diff --git a/src/App.tsx b/src/App.tsx
index 81e011f43..ba84c8c42 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -1,26 +1,110 @@
-/* eslint-disable max-len */
+/* eslint-disable jsx-a11y/label-has-associated-control */
 /* eslint-disable jsx-a11y/control-has-associated-label */
-import React from 'react';
-import { UserWarning } from './UserWarning';
+import { FC, useEffect, useMemo, useState } from 'react';
 
-const USER_ID = 0;
+import { Todo } from './types/Todo';
+import { Errors } from './types/Errors';
+import { FilterBy } from './types/FilterBy';
 
-export const App: React.FC = () => {
-  if (!USER_ID) {
-    return <UserWarning />;
-  }
+import { getFilteredTodos } from './utils/getFilteredTodos';
+import { handleFetchTodos } from './utils/handleFetchTodos';
+import { handleDeleteTodos } from './utils/handleDeleteTodos';
+
+import { Header, TodoList, Footer, ErrorMessage, TodoItem } from './components';
+import { handleUpdateTodos } from './utils/handleUpdateTodos';
+
+export const App: FC = () => {
+  const [todos, setTodos] = useState<Todo[]>([]);
+  const [tempTodo, setTempTodo] = useState<Todo | null>(null);
+  const [newTodoData, setNewTodoData] = useState<Partial<Todo>>({});
+
+  const [idsForDelete, setIdsForDelete] = useState<number[]>([]);
+  const [idsForUpdate, setIdsForUpdate] = useState<number[]>([]);
+
+  const [error, setError] = useState<Errors>(Errors.DEFAULT);
+
+  const [selectedFilter, setSelectedFilter] = useState<FilterBy>(FilterBy.ALL);
+
+  const completedTodosId = useMemo(() => {
+    return getFilteredTodos(todos, FilterBy.COMPLETED).map(todo => todo.id);
+  }, [todos]);
+
+  const numberOfActiveTodos = useMemo(() => {
+    return getFilteredTodos(todos, FilterBy.ACTIVE).length;
+  }, [todos]);
+
+  const filteredTodos = useMemo(() => {
+    return getFilteredTodos(todos, selectedFilter);
+  }, [todos, selectedFilter]);
+
+  useEffect(() => {
+    if (idsForDelete.length) {
+      handleDeleteTodos(idsForDelete, setTodos, setIdsForDelete, setError);
+    }
+  }, [idsForDelete]);
+
+  useEffect(() => {
+    if (idsForUpdate.length) {
+      handleUpdateTodos(
+        idsForUpdate,
+        newTodoData,
+        setTodos,
+        setIdsForUpdate,
+        setError,
+      );
+    }
+  }, [idsForUpdate, newTodoData]);
+
+  useEffect(() => {
+    handleFetchTodos(setTodos, setError);
+  }, []);
 
   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
+          todos={todos}
+          tempTodo={tempTodo}
+          numberOfActiveTodos={numberOfActiveTodos}
+          setTodos={setTodos}
+          setError={setError}
+          setTempTodo={setTempTodo}
+          setIdsForUpdate={setIdsForUpdate}
+          setNewTodoData={setNewTodoData}
+        />
+
+        <TodoList
+          todos={filteredTodos}
+          idsForDelete={idsForDelete}
+          idsForUpdate={idsForUpdate}
+          setIdsForDelete={setIdsForDelete}
+          setIdsForUpdate={setIdsForUpdate}
+          setNewTodoData={setNewTodoData}
+        />
+
+        {tempTodo && (
+          <TodoItem
+            todo={tempTodo}
+            setIdsForDelete={setIdsForDelete}
+            setIdsForUpdate={setIdsForUpdate}
+            setNewTodoData={setNewTodoData}
+          />
+        )}
+
+        {!!todos.length && (
+          <Footer
+            selectedFilter={selectedFilter}
+            completedTodosId={completedTodosId}
+            numberOfActiveTodos={numberOfActiveTodos}
+            setSelectedFilter={setSelectedFilter}
