diff --git a/README.md b/README.md
index 47a1add059..ca90c07732 100644
--- a/README.md
+++ b/README.md
@@ -47,4 +47,4 @@ Implement the ability to edit a todo title on double click:
 
 - Implement a solution following the [React task guideline](https://github.com/mate-academy/react_task-guideline#react-tasks-guideline).
 - Use the [React TypeScript cheat sheet](https://mate-academy.github.io/fe-program/js/extra/react-typescript).
-- Replace `<your_account>` with your Github username in the [DEMO LINK](https://<your_account>.github.io/react_todo-app-with-api/) and add it to the PR description.
+- Replace `<your_account>` with your Github username in the [DEMO LINK](https://pogorielova.github.io/react_todo-app-with-api/) and add it to the PR description.
diff --git a/src/App.tsx b/src/App.tsx
index 81e011f432..2b36ac433b 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -1,26 +1,193 @@
-/* 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 { UserWarning } from './UserWarning';
-
-const USER_ID = 0;
+import * as todoService from './api/todos';
+import { Todo } from './types/Todo';
+import { Header } from './components/Header';
+import { Footer } from './components/Footer';
+import { ErrorNotification } from './components/ErrorNotification';
+import { TodoItem } from './components/TodoItem';
+import { FilterType } from './types/FilterType';
+import { ErrorTypes } from './types/ErrorTypes';
+import { CSSTransition, TransitionGroup } from 'react-transition-group';
 
 export const App: React.FC = () => {
-  if (!USER_ID) {
+  const [todos, setTodos] = useState<Todo[]>([]);
+  const [errorMessage, setErrorMessage] = useState<ErrorTypes | null>(null);
+  const [filterType, setFilterType] = useState(FilterType.All);
+  const [isSubmitting, setIsSubmitting] = useState(false);
+  const [tempTodo, setTempTodo] = useState<Todo | null>(null);
+  const [loadingTodoIds, setLoadingTodoIds] = useState<number[]>([]);
+  const [editingTodo, setEditingTodo] = useState<number | null>(null);
+
+  const visibleTodos = useMemo(
+    () =>
+      todos.filter(todo => {
+        if (filterType === FilterType.All) {
+          return true;
+        }
+
+        return filterType === FilterType.Completed
+          ? todo.completed
+          : !todo.completed;
+      }),
+    [todos, filterType],
+  );
+
+  const inputField = useRef<HTMLInputElement>(null);
+
+  const isAllCompleted = todos.every(todo => todo.completed);
+  const activeTodos = todos.filter(todo => !todo.completed);
+  const completedTodos = todos.filter(todo => todo.completed);
+
+  const onAddTodo = async (newTodoTitle: string) => {
+    setIsSubmitting(true);
+    setTempTodo({
+      id: 0,
+      title: newTodoTitle,
+      completed: false,
+      userId: todoService.USER_ID,
+    });
+    try {
+      const newTodo = await todoService.addTodo({
+        title: newTodoTitle,
+        completed: false,
+        userId: todoService.USER_ID,
+      });
+
+      setTodos(currentTodos => [...currentTodos, newTodo]);
+    } catch (error) {
+      setErrorMessage(ErrorTypes.Adding);
+      inputField?.current?.focus();
+      throw error;
+    } finally {
+      setIsSubmitting(false);
+      setTempTodo(null);
+    }
+  };
+
+  const onDeleteTodo = async (todoToDelete: number) => {
+    setLoadingTodoIds(prev => [...prev, todoToDelete]);
+    try {
+      await todoService.deleteTodo(todoToDelete);
+      setTodos(prev => prev.filter(todo => todo.id !== todoToDelete));
+    } catch (error) {
+      setErrorMessage(ErrorTypes.Deleting);
+      inputField?.current?.focus();
+      throw error;
+    } finally {
+      setLoadingTodoIds(prev => prev.filter(id => id !== todoToDelete));
+    }
+  };
+
+  const onUpdateTodo = async (todoToUpdate: Todo) => {
+    setLoadingTodoIds(prev => [...prev, todoToUpdate.id]);
+    try {
+      const updated = await todoService.updateTodo(todoToUpdate);
+
+      setTodos(prev =>
+        prev.map(todo => {
+          return todo.id === updated.id ? updated : todo;
+        }),
+      );
+    } catch (error) {
