId=${postId}`);
+};
+
+export const addComment = ({
+  postId,
+  name,
+  email,
+  body,
+}: Omit<Comment, 'id'>) => {
+  return client.post<Comment>('/comments', { postId, name, email, body });
+};
+
+export const deleteComment = (commentId: number) => {
+  return client.delete(`/comments/${commentId}`);
+};