diff --git a/src/App.tsx b/src/App.tsx
index 81e011f432..a483c459a0 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -1,26 +1,366 @@
 /* eslint-disable max-len */
-/* eslint-disable jsx-a11y/control-has-associated-label */
-import React from 'react';
+import React, { useEffect, useMemo, useRef, useState } from 'react';
+import classNames from 'classnames';
 import { UserWarning } from './UserWarning';
+import { Todo } from './types/Todo';
+import * as todoService from './api/todos';
 
-const USER_ID = 0;
+const USER_ID = todoService.USER_ID || 0;
+
+type Filter = 'all' | 'active' | 'completed';
 
 export const App: React.FC = () => {
+  const [todos, setTodos] = useState<Todo[]>([]);
+  const [filter, setFilter] = useState<Filter>('all');
+  const [errorMessage, setErrorMessage] = useState('');
+  const [newTitle, setNewTitle] = useState('');
+  const [isAdding, setIsAdding] = useState(false);
+  const [loadingIds, setLoadingIds] = useState<number[]>([]);
+  const [editingId, setEditingId] = useState<number | null>(null);
+  const [editTitle, setEditTitle] = useState('');
+
+  const inputRef = useRef<HTMLInputElement>(null);
+
+  const showError = (message: string) => {
+    setErrorMessage(message);
+    setTimeout(() => setErrorMessage(''), 3000);
+  };
+
+  useEffect(() => {
+    todoService
+      .getTodos()
+      .then(setTodos)
+      .catch(() => showError('Unable to load todos'));
+  }, []);
+
+  useEffect(() => {
+    if (!isAdding && editingId === null) {
+      inputRef.current?.focus();
+    }
+  }, [todos.length, errorMessage, isAdding, editingId]);
+
+  const completedTodos = useMemo(() => todos.filter(t => t.completed), [todos]);
+  const activeCount = todos.length - completedTodos.length;
+
+  const visibleTodos = useMemo(() => {
+    switch (filter) {
+      case 'active':
+        return todos.filter(t => !t.completed);
+      case 'completed':
+        return todos.filter(t => t.completed);
+      default:
+        return todos;
+    }
+  }, [todos, filter]);
+
+  const toggleTodo = (todo: Todo) => {
+    setLoadingIds(prev => [...prev, todo.id]);
+
+    todoService
+      .updateTodo({
+        ...todo,
+        completed: !todo.completed,
+      })
+      .then(updated => {
+        setTodos(prev => prev.map(t => (t.id === todo.id ? updated : t)));
+      })
+      .catch(() => showError('Unable to update a todo'))
+      .finally(() => {
+        setLoadingIds(prev => prev.filter(id => id !== todo.id));
+      });
+  };
+
+  const removeTodo = (id: number) => {
+    setLoadingIds(prev => [...prev, id]);
+
+    todoService
+      .deleteTodo(id)
+      .then(() => {
+        setTodos(prev => prev.filter(t => t.id !== id));
+      })
+      .catch(() => showError('Unable to delete a todo'))
+      .finally(() => {
+        setLoadingIds(prev => prev.filter(x => x !== id));
+      });
+  };
+
+  const updateTitle = (todo: Todo) => {
+    const trimmedTitle = editTitle.trim();
+
+    if (trimmedTitle === todo.title) {
+      setEditingId(null);
+
+      return;
+    }
+
+    if (!trimmedTitle) {
+      removeTodo(todo.id);
+
+      return;
+    }
+
+    setLoadingIds(prev => [...prev, todo.id]);
+
+    todoService
+      .updateTodo({ ...todo, title: trimmedTitle })
+      .then(updated => {
+        setTodos(prev => prev.map(t => (t.id === todo.id ? updated : t)));
+        setEditingId(null);
+      })
+      .catch(() => showError('Unable to update a todo'))
+      .finally(() => {
+        setLoadingIds(prev => prev.filter(id => id !== todo.id));
+      });
+  };
+
+  const toggleAll = () => {
+    const newStatus = activeCount > 0;
+    const todosToUpdate = todos.filter(t => t.completed !== newStatus);
+
+    todosToUpdate.forEach(toggleTodo);
+  };
+
+  const clearCompleted = () => {
+    completedTodos.forEach(todo => removeTodo(todo.id));
+  };
+
+  const handleSubmit = (e: React.FormEvent) => {
+    e.preventDefault();
+    const trimmed = newTitle.trim();
+
+    if (!trimmed) {
+      showError('Title should not be empty');
+
+      return;