+      setErrorMessage(ErrorTypes.Updating);
+      throw error;
+    } finally {
+      setLoadingTodoIds(prev => prev.filter(id => id !== todoToUpdate.id));
+    }
+  };
+
+  const onToggleAll = async () => {
+    if (activeTodos.length > 0) {
+      activeTodos.forEach(todo => {
+        onUpdateTodo({ ...todo, completed: true });
+      });
+    } else {
+      todos.forEach(todo => {
+        onUpdateTodo({ ...todo, completed: false });
+      });
+    }
+  };
+
+  const onClearCompleted = async () => {
+    const completed = todos.filter(todo => todo.completed);
+
+    completed.forEach(todo => {
+      onDeleteTodo(todo.id);
+    });
+  };
+
+  useEffect(() => {
+    todoService
+      .getTodos()
+      .then(setTodos)
+      .catch(() => {
+        setErrorMessage(ErrorTypes.Loading);
+      });
+  }, []);
+
+  if (!todoService.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
+          isAllCompleted={isAllCompleted}
+          onAddTodo={onAddTodo}
+          isSubmitting={isSubmitting}
+          setErrorMessage={setErrorMessage}
+          todosLength={todos.length}
+          inputField={inputField}
+          onToggleAll={onToggleAll}
+        />
+        <section className="todoapp__main" data-cy="TodoList">
+          <TransitionGroup>
+            {visibleTodos.map((todo: Todo) => (
+              <CSSTransition key={todo.id} timeout={300} classNames="item">
+                <TodoItem
+                  todo={todo}
+                  onDeleteTodo={onDeleteTodo}
+                  onUpdateTodo={onUpdateTodo}
+                  key={todo.id}
+                  isLoading={loadingTodoIds.includes(todo.id)}
+                  isEditing={editingTodo === todo.id}
+                  setEditingTodo={setEditingTodo}
+                />
+              </CSSTransition>
+            ))}
+            {tempTodo && (
+              <CSSTransition key={0} timeout={300} classNames="temp-item">
+                <TodoItem
+                  todo={tempTodo}
+                  onDeleteTodo={onDeleteTodo}
+                  onUpdateTodo={onUpdateTodo}
+                  setEditingTodo={setEditingTodo}
+                  isLoading
+                />
+              </CSSTransition>
+            )}
+          </TransitionGroup>
+        </section>
+
+        {todos.length > 0 && (
+          <Footer
+            activeTodos={activeTodos}
+            completedTodos={completedTodos}
+            filterType={filterType}
+            setFilterType={setFilterType}
+            onClearCompleted={onClearCompleted}
+          />
+        )}
+      </div>
+
+      <ErrorNotification
+        errorMessage={errorMessage}
+        setErrorMessage={setErrorMessage}
+      />
+    </div>
   );
 };
diff --git a/src/api/todos.ts b/src/api/todos.ts
new file mode 100644
index 0000000000..99d4fa09cd
--- /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 = 2139;
+
+export const getTodos = () => {
+  return client.get<Todo[]>(`/todos?userId=${USER_ID}`);
+};
+
+export const deleteTodo = (id: number) => {
+  return client.delete(`/todos/${id}`);
+};
+
+export const addTodo = (newTodo: Omit<Todo, 'id'>) => {
+  return client.post<Todo>(`/todos`, { ...newTodo });
+};
+
+export const updateTodo = (todo: Todo) => {
+  return client.patch<Todo>(`/todos/${todo.id}`, todo);
+};
diff --git a/src/components/ErrorNotification.tsx b/src/components/ErrorNotification.tsx
new file mode 100644
index 0000000000..651c5902de
--- /dev/null
+++ b/src/components/ErrorNotification.tsx
@@ -0,0 +1,45 @@
+import classNames from 'classnames';
+import { ErrorTypes } from '../types/ErrorTypes';
+import { Dispatch, SetStateAction, useEffect } from 'react';
+
+type Props = {
+  errorMessage: ErrorTypes | null;
+  setErrorMessage: Dispatch<SetStateAction<ErrorTypes | null>>;
+};
+
+export const ErrorNotification: React.FC<Props> = ({
+  errorMessage,
+  setErrorMessage,
+}) => {
+  useEffect(() => {
+    if (errorMessage === null) {
+      return;
+    }
+
+    const timerId = setTimeout(() => {
+      setErrorMessage(null);
