diff --git a/src/App.tsx b/src/App.tsx
index 81e011f432..0178c1ba6b 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -1,26 +1,252 @@
 /* eslint-disable max-len */
 /* eslint-disable jsx-a11y/control-has-associated-label */
-import React from 'react';
+/* eslint-disable jsx-a11y/label-has-associated-control */
+/* eslint-disable jsx-a11y/control-has-associated-label */
+import React, { useEffect, useRef, useState } from 'react';
 import { UserWarning } from './UserWarning';
-
-const USER_ID = 0;
+import * as postService from './api/todos';
+import { Todo } from './Types/Todo';
+import { TodoFooter } from './Components/Footer/TodoFooter';
+import { TodoItem } from './Components/TodoItem/TodoItem';
+import { ErrorNotification } from './Components/Errors/ErrorNotification';
+import { ErrorType, FilterStatus } from './Types/Types';
+import { CSSTransition, TransitionGroup } from 'react-transition-group';
 
 export const App: React.FC = () => {
-  if (!USER_ID) {
+  const [todos, setTodos] = useState<Todo[]>([]);
+  const [loading, setLoading] = useState(true);
+  const [errorMessage, setErrorMessage] = useState<ErrorType | ''>('');
+  const [filterStatus, setFilterStatus] = useState<FilterStatus>(
+    FilterStatus.All,
+  );
+  const [newTodoTask, setNewTodoTask] = useState('');
+  const [isSubmitting, setIsSubmitting] = useState(false);
+  const [tempTodo, setTempTodo] = useState<Todo | null>(null);
+  const [isProcessing, setIsProcessing] = useState<number[]>([]);
+
+  const visibleTodos = todos.filter(todo => {
+    if (filterStatus === FilterStatus.Active) {
+      return !todo.completed;
+    }
+
+    if (filterStatus === FilterStatus.Completed) {
+      return todo.completed;
+    }
+
+    return true;
+  });
+
+  const isAllCompleted =
+    todos.length > 0 && todos.every(todo => todo.completed);
+  const activeCount = todos.filter(todo => !todo.completed).length;
+  const hasCompleted = todos.some(todo => todo.completed);
+
+  function loadTodos() {
+    setLoading(true);
+
+    postService
+      .getTodos()
+      .then(setTodos)
+      .catch(() => setErrorMessage(ErrorType.Load))
+      .finally(() => setLoading(false));
+  }
+
+  useEffect(loadTodos, []);
+
+  const handleTaskChange = (event: React.ChangeEvent<HTMLInputElement>) => {
+    setNewTodoTask(event.target.value);
+    setErrorMessage('');
+  };
+
+  const handleSubmit = (event: React.FormEvent) => {
+    event.preventDefault();
+    const trimSpacesTitle = newTodoTask.trim();
+
+    if (!trimSpacesTitle) {
+      setErrorMessage(ErrorType.EmptyTitle);
+
+      return;
+    }
+
+    setIsSubmitting(true);
+
+    const newTempTodo: Todo = {
+      id: 0,
+      title: trimSpacesTitle,
+      userId: postService.USER_ID,
+      completed: false,
+    };
+
+    setTempTodo(newTempTodo);
+
+    postService
+      .createTodo({
+        title: trimSpacesTitle,
+        userId: postService.USER_ID,
+        completed: false,
+      })
+
+      .then(newTodo => {
+        setTodos(currentTodo => [...currentTodo, newTodo]);
+        setNewTodoTask('');
+      })
+      .catch(() => setErrorMessage(ErrorType.Add))
+      .finally(() => {
+        setTempTodo(null);
+        setIsSubmitting(false);
+      });
+  };
+
+  const field = useRef<HTMLInputElement>(null);
+
+  useEffect(() => {
+    if (!isSubmitting && !loading && isProcessing.length === 0) {
+      const timeoutId = setTimeout(() => {
+        field.current?.focus();
+      }, 50);
+
+      return () => clearTimeout(timeoutId);
+    }
+
+    return undefined;
+  }, [isSubmitting, loading, isProcessing]);
+
+  async function deleteItem(todoId: number) {
+    setLoading(true);
+    setIsProcessing(current => [...current, todoId]);
+    try {
+      await postService.deleteTodo(todoId);
+
+      setTodos(currentItem => currentItem.filter(todo => todo.id !== todoId));
+    } catch (error) {
+      setErrorMessage(ErrorType.Delete);
+      throw error;
+    } finally {
+      setIsProcessing(current => current.filter(id => id !== todoId));
+      setLoading(false);
+    }
+  }
+
+  const clearCompleted = () => {
+    const completedIds = todos.filter(todo => todo.completed);
+
+    const deletePromises = completedIds.map(todo => {