+            setIdsForDelete={setIdsForDelete}
+          />
+        )}
+      </div>
+
+      <ErrorMessage error={error} setError={setError} />
+    </div>
   );
 };
diff --git a/src/api/todos.ts b/src/api/todos.ts
new file mode 100644
index 000000000..448448f12
--- /dev/null
+++ b/src/api/todos.ts
@@ -0,0 +1,24 @@
+import { Todo } from '../types/Todo';
+
+import { client } from '../utils/fetchClient';
+
+import { USER_ID } from '../constants/constants';
+
+export const getTodos = (): Promise<Todo[]> => {
+  return client.get<Todo[]>(`/todos?userId=${USER_ID}`);
+};
+
+export const addTodo = (newTodo: Omit<Todo, 'id'>): Promise<Todo> => {
+  return client.post<Todo>('/todos', newTodo);
+};
+
+export const deleteTodo = (id: number): Promise<unknown> => {
+  return client.delete(`/todos/${id}`);
+};
+
+export const updateTodo = (
+  id: number,
+  updates: Partial<Todo>,
+): Promise<Todo> => {
+  return client.patch<Todo>(`/todos/${id}`, updates);
+};
diff --git a/src/components/ErrorMessage/ErrorMessage.tsx b/src/components/ErrorMessage/ErrorMessage.tsx
new file mode 100644
index 000000000..2c32b2121
--- /dev/null
+++ b/src/components/ErrorMessage/ErrorMessage.tsx
@@ -0,0 +1,33 @@
+import { FC } from 'react';
+import cn from 'classnames';
+
+import { Errors } from '../../types/Errors';
+import { handleError } from '../../utils/handleError';
+
+interface Props {
+  error: Errors;
+  setError: (error: Errors) => void;
+}
+
+export const ErrorMessage: FC<Props> = ({ error, setError }) => {
+  const handleClose = () => {
+    handleError(Errors.DEFAULT, setError);
+  };
+
+  return (
+    <div
+      data-cy="ErrorNotification"
+      className={cn('notification is-danger is-light has-text-weight-normal', {
+        hidden: !error,
+      })}
+    >
+      <button
+        data-cy="HideErrorButton"
+        type="button"
+        className="delete"
+        onClick={handleClose}
+      />
+      {error}
+    </div>
+  );
+};
diff --git a/src/components/ErrorMessage/index.ts b/src/components/ErrorMessage/index.ts
new file mode 100644
index 000000000..3dee9621e
--- /dev/null
+++ b/src/components/ErrorMessage/index.ts
@@ -0,0 +1 @@
+export * from './ErrorMessage';
diff --git a/src/components/Footer/Footer.tsx b/src/components/Footer/Footer.tsx
new file mode 100644
index 000000000..9f37e530d
--- /dev/null
+++ b/src/components/Footer/Footer.tsx
@@ -0,0 +1,58 @@
+import { FC } from 'react';
+import cn from 'classnames';
+
+import { FilterBy } from '../../types/FilterBy';
+
+interface Props {
+  selectedFilter: FilterBy;
+  completedTodosId: number[];
+  numberOfActiveTodos: number;
+  setSelectedFilter: (filter: FilterBy) => void;
+  setIdsForDelete: (ids: number[]) => void;
+}
+
+const Footer: FC<Props> = ({
+  selectedFilter,
+  completedTodosId,
+  numberOfActiveTodos,
+  setSelectedFilter,
+  setIdsForDelete,
+}) => {
+  const filters = Object.values(FilterBy);
+
+  return (
+    <footer className="todoapp__footer" data-cy="Footer">
+      <span className="todo-count" data-cy="TodosCounter">
+        {numberOfActiveTodos} items left
+      </span>
+
+      <nav className="filter" data-cy="Filter">
+        {filters.map(filter => (
+          <a
+            key={filter}
+            href="#/"
+            className={cn('filter__link', {
+              selected: filter === selectedFilter,
+            })}
+            data-cy={`FilterLink${filter}`}
+            onClick={() => setSelectedFilter(filter)}
+          >
+            {filter}
+          </a>