+    }, 3000);
+
+    return () => {
+      clearTimeout(timerId);
+    };
+  }, [errorMessage, setErrorMessage]);
+
+  return (
+    <div
+      data-cy="ErrorNotification"
+      className={classNames(
+        'notification is-danger is-light has-text-weight-normal',
+        { hidden: errorMessage === null },
+      )}
+    >
+      <button
+        data-cy="HideErrorButton"
+        type="button"
+        className="delete"
+        onClick={() => setErrorMessage(null)}
+      />
+      {errorMessage}
+    </div>
+  );
+};
diff --git a/src/components/Footer.tsx b/src/components/Footer.tsx
new file mode 100644
index 0000000000..d13e7a81f3
--- /dev/null
+++ b/src/components/Footer.tsx
@@ -0,0 +1,53 @@
+import classNames from 'classnames';
+import { FilterType } from '../types/FilterType';
+import { Todo } from '../types/Todo';
+
+type Props = {
+  activeTodos: Todo[];
+  completedTodos: Todo[];
+  filterType: FilterType;
+  setFilterType: (selectedOption: FilterType) => void;
+  onClearCompleted: () => Promise<void>;
+};
+
+export const Footer: React.FC<Props> = ({
+  activeTodos,
+  filterType,
+  completedTodos,
+  setFilterType,
+  onClearCompleted,
+}) => {
+  return (
+    <footer className="todoapp__footer" data-cy="Footer">
+      <span className="todo-count" data-cy="TodosCounter">
+        {activeTodos.length} items left
+      </span>
+
+      <nav className="filter" data-cy="Filter">
+        {Object.values(FilterType).map(filter => (
+          <a
+            href={`#/${filter === FilterType.All ? '' : filter.toLowerCase()}`}
+            key={filter}
+            className={classNames('filter__link', {
+              selected: filterType === filter,
+            })}
+            data-cy={`FilterLink${filter}`}
+            onClick={() => setFilterType(filter)}
+          >
+            {filter}
+          </a>
+        ))}
+      </nav>
+
+      <button
+        type="button"
+        className="todoapp__clear-completed"
+        data-cy="ClearCompletedButton"
+        disabled={!completedTodos.length}
+        onClick={onClearCompleted}
+      >
+        Clear completed
+      </button>
+    </footer>
+  );
+};
diff --git a/src/components/Header.tsx b/src/components/Header.tsx
new file mode 100644
index 0000000000..7274de861d
--- /dev/null
+++ b/src/components/Header.tsx
@@ -0,0 +1,72 @@
+import classNames from 'classnames';
+import { useEffect, useState } from 'react';
+import { ErrorTypes } from '../types/ErrorTypes';
+
+type Props = {
+  isAllCompleted: boolean;
+  onAddTodo: (newTodoTitle: string) => Promise<void>;
+  isSubmitting: boolean;
+  setErrorMessage: (error: ErrorTypes) => void;
+  todosLength: number;
+  inputField: React.RefObject<HTMLInputElement>;
+  onToggleAll: () => void;
+};
+export const Header: React.FC<Props> = ({
+  isAllCompleted,
+  onAddTodo,
+  isSubmitting,
+  setErrorMessage,
+  todosLength,
+  inputField,
+  onToggleAll,
+}) => {
+  const [todoTitle, setTodoTitle] = useState('');
+
+  const onSubmit = async (event: React.FormEvent<HTMLFormElement>) => {
+    event.preventDefault();
+    if (todoTitle.trim() === '') {
+      setErrorMessage(ErrorTypes.Titling);
+
+      return;
+    }
+
+    try {
+      await onAddTodo(todoTitle.trim());
+      setTodoTitle('');
+    } catch (error) {}
+  };
+
+  useEffect(() => {
+    if (inputField.current || !isSubmitting) {
+      inputField?.current?.focus();
+    }
+  }, [inputField, todosLength, isSubmitting]);
+
+  return (
+    <header className="todoapp__header">
+      {todosLength > 0 && (
+        <button
+          type="button"
+          className={classNames('todoapp__toggle-all', {
+            active: isAllCompleted,
+          })}
+          onClick={onToggleAll}
+          data-cy="ToggleAllButton"
+        />
+      )}
+
+      <form onSubmit={onSubmit}>
+        <input
+          disabled={isSubmitting}
+          ref={inputField}
+          data-cy="NewTodoField"
+          type="text"
+          className="todoapp__new-todo"
+          placeholder="What needs to be done?"
