diff --git a/README.md b/README.md
index 47a1add059..5fc4f26ec4 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://maxsabo.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..8c336a3638 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -1,26 +1,177 @@
-/* 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';
-
-const USER_ID = 0;
+import React, { useEffect, useMemo, useRef, useState } from 'react';
+import {
+  addTodo,
+  deleteTodo,
+  getTodos,
+  updateTodo,
+  USER_ID,
+} from './api/todos';
+import { Todo } from './types/Todo';
+import { TodoHeader } from './components/TodoHeader';
+import { TodoFooter } from './components/TodoFooter';
+import { ErrorNotification } from './components/ErrorNotification';
+import { ErrorType } from './types/ErrorTypes';
+import { FilterStatus } from './types/FilterStatus';
+import { TodoList } from './components/TodoList';
 
 export const App: React.FC = () => {
-  if (!USER_ID) {
-    return <UserWarning />;
-  }
+  const [todos, setTodos] = useState<Todo[]>([]);
+  const [errorMessage, setErrorMessage] = useState<ErrorType>(ErrorType.Empty);
+  const [filterStatus, setFilterStatus] = useState<FilterStatus>(
+    FilterStatus.All,
+  );
+  const [tempTodo, setTempTodo] = useState<Todo | null>(null);
+  const [loadingTodoIds, setLoadingTodoIds] = useState<number[]>([]);
+
+  const inputAddRef = useRef<HTMLInputElement>(null);
+
+  const filteredTodos = useMemo(
+    () =>
+      todos.filter(todo => {
+        if (filterStatus === FilterStatus.All) {
+          return true;
+        }
+
+        return filterStatus === FilterStatus.Completed
+          ? todo.completed
+          : !todo.completed;
+      }),
+    [todos, filterStatus],
+  );
+
+  const todosActiveNum = useMemo(
+    () => todos.filter(todo => !todo.completed).length,
+    [todos],
+  );
+
+  const todosCompleted = useMemo(
+    () => todos.filter(todo => todo.completed).length,
+    [todos],
+  );
+
+  const areAllTodosCompleted = useMemo(
+    () => todos.every(todo => todo.completed),
+    [todos],
+  );
+
+  const onAddTodo = async (todoTitle: string) => {
+    setTempTodo({ id: 0, title: todoTitle, completed: false, userId: USER_ID });
+    try {
+      const newTodo = await addTodo({ title: todoTitle, completed: false });
+
+      setTodos(prev => [...prev, newTodo]);
+    } catch (err) {
+      setErrorMessage(ErrorType.AddTodo);
+      inputAddRef?.current?.focus();
+      throw err;
+    } finally {
+      setTempTodo(null);
+    }
+  };
+
+  const onRemoveTodo = async (todoId: number) => {
+    setLoadingTodoIds(prev => [...prev, todoId]);
+    try {
+      await deleteTodo(todoId);
+
+      setTodos(prev => prev.filter(todo => todo.id !== todoId));
+    } catch (err) {
+      setErrorMessage(ErrorType.DeleteTodo);
+      inputAddRef?.current?.focus();
+      throw err;
+    } finally {
+      setLoadingTodoIds(prev => prev.filter(id => id !== todoId));
+    }
+  };
+
+  const onUpdateTodo = async (todoToUpdate: Todo) => {
+    setLoadingTodoIds(prev => [...prev, todoToUpdate.id]);
+    try {
+      const updatedTodo = await updateTodo(todoToUpdate);
+
+      setTodos(prev =>
+        prev.map(todo => (todo.id === updatedTodo.id ? updatedTodo : todo)),
+      );
+    } catch (err) {
+      setErrorMessage(ErrorType.UpdateTodo);
+      throw err;
+    } finally {
+      setLoadingTodoIds(prev => prev.filter(id => id !== todoToUpdate.id));
+    }
+  };
+
+  const onClearCompleted = async () => {
+    const completedTodos = todos.filter(todo => todo.completed);
+
+    completedTodos.forEach(todo => {
+      onRemoveTodo(todo.id);
+    });
+  };
+
+  const onToggleAll = async () => {
+    if (todosActiveNum > 0) {
+      const activeTodos = todos.filter(todo => !todo.completed);
+
+      activeTodos.forEach(todo => {
+        onUpdateTodo({ ...todo, completed: true });
+      });
+    } else {
+      todos.forEach(todo => {
+        onUpdateTodo({ ...todo, completed: false });
+      });
+    }
+  };
+
+  useEffect(() => {
+    (async () => {
+      try {
+        const data = await getTodos();