+        ))}
+      </nav>
+
+      <button
+        type="button"
+        className="todoapp__clear-completed"
+        data-cy="ClearCompletedButton"
+        onClick={() => setIdsForDelete(completedTodosId)}
+        disabled={!completedTodosId.length}
+      >
+        Clear completed
+      </button>
+    </footer>
+  );
+};
+
+export default Footer;
diff --git a/src/components/Footer/index.ts b/src/components/Footer/index.ts
new file mode 100644
index 000000000..da94c2936
--- /dev/null
+++ b/src/components/Footer/index.ts
@@ -0,0 +1 @@
+export { default as Footer } from './Footer';
diff --git a/src/components/Header/Header.tsx b/src/components/Header/Header.tsx
new file mode 100644
index 000000000..8431b79fb
--- /dev/null
+++ b/src/components/Header/Header.tsx
@@ -0,0 +1,116 @@
+import { ChangeEvent, FC, FormEvent, useEffect, useRef, useState } from 'react';
+import cn from 'classnames';
+
+import { Todo } from '../../types/Todo';
+import { Errors } from '../../types/Errors';
+
+import { addTodo } from '../../api/todos';
+import { handleError } from '../../utils/handleError';
+
+import { USER_ID } from '../../constants/constants';
+
+interface Props {
+  todos: Todo[];
+  tempTodo: Todo | null;
+  numberOfActiveTodos: number;
+  setTodos: (updateTodos: (todos: Todo[]) => Todo[]) => void;
+  setError: (error: Errors) => void;
+  setTempTodo: (todo: Todo | null) => void;
+  setIdsForUpdate: (prevIds: (ids: number[]) => number[]) => void;
+  setNewTodoData: (newData: Partial<Todo>) => void;
+}
+
+const Header: FC<Props> = ({
+  todos,
+  tempTodo,
+  numberOfActiveTodos,
+  setTodos,
+  setError,
+  setTempTodo,
+  setIdsForUpdate,
+  setNewTodoData,
+}) => {
+  const [title, setTitle] = useState('');
+  const inputRef = useRef<HTMLInputElement>(null);
+
+  const handleChangeTitle = (event: ChangeEvent<HTMLInputElement>) => {
+    setTitle(event.target.value.trimStart());
+  };
+
+  const handleFormSubmit = async (event: FormEvent<HTMLFormElement>) => {
+    event.preventDefault();
+
+    const formattedTitle = title.trim();
+
+    if (!formattedTitle) {
+      handleError(Errors.TITLE_ERROR, setError);
+
+      return;
+    }
+
+    const newTodo: Omit<Todo, 'id'> = {
+      userId: USER_ID,
+      title: formattedTitle,
+      completed: false,
+    };
+
+    const tmpTodo: Todo = {
+      id: 0,
+      ...newTodo,
+    };
+
+    setTempTodo(tmpTodo);
+
+    try {
+      const todo = await addTodo(newTodo);
+
+      setTodos(currentTodos => [...currentTodos, todo]);
+      setTitle('');
+      setTempTodo(null);
+    } catch {
+      setTempTodo(null);
+      handleError(Errors.ADD_TODO, setError);
+    }
+  };
+
+  const handleToggleAll = () => {
+    const isAllTodosCompleted = todos.every(todo => todo.completed);
+
+    todos.map(todo => {
+      setIdsForUpdate(currentIds => [...currentIds, todo.id]);
+      setNewTodoData({ completed: isAllTodosCompleted ? false : true });
+    });
+  };
+
+  useEffect(() => {
+    inputRef.current?.focus();
+  }, [todos, tempTodo]);
+
+  return (
+    <header className="todoapp__header">
+      <button
+        type="button"
+        className={cn('todoapp__toggle-all', {
+          active: !numberOfActiveTodos,
+        })}
+        data-cy="ToggleAllButton"
+        onClick={handleToggleAll}
+      />
+
+      <form onSubmit={handleFormSubmit}>
+        <input
+          data-cy="NewTodoField"
+          type="text"
+          className="todoapp__new-todo"
+          placeholder="What needs to be done?"