+    }
+
+    setIsAdding(true);
+
+    todoService
+      .createTodo({
+        title: trimmed,
+        completed: false,
+        userId: USER_ID,
+      })
+      .then(created => {
+        setTodos(prev => [...prev, created]);
+        setNewTitle('');
+      })
+      .catch(() => showError('Unable to add a todo'))
+      .finally(() => setIsAdding(false));
+  };
+
   if (!USER_ID) {
     return <UserWarning />;
   }
 
   return (
-    <section className="section container">
-      <p className="title is-4">
-        Copy all you need from the prev task:
-        <br />
-        <a href="https://github.com/mate-academy/react_todo-app-add-and-delete#react-todo-app-add-and-delete">
-          React Todo App - Add and Delete
-        </a>
-      </p>
-
-      <p className="subtitle">Styles are already copied</p>
-    </section>
+    <div className="todoapp">
+      <h1 className="todoapp__title">todos</h1>
+
+      <div className="todoapp__content">
+        <header className="todoapp__header">
+          {todos.length > 0 && (
+            <button
+              type="button"
+              className={classNames('todoapp__toggle-all', {
+                active: activeCount === 0,
+              })}
+              aria-label="Toggle all todos"
+              data-cy="ToggleAllButton"
+              onClick={toggleAll}
+            />
+          )}
+
+          <form onSubmit={handleSubmit}>
+            <input
+              data-cy="NewTodoField"
+              className="todoapp__new-todo"
+              placeholder="What needs to be done?"
+              aria-label="New todo title"
+              ref={inputRef}
+              value={newTitle}
+              onChange={e => setNewTitle(e.target.value)}
+              disabled={isAdding}
+            />
+          </form>
+        </header>
+
+        <section className="todoapp__main" data-cy="TodoList">
+          {visibleTodos.map(todo => {
+            const isLoading = loadingIds.includes(todo.id);
+            const isEditing = editingId === todo.id;
+            const todoId = `todo-status-${todo.id}`;
+
+            return (
+              <div
+                key={todo.id}
+                data-cy="Todo"
+                className={classNames('todo', {
+                  completed: todo.completed,
+                  editing: isEditing,
+                })}
+              >
+                <label className="todo__status-label" htmlFor={todoId}>
+                  <input
+                    id={todoId}
+                    data-cy="TodoStatus"
+                    type="checkbox"
+                    className="todo__status"
+                    checked={todo.completed}
+                    onChange={() => toggleTodo(todo)}
+                    aria-label="Toggle todo status"
+                  />
+                </label>
+
+                {isEditing ? (
+                  <form
+                    onSubmit={e => {
+                      e.preventDefault();
+                      updateTitle(todo);
+                    }}
+                  >
+                    <input
+                      autoFocus
+                      data-cy="TodoTitleField"
+                      className="todo__title-field"
+                      aria-label="Edit todo title"
+                      value={editTitle}
+                      onChange={e => setEditTitle(e.target.value)}
+                      onBlur={() => updateTitle(todo)}
+                      onKeyUp={e => {
+                        if (e.key === 'Escape') {
+                          setEditingId(null);
+                        }
+                      }}
+                    />
+                  </form>
+                ) : (
+                  <>
+                    <span
+                      data-cy="TodoTitle"
+                      className="todo__title"
+                      onDoubleClick={() => {
+                        setEditingId(todo.id);
+                        setEditTitle(todo.title);
+                      }}
+                    >