+      return deleteItem(todo.id);
+    });
+
+    Promise.all(deletePromises)
+      .then(() => {
+        setTodos(prev => prev.filter(t => !t.completed));
+      })
+      .catch(() => setErrorMessage(ErrorType.Delete));
+  };
+
+  async function handleUpdate(todoId: number, data: Partial<Todo>) {
+    setIsProcessing(current => [...current, todoId]);
+    try {
+      try {
+        const updatedTodo = await postService.updateTodo(todoId, data);
+
+        setTodos(prev =>
+          prev.map(todo => (todo.id === todoId ? updatedTodo : todo)),
+        );
+      } catch (error) {
+        setErrorMessage(ErrorType.Update);
+        throw error;
+      }
+    } finally {
+      setIsProcessing(current_1 => current_1.filter(id => id !== todoId));
+    }
+  }
+
+  const toggleAll = () => {
+    const shouldCompleteAll = !isAllCompleted;
+    const todosToUpdate = todos.filter(
+      todo => todo.completed !== shouldCompleteAll,
+    );
+
+    const updatedTodos = todosToUpdate.map(todo => {
+      return handleUpdate(todo.id, { completed: shouldCompleteAll });
+    });
+
+    Promise.all(updatedTodos).catch(() => {
+      setErrorMessage(ErrorType.Update);
+    });
+  };
+
+  if (!postService.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={`todoapp__toggle-all ${isAllCompleted ? 'active' : ''}`}
+              data-cy="ToggleAllButton"
+              onClick={toggleAll}
+            />
+          )}
+          <form onSubmit={handleSubmit}>
+            <input
+              ref={field}
+              data-cy="NewTodoField"
+              type="text"
+              className="todoapp__new-todo"
+              placeholder="What needs to be done?"
+              value={newTodoTask}
+              onChange={handleTaskChange}
+              disabled={isSubmitting}
+            />
+          </form>
+        </header>
+
+        <section className="todoapp__main" data-cy="TodoList">
+          <TransitionGroup>
+            {visibleTodos.map(todo => (
+              <CSSTransition key={todo.id} timeout={300} classNames="item">
+                <TodoItem
+                  key={todo.id}
+                  todo={todo}
+                  onDelete={deleteItem}
+                  isLoading={isProcessing.includes(todo.id)}
+                  updateTodo={handleUpdate}
+                />
+              </CSSTransition>
+            ))}
+            {tempTodo && (
+              <CSSTransition key={0} timeout={300} classNames="temp-item">
+                <TodoItem
+                  todo={tempTodo}
+                  onDelete={() => {}}
+                  isLoading={true}
+                  updateTodo={() => Promise.resolve()}
+                />
+              </CSSTransition>
+            )}
+          </TransitionGroup>
+        </section>
+
+        {todos.length > 0 && (
+          <TodoFooter
+            activeCount={activeCount}
+            filterStatus={filterStatus}
+            hasCompleted={hasCompleted}
+            onFilterChange={setFilterStatus}
+            onClearCompleted={clearCompleted}
+          />
+        )}
+
+        <ErrorNotification
+          message={errorMessage}
+          onClose={() => setErrorMessage('')}
+        />
+      </div>
+    </div>
   );
 };
diff --git a/src/Components/Errors/ErrorNotification.tsx b/src/Components/Errors/ErrorNotification.tsx
new file mode 100644
index 0000000000..005513d08c
--- /dev/null
+++ b/src/Components/Errors/ErrorNotification.tsx
@@ -0,0 +1,34 @@
+import { useEffect } from 'react';
+
+type Props = {
+  message: string;
+  onClose: () => void;
+};
+
+export const ErrorNotification: React.FC<Props> = ({ message, onClose }) => {
+  useEffect(() => {
+    if (!message) {
+      return;
+    }
+
+    const timer = setTimeout(onClose, 3000);
+
+    return () => clearTimeout(timer);
+  }, [message, onClose]);
+
+  return (
+    <div
+      data-cy="ErrorNotification"
+      className={`notification is-danger is-light has-text-weight-normal ${!message ? 'hidden' : ''}`}
+      hidden={!message}
+    >
+      <button
+        data-cy="HideErrorButton"
+        type="button"
+        className="delete"
+        onClick={onClose}
+      />
+      {message}