+
+        setTodos(data);
+      } catch (err) {
+        setErrorMessage(ErrorType.LoadTodos);
+      }
+    })();
+  }, []);
 
   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">
+        <TodoHeader
+          onAddTodo={onAddTodo}
+          setErrorMessage={setErrorMessage}
+          isInputDisabled={!!tempTodo}
+          onToggleAll={onToggleAll}
+          areAllTodosCompleted={areAllTodosCompleted}
+          todosLength={todos.length}
+          inputRef={inputAddRef}
+        />
+
+        {(todos.length > 0 || tempTodo) && (
+          <>
+            <TodoList
+              filteredTodos={filteredTodos}
+              loadingTodoIds={loadingTodoIds}
+              tempTodo={tempTodo}
+              onRemoveTodo={onRemoveTodo}
+              onUpdateTodo={onUpdateTodo}
+            />
+            <TodoFooter
+              filterStatus={filterStatus}
+              setFilterStatus={setFilterStatus}
+              todosLeft={todosActiveNum}
+              todosCompleted={todosCompleted}
+              onClearCompleted={onClearCompleted}
+            />
+          </>
+        )}
+      </div>
+
+      <ErrorNotification error={errorMessage} setError={setErrorMessage} />
+    </div>
   );
 };
diff --git a/src/api/todos.ts b/src/api/todos.ts
new file mode 100644
index 0000000000..b519829a76
--- /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 = 2164;
+
+export const getTodos = () => {
+  return client.get<Todo[]>(`/todos?userId=${USER_ID}`);
+};
+
+export const addTodo = (newTodo: Omit<Todo, 'id' | 'userId'>) => {
+  return client.post<Todo>(`/todos`, { ...newTodo, userId: USER_ID });
+};
+
+export const deleteTodo = (todoId: number) => {
+  return client.delete(`/todos/${todoId}`);
+};
+
+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..3c5dc467aa
--- /dev/null
+++ b/src/components/ErrorNotification.tsx
@@ -0,0 +1,44 @@
+import React, { Dispatch, SetStateAction, useEffect } from 'react';
+import { ErrorType } from '../types/ErrorTypes';
+import classNames from 'classnames';
+
+type Props = {
+  error: ErrorType;
+  setError: Dispatch<SetStateAction<ErrorType>>;
+};
+
+export const ErrorNotification: React.FC<Props> = props => {
+  const { error, setError } = props;
+
+  useEffect(() => {
+    if (error === ErrorType.Empty) {
+      return;
+    }
+
+    const timerId = setTimeout(() => {
+      setError(ErrorType.Empty);
+    }, 3000);
+
+    return () => {
+      clearTimeout(timerId);
+    };
+  }, [error, setError]);
+
+  return (
+    <div
+      data-cy="ErrorNotification"
+      className={classNames(
+        'notification is-danger is-light has-text-weight-normal',
+        { hidden: error === ErrorType.Empty },
+      )}
+    >
+      <button
+        data-cy="HideErrorButton"
+        type="button"
+        className="delete"
+        onClick={() => setError(ErrorType.Empty)}
+      />
+      {error}
+    </div>
+  );
+};
diff --git a/src/components/TodoFooter.tsx b/src/components/TodoFooter.tsx
new file mode 100644
index 0000000000..045ac864b3
--- /dev/null
+++ b/src/components/TodoFooter.tsx
@@ -0,0 +1,57 @@
+import React, { Dispatch, SetStateAction } from 'react';
+import { FilterStatus } from '../types/FilterStatus';
+import classNames from 'classnames';
+
+type Props = {
+  filterStatus: FilterStatus;
+  setFilterStatus: Dispatch<SetStateAction<FilterStatus>>;
+  todosLeft: number;
+  todosCompleted: number;
+  onClearCompleted: () => Promise<void>;
+};
+
+export const TodoFooter: React.FC<Props> = props => {
+  const {
+    filterStatus,
+    setFilterStatus,
+    todosLeft,
+    todosCompleted,
+    onClearCompleted,
+  } = props;
+
+  return (
+    <footer className="todoapp__footer" data-cy="Footer">
+      <span className="todo-count" data-cy="TodosCounter">
+        {todosLeft} items left
+      </span>
+
+      {/* Active link should have the 'selected' class */}
+      <nav className="filter" data-cy="Filter">
+        {Object.values(FilterStatus).map(filter => (
+          <a
+            key={filter}