+          value={todoTitle}
+          onChange={event => setTodoTitle(event.target.value)}
+        />
+      </form>
+    </header>
+  );
+};
diff --git a/src/components/TodoItem.tsx b/src/components/TodoItem.tsx
new file mode 100644
index 0000000000..b609693379
--- /dev/null
+++ b/src/components/TodoItem.tsx
@@ -0,0 +1,126 @@
+/* eslint-disable jsx-a11y/label-has-associated-control */
+/* eslint-disable jsx-a11y/control-has-associated-label */
+
+import classNames from 'classnames';
+import { Todo } from '../types/Todo';
+import { useRef, useState } from 'react';
+type Props = {
+  todo: Todo;
+  isLoading?: boolean;
+  isEditing?: boolean;
+  onDeleteTodo: (id: number) => Promise<void>;
+  onUpdateTodo: (todo: Todo) => Promise<void>;
+  setEditingTodo: (id: number | null) => void;
+};
+export const TodoItem: React.FC<Props> = ({
+  todo,
+  isLoading,
+  isEditing,
+  onDeleteTodo,
+  onUpdateTodo,
+  setEditingTodo,
+}) => {
+  const [editingTitle, setEditingTitle] = useState(todo.title);
+
+  const inputRef = useRef<HTMLInputElement>(null);
+
+  const onChangeStatus = () => {
+    const toUpdate = { ...todo, completed: !todo.completed };
+
+    onUpdateTodo(toUpdate);
+  };
+
+  const changeTitle = async (event: React.FormEvent<HTMLFormElement>) => {
+    event.preventDefault();
+
+    if (todo.title === editingTitle.trim()) {
+      setEditingTodo(null);
+
+      return;
+    }
+
+    if (editingTitle.trim() === '') {
+      try {
+        await onDeleteTodo(todo.id);
+        setEditingTodo(null);
+      } catch (error) {
+        inputRef?.current?.focus();
+      }
+
+      return;
+    }
+
+    try {
+      await onUpdateTodo({ ...todo, title: editingTitle.trim() });
+      setEditingTodo(null);
+    } catch (error) {
+      inputRef?.current?.focus();
+    }
+  };
+
+  const cancelEditing = (event: React.KeyboardEvent<HTMLInputElement>) => {
+    if (event.key === 'Escape') {
+      setEditingTodo(null);
+      setEditingTitle(todo.title);
+    }
+  };
+
+  return (
+    <div
+      data-cy="Todo"
+      className={classNames('todo', { completed: todo.completed })}
+      key={todo.id}
+    >
+      <label className="todo__status-label">
+        <input
+          data-cy="TodoStatus"
+          type="checkbox"
+          className="todo__status"
+          checked={todo.completed}
+          onChange={onChangeStatus}
+        />
+      </label>
+      {isEditing ? (
+        <form onBlur={changeTitle} onSubmit={changeTitle}>
+          <input
+            autoFocus
+            ref={inputRef}
+            data-cy="TodoTitleField"
+            type="text"
+            className="todo__title-field"
+            placeholder="Empty todo will be deleted"
+            value={editingTitle}
+            onChange={event => setEditingTitle(event.target.value)}
+            onKeyUp={cancelEditing}
+          />
+        </form>
+      ) : (
+        <>
+          <span
+            data-cy="TodoTitle"
+            className="todo__title"
+            onDoubleClick={() => setEditingTodo(todo.id)}
+          >
+            {todo.title}
+          </span>
+          <button
+            type="button"
+            className="todo__remove"
+            data-cy="TodoDelete"
+            onClick={() => onDeleteTodo(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/styles/index.scss b/src/styles/index.scss
index bccd80c8bc..f2f19f4f7f 100644
--- a/src/styles/index.scss
+++ b/src/styles/index.scss
@@ -23,3 +23,50 @@ body {
 @import "./todoapp";
 @import "./todo";
 @import "./filter";
+
+.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/types/ErrorTypes.tsx b/src/types/ErrorTypes.tsx
new file mode 100644
index 0000000000..1ae2eb1146
--- /dev/null
+++ b/src/types/ErrorTypes.tsx
@@ -0,0 +1,7 @@
+export enum ErrorTypes {
+  Loading = 'Unable to load todos',
+  Titling = 'Title should not be empty',
+  Adding = 'Unable to add a todo',
+  Deleting = 'Unable to delete a todo',
+  Updating = 'Unable to update a todo',
+}
diff --git a/src/types/FilterType.ts b/src/types/FilterType.ts
new file mode 100644
index 0000000000..579c7f50ce
--- /dev/null
+++ b/src/types/FilterType.ts
@@ -0,0 +1,5 @@
+export enum FilterType {
+  All = 'All',
+  Active = 'Active',
+  Completed = '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..708ac4c17b
--- /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(100)
+    .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'),
+};