+    </div>
+  );
+};
diff --git a/src/Components/Footer/TodoFooter.tsx b/src/Components/Footer/TodoFooter.tsx
new file mode 100644
index 0000000000..6268fedf53
--- /dev/null
+++ b/src/Components/Footer/TodoFooter.tsx
@@ -0,0 +1,53 @@
+import React from 'react';
+import '../../styles/todoapp.scss';
+import { FilterStatus } from '../../Types/Types';
+
+type Props = {
+  activeCount: number;
+  hasCompleted: boolean;
+  filterStatus: FilterStatus;
+  onFilterChange: (status: FilterStatus) => void;
+  onClearCompleted: () => void;
+};
+
+export const TodoFooter: React.FC<Props> = ({
+  activeCount,
+  hasCompleted,
+  filterStatus,
+  onFilterChange,
+  onClearCompleted,
+}) => {
+  return (
+    <footer className="todoapp__footer" data-cy="Footer">
+      <span className="todo-count" data-cy="TodosCounter">
+        {activeCount} items left
+      </span>
+
+      <nav className="filter" data-cy="Filter">
+        {Object.values(FilterStatus).map(status => (
+          <a
+            key={status}
+            href={`#/${status === 'all' ? '' : status}`}
+            className={`filter__link ${filterStatus === status ? 'selected' : ''}`}
+            data-cy={`FilterLink${status.charAt(0).toUpperCase() + status.slice(1)}`}
+            onClick={() => {
+              onFilterChange(status);
+            }}
+          >
+            {status.charAt(0).toUpperCase() + status.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/Loader/Loader.tsx b/src/Components/Loader/Loader.tsx
new file mode 100644
index 0000000000..4ffab630ab
--- /dev/null
+++ b/src/Components/Loader/Loader.tsx
@@ -0,0 +1,16 @@
+import React from 'react';
+type Props = {
+  isLoading?: boolean;
+};
+
+export const Loader: React.FC<Props> = ({ isLoading = true }) => {
+  return (
+    <div
+      data-cy="TodoLoader"
+      className={`modal overlay ${isLoading ? 'is-active' : ''}`}
+    >
+      <div className="modal-background has-background-white-ter" />
+      <div className="loader" />
+    </div>
+  );
+};
diff --git a/src/Components/TodoItem/TodoItem.tsx b/src/Components/TodoItem/TodoItem.tsx
new file mode 100644
index 0000000000..f54e839274
--- /dev/null
+++ b/src/Components/TodoItem/TodoItem.tsx
@@ -0,0 +1,111 @@
+import { useEffect, useRef, useState } from 'react';
+import { Todo } from '../../Types/Todo';
+import '../../styles/todo.scss';
+import { Loader } from '../Loader/Loader';
+
+type Props = {
+  todo: Todo;
+  onDelete: (todoId: number) => void;
+  isLoading?: boolean;
+  updateTodo: (todoId: number, data: Partial<Todo>) => Promise<void>;
+};
+
+export const TodoItem: React.FC<Props> = ({
+  todo,
+  onDelete,
+  isLoading = false,
+  updateTodo,
+}) => {
+  const [isEditing, setIsEditing] = useState(false);
+  const [newTitle, setNewTitle] = useState(todo.title);
+
+  const field = useRef<HTMLInputElement>(null);
+
+  useEffect(() => {
+    if (isEditing && field.current) {
+      field.current.focus();
+    }
+  }, [isEditing]);
+
+  const handleSubmit = (e: React.FormEvent) => {
+    e.preventDefault();
+    const trimmedTitle = newTitle.trim();
+
+    if (trimmedTitle === todo.title) {
+      setIsEditing(false);
+
+      return;
+    }
+
+    if (!trimmedTitle) {
+      onDelete(todo.id);
+
+      return;
+    }
+
+    updateTodo(todo.id, { title: trimmedTitle })
+      .then(() => {
+        setIsEditing(false);
+      })
+      .catch(() => {});
+  };
+
+  const handleKeyUp = (e: React.KeyboardEvent) => {
+    if (e.key === 'Escape') {
+      setNewTitle(todo.title);
+      setIsEditing(false);
+    }
+  };
+
+  return (
+    <div data-cy="Todo" className={`todo ${todo.completed ? 'completed' : ''}`}>
+      <label className="todo__status-label" htmlFor={`todo-status-${todo.id}`}>
+        <input
+          id={`todo-status-${todo.id}`}
+          data-cy="TodoStatus"
+          type="checkbox"
+          className="todo__status"
+          checked={todo.completed}
+          aria-label={`Статус справи: ${todo.title}`}
+          onChange={() => updateTodo(todo.id, { completed: !todo.completed })}
+        />
+      </label>
+
+      {isEditing ? (
+        <form onSubmit={handleSubmit}>
+          <input
+            ref={field}