+                      {todo.title}
+                    </span>
+                    <button
+                      type="button"
+                      className="todo__remove"
+                      data-cy="TodoDelete"
+                      aria-label="Delete todo"
+                      onClick={() => removeTodo(todo.id)}
+                    >
+                      ×
+                    </button>
+                  </>
+                )}
+
+                <div
+                  data-cy="TodoLoader"
+                  className={classNames('modal overlay', {
+                    'is-active': isLoading,
+                  })}
+                >
+                  <div className="modal-background has-background-white-ter" />
+                  <div className="loader" />
+                </div>
+              </div>
+            );
+          })}
+
+          {isAdding && (
+            <div data-cy="Todo" className="todo">
+              <label className="todo__status-label">
+                <input
+                  type="checkbox"
+                  className="todo__status"
+                  disabled
+                  aria-label="Toggle status"
+                />
+              </label>
+              <span data-cy="TodoTitle" className="todo__title">
+                {newTitle}
+              </span>
+              <div data-cy="TodoLoader" className="modal overlay is-active">
+                <div className="modal-background has-background-white-ter" />
+                <div className="loader" />
+              </div>
+            </div>
+          )}
+        </section>
+
+        {todos.length > 0 && (
+          <footer className="todoapp__footer" data-cy="Footer">
+            <span className="todo-count" data-cy="TodosCounter">
+              {activeCount} items left
+            </span>
+
+            <nav className="filter" data-cy="Filter">
+              <a
+                href="#/"
+                data-cy="FilterLinkAll"
+                className={classNames('filter__link', {
+                  selected: filter === 'all',
+                })}
+                onClick={() => setFilter('all')}
+              >
+                All
+              </a>
+              <a
+                href="#/active"
+                data-cy="FilterLinkActive"
+                className={classNames('filter__link', {
+                  selected: filter === 'active',
+                })}
+                onClick={() => setFilter('active')}
+              >
+                Active
+              </a>
+              <a
+                href="#/completed"
+                data-cy="FilterLinkCompleted"
+                className={classNames('filter__link', {
+                  selected: filter === 'completed',
+                })}
+                onClick={() => setFilter('completed')}
+              >
+                Completed
+              </a>
+            </nav>
+
+            <button
+              type="button"
+              className="todoapp__clear-completed"
+              data-cy="ClearCompletedButton"
+              onClick={clearCompleted}
+              disabled={completedTodos.length === 0}
+            >
+              Clear completed
+            </button>
+          </footer>
+        )}
+      </div>
+
+      <div
+        data-cy="ErrorNotification"
+        className={classNames(
+          'notification is-danger is-light has-text-weight-normal',
+          { hidden: !errorMessage },
+        )}
+      >
+        <button
+          type="button"
+          data-cy="HideErrorButton"
+          className="delete"
+          aria-label="Hide notification"
+          onClick={() => setErrorMessage('')}
+        />
+        {errorMessage}
+      </div>
+    </div>
   );
 };
diff --git a/src/api/todos.ts b/src/api/todos.ts
new file mode 100644
index 0000000000..d7200b3dc5
--- /dev/null
+++ b/src/api/todos.ts
@@ -0,0 +1,20 @@
+import { Todo } from '../types/Todo';
+import { client } from '../utils/fetchClient';
+
+export const USER_ID = 1;
+
+export const getTodos = () => {