+          ref={inputRef}
+          value={title}
+          onChange={handleChangeTitle}
+          disabled={!!tempTodo}
+        />
+      </form>
+    </header>
+  );
+};
+
+export default Header;
diff --git a/src/components/Header/index.ts b/src/components/Header/index.ts
new file mode 100644
index 000000000..5653319de
--- /dev/null
+++ b/src/components/Header/index.ts
@@ -0,0 +1 @@
+export { default as Header } from './Header';
diff --git a/src/components/TodoItem/TodoItem.tsx b/src/components/TodoItem/TodoItem.tsx
new file mode 100644
index 000000000..6c64a9209
--- /dev/null
+++ b/src/components/TodoItem/TodoItem.tsx
@@ -0,0 +1,154 @@
+import {
+  ChangeEvent,
+  FC,
+  FormEvent,
+  useCallback,
+  useEffect,
+  useState,
+} from 'react';
+import cn from 'classnames';
+
+import { Todo } from '../../types/Todo';
+
+interface Props {
+  todo: Todo;
+  idsForDelete?: number[];
+  idsForUpdate?: number[];
+  setIdsForDelete: (prevIds: (ids: number[]) => number[]) => void;
+  setIdsForUpdate: (prevIds: (ids: number[]) => number[]) => void;
+  setNewTodoData: (newTodoData: Partial<Todo>) => void;
+}
+
+export const TodoItem: FC<Props> = ({
+  todo,
+  idsForDelete,
+  idsForUpdate,
+  setIdsForDelete,
+  setIdsForUpdate,
+  setNewTodoData,
+}) => {
+  const [newTitle, setNewTitle] = useState(todo.title);
+  const [isEditing, setIsEditing] = useState(false);
+
+  const { id, title, completed } = todo;
+
+  const handleTitleChange = (event: ChangeEvent<HTMLInputElement>) => {
+    setNewTitle(event.target.value.trimStart());
+  };
+
+  const handleFormSubmit = (event: FormEvent<HTMLFormElement>) => {
+    event.preventDefault();
+  };
+
+  const handleDelete = useCallback(() => {
+    setIdsForDelete(currentIds => [...currentIds, id]);
+  }, [id, setIdsForDelete]);
+
+  const handleUpdate = (event: ChangeEvent<HTMLInputElement>) => {
+    setNewTodoData({
+      completed: event.target.checked,
+      title: newTitle.trim(),
+    });
+    setIdsForUpdate(currentIds => [...currentIds, id]);
+  };
+
+  const handleTitleSave = useCallback(() => {
+    const trimmedTitle = newTitle.trim();
+
+    if (!trimmedTitle) {
+      handleDelete();
+
+      return;
+    }
+
+    setNewTodoData({ title: trimmedTitle });
+    setIdsForUpdate(currentIds => [...currentIds, id]);
+    setIsEditing(false);
+  }, [id, newTitle, setNewTodoData, handleDelete, setIdsForUpdate]);
+
+  const handleKeyUp = useCallback(
+    (event: KeyboardEvent) => {
+      if (event.key === 'Escape') {
+        setIsEditing(false);
+        setNewTitle(title);
+      } else if (event.key === 'Enter') {
+        handleTitleSave();
+      }
+    },
+    [title, handleTitleSave],
+  );
+
+  const isLoaderShow =
+    !id || idsForDelete?.includes(id) || idsForUpdate?.includes(id);
+
+  useEffect(() => {
+    if (isEditing) {
+      document.addEventListener('keyup', handleKeyUp);
+    }
+
+    return () => {
+      document.removeEventListener('keyup', handleKeyUp);
+    };
+  }, [isEditing, handleKeyUp]);
+
+  return (
+    <div
+      data-cy="Todo"
+      className={cn('todo', {
+        completed,
+      })}
+      onDoubleClick={() => setIsEditing(true)}
+    >
+      {/* eslint-disable-next-line jsx-a11y/label-has-associated-control */}
+      <label className="todo__status-label">
+        <input
+          data-cy="TodoStatus"
+          type="checkbox"
+          className="todo__status"
+          defaultChecked={completed}
+          onChange={handleUpdate}
+        />
+      </label>
+
+      {isEditing ? (
+        <form onSubmit={handleFormSubmit}>
+          <input
+            data-cy="TodoTitleField"
+            type="text"
+            className="todo__title-field"
+            placeholder="Empty todo will be deleted"
+            autoFocus
+            value={newTitle}