+            data-cy="TodoTitleField"
+            type="text"
+            className="todo__title-field"
+            value={newTitle}
+            onChange={e => setNewTitle(e.target.value)}
+            onBlur={handleSubmit}
+            onKeyUp={handleKeyUp}
+          />
+        </form>
+      ) : (
+        <span
+          data-cy="TodoTitle"
+          className="todo__title"
+          onDoubleClick={() => setIsEditing(true)}
+        >
+          {todo.title}
+        </span>
+      )}
+
+      {!isEditing && (
+        <button
+          type="button"
+          className="todo__remove"
+          data-cy="TodoDelete"
+          onClick={() => onDelete(todo.id)}
+          disabled={isLoading}
+        >
+          ×
+        </button>
+      )}
+      <Loader isLoading={isLoading} />
+    </div>
+  );
+};
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/Types/Types.ts b/src/Types/Types.ts
new file mode 100644
index 0000000000..2b9924d30d
--- /dev/null
+++ b/src/Types/Types.ts
@@ -0,0 +1,13 @@
+export enum FilterStatus {
+  All = 'all',
+  Active = 'active',
+  Completed = 'completed',
+}
+
+export enum ErrorType {
+  Load = 'Unable to load todos',
+  EmptyTitle = 'Title should not be empty',
+  Add = 'Unable to add a todo',
+  Delete = 'Unable to delete a todo',
+  Update = 'Unable to update a todo',
+}
diff --git a/src/api/todos.ts b/src/api/todos.ts
new file mode 100644
index 0000000000..e3fa5353bf
--- /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 = 4109;
+
+export const getTodos = () => {
+  return client.get<Todo[]>(`/todos?userId=${USER_ID}`);
+};
+
+export const createTodo = ({ title, userId, completed }: Omit<Todo, 'id'>) => {
+  return client.post<Todo>(`/todos`, { title, userId, completed });
+};
+
+export const deleteTodo = (todoId: number) => {
+  return client.delete(`/todos/${todoId}`);
+};
+
+export const updateTodo = (todoId: number, data: Partial<Todo>) => {
+  return client.patch<Todo>(`/todos/${todoId}`, data);
+};
diff --git a/src/styles/animations.scss b/src/styles/animations.scss
new file mode 100644
index 0000000000..04f5318372
--- /dev/null
+++ b/src/styles/animations.scss
@@ -0,0 +1,46 @@
+.item-enter {
+  max-height: 0;
+}
+
+.item-enter-active {
+  overflow: hidden;
+  max-height: 58px;
+  transition: max-height 0.3s ease-in-out;
+}
+
+.item-exit {
+  max-height: 58px;
+}
+
+.item-exit-active {
+  overflow: hidden;
+  max-height: 0;
+  transition: max-height 0.3s ease-in-out;
+}
+
+.temp-item-enter {
+  max-height: 0;
+}
+
+.temp-item-enter-active {
+  overflow: hidden;
+  max-height: 58px;
+  transition: max-height 0.3s ease-in-out;
+}
+
+.temp-item-exit {
+  max-height: 58px;
+}
+
+.temp-item-exit-active {
+  transform: translateY(-58px);
+  max-height: 0;
+  opacity: 0;
+  transition: 0.3s ease-in-out;
+  transition-property: opacity, max-height, transform;
+}
+
+.has-error .temp-item-exit-active {
+  transform: translateY(0);
+  overflow: hidden;
+}
diff --git a/src/utils/fetchClient.ts b/src/utils/fetchClient.ts
new file mode 100644
index 0000000000..94e06c36ba
--- /dev/null
+++ b/src/utils/fetchClient.ts
@@ -0,0 +1,46 @@
+/* eslint-disable @typescript-eslint/no-explicit-any */
+const BASE_URL = 'https://mate.academy/students-api';
+
+// returns a promise resolved after a given delay
+function wait(delay: number) {
+  return new Promise(resolve => {
+    setTimeout(resolve, delay);
+  });
+}
+
+// To have autocompletion and avoid mistypes
+type RequestMethod = 'GET' | 'POST' | 'PATCH' | 'DELETE';
+
+function request<T>(
+  url: string,
+  method: RequestMethod = 'GET',
+  data: any = null, // we can send any data to the server
+): Promise<T> {
+  const options: RequestInit = { method };
+
+  if (data) {
+    // We add body and Content-Type only for the requests with data
+    options.body = JSON.stringify(data);
+    options.headers = {
+      'Content-Type': 'application/json; charset=UTF-8',
+    };
+  }
+
+  // DON'T change the delay it is required for tests
+  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: any) => request<T>(url, 'POST', data),
+  patch: <T>(url: string, data: any) => request<T>(url, 'PATCH', data),
+  delete: (url: string) => request(url, 'DELETE'),
+};