+  return client.get<Todo[]>(`/todos?userId=${USER_ID}`);
+};
+
+export const createTodo = (data: Omit<Todo, 'id'>) => {
+  return client.post<Todo>('/todos', data);
+};
+
+export const deleteTodo = (todoId: number) => {
+  return client.delete(`/todos/${todoId}`);
+};
+
+export const updateTodo = ({ id, ...data }: Todo) => {
+  return client.patch<Todo>(`/todos/${id}`, data);
+};
diff --git a/src/components/ErrorNotification.tsx b/src/components/ErrorNotification.tsx
new file mode 100644
index 0000000000..1e6bc8fadb
--- /dev/null
+++ b/src/components/ErrorNotification.tsx
@@ -0,0 +1,27 @@
+import React from 'react';
+import classNames from 'classnames';
+import { ErrorMessage } from '../types/ErrorMessage';
+
+interface Props {
+  error: ErrorMessage;
+  onClose: () => void;
+}
+
+export const ErrorNotification: React.FC<Props> = ({ error, onClose }) => (
+  <div
+    data-cy="ErrorNotification"
+    className={classNames(
+      'notification is-danger is-light has-text-weight-normal',
+      { hidden: !error },
+    )}
+  >
+    <button
+      data-cy="HideErrorButton"
+      type="button"
+      className="delete"
+      onClick={onClose}
+      aria-label="Close error notification"
+    />
+    {error}
+  </div>
+);
diff --git a/src/components/Footer.tsx b/src/components/Footer.tsx
new file mode 100644
index 0000000000..3e3f14f3f0
--- /dev/null
+++ b/src/components/Footer.tsx
@@ -0,0 +1,52 @@
+import React from 'react';
+import classNames from 'classnames';
+import { FilterStatus } from '../types/FilterStatus';
+
+interface Props {
+  activeCount: number;
+  filter: FilterStatus;
+  setFilter: (f: FilterStatus) => void;
+  hasCompleted: boolean;
+  onClearCompleted: () => void;
+}
+
+export const Footer: React.FC<Props> = ({
+  activeCount,
+  filter,
+  setFilter,
+  hasCompleted,
+  onClearCompleted,
+}) => (
+  <footer className="todoapp__footer" data-cy="Footer">
+    <span className="todo-count" data-cy="TodosCounter">
+      {activeCount} items left
+    </span>
+
+    <nav className="filter" data-cy="Filter">
+      {(['all', 'active', 'completed'] as const).map(f => (
+        <a
+          key={f}
+          href={`#/${f === 'all' ? '' : f}`}
+          className={classNames('filter__link', { selected: filter === f })}
+          onClick={e => {
+            e.preventDefault();
+            setFilter(f);
+          }}
+          data-cy={`FilterLink${f.charAt(0).toUpperCase() + f.slice(1)}`}
+        >
+          {f.charAt(0).toUpperCase() + f.slice(1)}
+        </a>
+      ))}
+    </nav>
+
+    <button
+      type="button"
+      className="todoapp__clear-completed"
+      data-cy="ClearCompletedButton"
+      disabled={!hasCompleted}
+      onClick={onClearCompleted}
+    >
+      Clear completed
+    </button>
+  </footer>
+);
diff --git a/src/components/Header.tsx b/src/components/Header.tsx
new file mode 100644
index 0000000000..4d36062a61
--- /dev/null
+++ b/src/components/Header.tsx
@@ -0,0 +1,52 @@
+import React from 'react';
+import classNames from 'classnames';
+
+interface Props {
+  newTitle: string;
+  setNewTitle: (value: string) => void;
+  onSubmit: (e: React.FormEvent) => void;
+  isAdding: boolean;
+  todosCount: number;
+  activeCount: number;
+  inputRef: React.RefObject<HTMLInputElement>;
+  onToggleAll: () => void;
+}
+
+export const Header: React.FC<Props> = ({
+  newTitle,
+  setNewTitle,
+  onSubmit,
+  isAdding,
+  todosCount,
+  activeCount,
+  inputRef,
+  onToggleAll,
+}) => (
+  <header className="todoapp__header">
+    <h1 className="todoapp__title">todos</h1>
+
+    {todosCount > 0 && (
+      <button
+        type="button"
+        className={classNames('todoapp__toggle-all', {
+          active: activeCount === 0,
+        })}
+        onClick={onToggleAll}
+        data-cy="ToggleAllButton"
+      />
+    )}
+
+    <form onSubmit={onSubmit}>
+      <input
+        ref={inputRef}
+        data-cy="NewTodoField"
+        type="text"
+        className="todoapp__new-todo"
+        placeholder="What needs to be done?"