+            onChange={handleTitleChange}
+            onBlur={handleTitleSave}
+          />
+        </form>
+      ) : (
+        <>
+          <span data-cy="TodoTitle" className="todo__title">
+            {title}
+          </span>
+
+          <button
+            type="button"
+            className="todo__remove"
+            data-cy="TodoDelete"
+            onClick={handleDelete}
+          >
+            ×
+          </button>
+        </>
+      )}
+
+      <div
+        data-cy="TodoLoader"
+        className={cn('modal overlay', {
+          'is-active': isLoaderShow,
+        })}
+      >
+        <div className="modal-background has-background-white-ter" />
+        <div className="loader" />
+      </div>
+    </div>
+  );
+};
diff --git a/src/components/TodoItem/index.ts b/src/components/TodoItem/index.ts
new file mode 100644
index 000000000..21f4abac3
--- /dev/null
+++ b/src/components/TodoItem/index.ts
@@ -0,0 +1 @@
+export * from './TodoItem';
diff --git a/src/components/TodoList/TodoList.tsx b/src/components/TodoList/TodoList.tsx
new file mode 100644
index 000000000..6e5a490d5
--- /dev/null
+++ b/src/components/TodoList/TodoList.tsx
@@ -0,0 +1,39 @@
+import { FC } from 'react';
+
+import { Todo } from '../../types/Todo';
+
+import { TodoItem } from '../TodoItem';
+
+interface Props {
+  todos: Todo[];
+  idsForDelete: number[];
+  idsForUpdate: number[];
+  setIdsForDelete: (prevIds: (ids: number[]) => number[]) => void;
+  setIdsForUpdate: (prevIds: (ids: number[]) => number[]) => void;
+  setNewTodoData: (newTodoData: Partial<Todo>) => void;
+}
+
+export const TodoList: FC<Props> = ({
+  todos,
+  idsForDelete,
+  idsForUpdate,
+  setIdsForDelete,
+  setIdsForUpdate,
+  setNewTodoData,
+}) => {
+  return (
+    <section className="todoapp__main" data-cy="TodoList">
+      {todos.map(todo => (
+        <TodoItem
+          key={todo.id}
+          todo={todo}
+          idsForDelete={idsForDelete}
+          idsForUpdate={idsForUpdate}
+          setIdsForDelete={setIdsForDelete}
+          setIdsForUpdate={setIdsForUpdate}
+          setNewTodoData={setNewTodoData}
+        />
+      ))}
+    </section>
+  );
+};
diff --git a/src/components/TodoList/index.ts b/src/components/TodoList/index.ts
new file mode 100644
index 000000000..f239f4345
--- /dev/null
+++ b/src/components/TodoList/index.ts
@@ -0,0 +1 @@
+export * from './TodoList';
diff --git a/src/components/index.ts b/src/components/index.ts
new file mode 100644
index 000000000..788fc6d24
--- /dev/null
+++ b/src/components/index.ts
@@ -0,0 +1,5 @@
+export * from './Header';
+export * from './TodoList';
+export * from './TodoItem';
+export * from './Footer';
+export * from './ErrorMessage';
diff --git a/src/constants/constants.ts b/src/constants/constants.ts
new file mode 100644
index 000000000..38e4f9b87
--- /dev/null
+++ b/src/constants/constants.ts
@@ -0,0 +1 @@
+export const USER_ID = 1443;
diff --git a/src/types/Errors.ts b/src/types/Errors.ts
new file mode 100644
index 000000000..5d5de3b87
--- /dev/null
+++ b/src/types/Errors.ts
@@ -0,0 +1,8 @@
+export enum Errors {
+  DEFAULT = '',
+  LOAD_ERROR = 'Unable to load todos',
+  TITLE_ERROR = 'Title should not be empty',
+  ADD_TODO = 'Unable to add a todo',
+  DELETE_TODO = 'Unable to delete a todo',
+  UPDATE_TODO = 'Unable to update a todo',
+}
diff --git a/src/types/FilterBy.ts b/src/types/FilterBy.ts
new file mode 100644
index 000000000..f2dfad262
--- /dev/null
+++ b/src/types/FilterBy.ts
@@ -0,0 +1,5 @@
+export enum FilterBy {
+  ALL = 'All',
+  ACTIVE = 'Active',
+  COMPLETED = 'Completed',
+}
diff --git a/src/types/Todo.ts b/src/types/Todo.ts
new file mode 100644
index 000000000..3f52a5fdd
--- /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 000000000..708ac4c17