+        value={newTitle}
+        onChange={e => setNewTitle(e.target.value)}
+        disabled={isAdding}
+      />
+    </form>
+  </header>
+);
diff --git a/src/components/TodoItem.tsx b/src/components/TodoItem.tsx
new file mode 100644
index 0000000000..81715f1a8a
--- /dev/null
+++ b/src/components/TodoItem.tsx
@@ -0,0 +1,121 @@
+/* eslint-disable jsx-a11y/label-has-associated-control */
+/* eslint-disable jsx-a11y/control-has-associated-label */
+import React, { useState, useEffect, useRef } from 'react';
+import classNames from 'classnames';
+import { Todo } from '../types/Todo';
+
+interface Props {
+  todo: Todo;
+  isLoading?: boolean;
+  onDelete: (id: number) => void;
+  onUpdate: (data: Partial<Todo>) => Promise<void>;
+}
+
+export const TodoItem: React.FC<Props> = ({
+  todo,
+  isLoading = false,
+  onDelete,
+  onUpdate,
+}) => {
+  const [isEditing, setIsEditing] = useState(false);
+  const [newTitle, setNewTitle] = useState(todo.title);
+  const editInputRef = useRef<HTMLInputElement>(null);
+
+  useEffect(() => {
+    if (isEditing) {
+      editInputRef.current?.focus();
+    }
+  }, [isEditing]);
+
+  const handleSubmit = async (e?: React.FormEvent) => {
+    e?.preventDefault();
+    const trimmedTitle = newTitle.trim();
+
+    if (trimmedTitle === todo.title) {
+      setIsEditing(false);
+
+      return;
+    }
+
+    if (!trimmedTitle) {
+      onDelete(todo.id);
+
+      return;
+    }
+
+    try {
+      await onUpdate({ id: todo.id, title: trimmedTitle });
+      setIsEditing(false);
+    } catch {
+      editInputRef.current?.focus();
+    }
+  };
+
+  const handleKeyUp = (e: React.KeyboardEvent) => {
+    if (e.key === 'Escape') {
+      setIsEditing(false);
+      setNewTitle(todo.title);
+    }
+  };
+
+  return (
+    <div
+      data-cy="Todo"
+      className={classNames('todo', { completed: todo.completed })}
+    >
+      <label className="todo__status-label">
+        <input
+          data-cy="TodoStatus"
+          type="checkbox"
+          className="todo__status"
+          checked={todo.completed}
+          disabled={isLoading}
+          onChange={() => onUpdate({ id: todo.id, completed: !todo.completed })}
+        />
+      </label>
+
+      {isEditing ? (
+        <form onSubmit={handleSubmit}>
+          <input
+            data-cy="TodoTitleField"
+            type="text"
+            className="todo__title-field"
+            ref={editInputRef}
+            value={newTitle}
+            disabled={isLoading}
+            onChange={e => setNewTitle(e.target.value)}
+            onBlur={handleSubmit}
+            onKeyUp={handleKeyUp}
+          />
+        </form>
+      ) : (
+        <>
+          <span
+            data-cy="TodoTitle"
+            className="todo__title"
+            onDoubleClick={() => setIsEditing(true)}
+          >
+            {todo.title}
+          </span>
+          <button
+            type="button"
+            className="todo__remove"
+            data-cy="TodoDelete"
+            disabled={isLoading}
+            onClick={() => onDelete(todo.id)}
+          >
+            ×
+          </button>
+        </>
+      )}
+
+      <div
+        data-cy="TodoLoader"
+        className={classNames('modal overlay', { 'is-active': isLoading })}
+      >