--- /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'),
+};
diff --git a/src/utils/getFilteredTodos.ts b/src/utils/getFilteredTodos.ts
new file mode 100644
index 000000000..1a9019aaf
--- /dev/null
+++ b/src/utils/getFilteredTodos.ts
@@ -0,0 +1,17 @@
+import { Todo } from '../types/Todo';
+import { FilterBy } from '../types/FilterBy';
+
+export const getFilteredTodos = (todos: Todo[], filter: FilterBy) => {
+  return todos.filter(todo => {
+    switch (filter) {
+      case FilterBy.ACTIVE:
+        return !todo.completed;
+
+      case FilterBy.COMPLETED:
+        return todo.completed;
+
+      default:
+        return true;
+    }
+  });
+};
diff --git a/src/utils/handleDeleteTodos.ts b/src/utils/handleDeleteTodos.ts
new file mode 100644
index 000000000..a26e89a3e
--- /dev/null
+++ b/src/utils/handleDeleteTodos.ts
@@ -0,0 +1,29 @@
+import { Dispatch, SetStateAction } from 'react';
+
+import { Todo } from '../types/Todo';
+import { Errors } from '../types/Errors';
+
+import { deleteTodo } from '../api/todos';
+import { handleError } from './handleError';
+
+export const handleDeleteTodos = (
+  idsForDelete: number[],
+  setTodos: Dispatch<SetStateAction<Todo[]>>,
+  setIdsForDelete: Dispatch<SetStateAction<number[]>>,
+  setError: Dispatch<SetStateAction<Errors>>,
+) => {
+  Promise.allSettled(
+    idsForDelete.map(id =>
+      deleteTodo(id)
+        .then(() => {
+          setTodos(currentTodos => currentTodos.filter(todo => todo.id !== id));
+        })
+        .catch(() => {
+          handleError(Errors.DELETE_TODO, setError);
+        })
+        .finally(() => {
+          setIdsForDelete([]);
+        }),
+    ),
+  );
+};
diff --git a/src/utils/handleError.ts b/src/utils/handleError.ts
new file mode 100644
index 000000000..a9756da24
--- /dev/null
+++ b/src/utils/handleError.ts
@@ -0,0 +1,12 @@
+import { Errors } from '../types/Errors';
+
+export const handleError = (
+  error: Errors,
+  setError: (error: Errors) => void,
+) => {
+  setError(error);
+
+  setTimeout(() => {
+    setError(Errors.DEFAULT);
+  }, 3000);
+};
diff --git a/src/utils/handleFetchTodos.ts b/src/utils/handleFetchTodos.ts
new file mode 100644
index 000000000..8fd04f730
--- /dev/null
+++ b/src/utils/handleFetchTodos.ts
@@ -0,0 +1,18 @@
+import { Todo } from '../types/Todo';
+import { Errors } from '../types/Errors';
+
+import { getTodos } from '../api/todos';
+import { handleError } from './handleError';
+
+export const handleFetchTodos = async (
+  setTodos: (todos: Todo[]) => void,
+  setError: (error: Errors) => void,
+) => {
+  try {
+    const todos = await getTodos();
+
+    setTodos(todos);
+  } catch {
+    handleError(Errors.LOAD_ERROR, setError);
+  }
+};
diff --git a/src/utils/handleUpdateTodos.ts b/src/utils/handleUpdateTodos.ts
new file mode 100644
index 000000000..d84c3de95
--- /dev/null
+++ b/src/utils/handleUpdateTodos.ts
@@ -0,0 +1,33 @@
+import { Dispatch, SetStateAction } from 'react';
+
+import { Todo } from '../types/Todo';
+import { Errors } from '../types/Errors';
+
+import { updateTodo } from '../api/todos';
+import { handleError } from './handleError';
+
+export const handleUpdateTodos = (
+  idsForUpdate: number[],
+  newData: Partial<Todo>,
+  setTodos: Dispatch<SetStateAction<Todo[]>>,
+  setIdsForUpdate: Dispatch<SetStateAction<number[]>>,
+  setError: Dispatch<SetStateAction<Errors>>,
+) => {
+  Promise.allSettled(
+    idsForUpdate.map(id =>
+      updateTodo(id, newData)
+        .then(updatedTodo => {
+          setTodos(currentTodos =>
+            currentTodos.map(todo =>
+              todo.id !== updatedTodo.id ? todo : updatedTodo,
+            ),
+          );
+        })
+        .catch(() => {
+          handleError(Errors.UPDATE_TODO, setError);
+        }),
+    ),
+  ).finally(() => {
+    setIdsForUpdate([]);
+  });
+};