+        <div className="modal-background has-background-white-ter" />
+        <div className="loader" />
+      </div>
+    </div>
+  );
+};
diff --git a/src/components/TodoList.tsx b/src/components/TodoList.tsx
new file mode 100644
index 0000000000..f738a77c0b
--- /dev/null
+++ b/src/components/TodoList.tsx
@@ -0,0 +1,40 @@
+import React from 'react';
+import { Todo } from '../types/Todo';
+import { TodoItem } from './TodoItem';
+
+interface Props {
+  todos: Todo[];
+  tempTodo: Todo | null;
+  loadingIds: number[];
+  onDelete: (id: number) => void;
+  onUpdate: (data: Partial<Todo>) => Promise<void>;
+}
+
+export const TodoList: React.FC<Props> = ({
+  todos,
+  tempTodo,
+  loadingIds,
+  onDelete,
+  onUpdate,
+}) => (
+  <section className="todoapp__main" data-cy="TodoList">
+    {todos.map(todo => (
+      <TodoItem
+        key={todo.id}
+        todo={todo}
+        isLoading={loadingIds.includes(todo.id)}
+        onDelete={onDelete}
+        onUpdate={onUpdate}
+      />
+    ))}
+
+    {tempTodo && (
+      <TodoItem
+        todo={tempTodo}
+        isLoading={true}
+        onDelete={() => {}}
+        onUpdate={async () => {}}
+      />
+    )}
+  </section>
+);
diff --git a/src/types/ErrorMessage.ts b/src/types/ErrorMessage.ts
new file mode 100644
index 0000000000..c19681b35e
--- /dev/null
+++ b/src/types/ErrorMessage.ts
@@ -0,0 +1,8 @@
+export enum ErrorMessage {
+  NONE = '',
+  UNABLE_TO_LOAD = 'Unable to load todos',
+  EMPTY_TITLE = 'Title should not be empty',
+  UNABLE_TO_ADD = 'Unable to add a todo',
+  UNABLE_TO_DELETE = 'Unable to delete a todo',
+  UNABLE_TO_UPDATE = 'Unable to update a todo',
+}
diff --git a/src/types/FilterStatus.ts b/src/types/FilterStatus.ts
new file mode 100644
index 0000000000..df729538c3
--- /dev/null
+++ b/src/types/FilterStatus.ts
@@ -0,0 +1 @@
+export type FilterStatus = 'all' | 'active' | 'completed';
diff --git a/src/types/Todo.ts b/src/types/Todo.ts
new file mode 100644
index 0000000000..3f52a5fdde
--- /dev/null
+++ b/src/types/Todo.ts
@@ -0,0 +1,6 @@
+export interface Todo {
+  id: number;
+  userId: number;
+  title: string;
+  completed: boolean;
+}
diff --git a/src/utils/fetchClient.ts b/src/utils/fetchClient.ts
new file mode 100644
index 0000000000..982fb72807
--- /dev/null
+++ b/src/utils/fetchClient.ts
@@ -0,0 +1,41 @@
+const BASE_URL = 'https://mate.academy/students-api';
+
+type RequestMethod = 'GET' | 'POST' | 'PATCH' | 'DELETE';
+
+function wait(delay: number) {
+  return new Promise(resolve => {
+    setTimeout(resolve, delay);
+  });
+}
+
+function request<T>(
+  url: string,
+  method: RequestMethod = 'GET',
+  data: unknown = null,
+): Promise<T> {
+  const options: RequestInit = { method };
+
+  if (data) {
+    options.body = JSON.stringify(data);
+    options.headers = {
+      'Content-Type': 'application/json; charset=utf-8',
+    };
+  }
+
+  return wait(300)
+    .then(() => fetch(BASE_URL + url, options))
+    .then(response => {
+      if (!response.ok) {
+        throw new Error();
+      }
+
+      return response.json();
+    });
+}
+
+export const client = {
+  get: <T>(url: string) => request<T>(url),
+  post: <T>(url: string, data: unknown) => request<T>(url, 'POST', data),
+  patch: <T>(url: string, data: unknown) => request<T>(url, 'PATCH', data),
+  delete: (url: string) => request(url, 'DELETE'),
+};