+            href={`#/${filter === FilterStatus.All ? '' : filter.toLocaleLowerCase()}`}
+            className={classNames('filter__link', {
+              selected: filterStatus === filter,
+            })}
+            data-cy={`FilterLink${filter}`}
+            onClick={() => setFilterStatus(filter)}
+          >
+            {filter}
+          </a>
+        ))}
+      </nav>
+
+      {/* this button should be disabled if there are no completed todos */}
+      <button
+        type="button"
+        className="todoapp__clear-completed"
+        data-cy="ClearCompletedButton"
+        onClick={onClearCompleted}
+        disabled={todosCompleted === 0}
+      >
+        Clear completed
+      </button>
+    </footer>
+  );
+};
diff --git a/src/components/TodoHeader.tsx b/src/components/TodoHeader.tsx
new file mode 100644
index 0000000000..d669209bb7
--- /dev/null
+++ b/src/components/TodoHeader.tsx
@@ -0,0 +1,80 @@
+import React, { Dispatch, SetStateAction, useEffect, useState } from 'react';
+import { ErrorType } from '../types/ErrorTypes';
+import classNames from 'classnames';
+
+type Props = {
+  onAddTodo: (value: string) => Promise<void>;
+  setErrorMessage: Dispatch<SetStateAction<ErrorType>>;
+  isInputDisabled: boolean;
+  todosLength: number;
+  areAllTodosCompleted: boolean;
+  onToggleAll: () => Promise<void>;
+  inputRef: React.RefObject<HTMLInputElement> | null;
+};
+
+export const TodoHeader: React.FC<Props> = props => {
+  const {
+    onAddTodo,
+    setErrorMessage,
+    isInputDisabled,
+    onToggleAll,
+    todosLength,
+    areAllTodosCompleted,
+    inputRef,
+  } = props;
+
+  const [inputValue, setInputValue] = useState('');
+
+  const onSubmit = async (event: React.FormEvent<HTMLFormElement>) => {
+    event.preventDefault();
+    if (inputValue.trim() === '') {
+      setErrorMessage(ErrorType.EmptyTitle);
+
+      return;
+    }
+
+    try {
+      await onAddTodo(inputValue.trim());
+      setInputValue('');
+    } catch (err) {}
+  };
+
+  useEffect(() => {
+    inputRef?.current?.focus();
+  }, [todosLength, inputRef]);
+
+  useEffect(() => {
+    if (!isInputDisabled) {
+      inputRef?.current?.focus();
+    }
+  }, [isInputDisabled, inputRef]);
+
+  return (
+    <header className="todoapp__header">
+      {todosLength !== 0 && (
+        <button
+          type="button"
+          className={classNames('todoapp__toggle-all', {
+            active: areAllTodosCompleted,
+          })}
+          data-cy="ToggleAllButton"
+          onClick={onToggleAll}
+        />
+      )}
+
+      {/* Add a todo on form submit */}
+      <form onSubmit={onSubmit}>
+        <input
+          data-cy="NewTodoField"
+          type="text"
+          className="todoapp__new-todo"
+          placeholder="What needs to be done?"
+          ref={inputRef}
+          value={inputValue}
+          onChange={event => setInputValue(event.target.value)}
+          disabled={isInputDisabled}
+        />
+      </form>
+    </header>
+  );
+};
diff --git a/src/components/TodoItem.tsx b/src/components/TodoItem.tsx
new file mode 100644
index 0000000000..a06ed6ddde
--- /dev/null
+++ b/src/components/TodoItem.tsx
@@ -0,0 +1,129 @@
+/* eslint-disable jsx-a11y/label-has-associated-control */
+import React, { Dispatch, SetStateAction, useRef, useState } from 'react';
+import { Todo } from '../types/Todo';
+import classNames from 'classnames';
+
+type Props = {
+  todo: Todo;
+  isLoading?: boolean;
+  isInEditMode?: boolean;
+  onRemoveTodo: (todoId: number) => Promise<void>;
+  onUpdateTodo: (todo: Todo) => Promise<void>;
+  setEditedTodoId: Dispatch<SetStateAction<null | number>>;
+};
+
+export const TodoItem: React.FC<Props> = props => {
+  const {
+    todo,
+    isLoading,
+    isInEditMode,
+    onRemoveTodo,
+    onUpdateTodo,
+    setEditedTodoId,
+  } = props;
+
+  const [todoTitleValue, setTodoTitleValue] = useState(todo.title);
+
+  const inputRef = useRef<HTMLInputElement>(null);
+
+  const onCheckTodo = () => {
+    const todoToUpdate = { ...todo, completed: !todo.completed };
+
+    onUpdateTodo(todoToUpdate);
+  };
+
+  const onDoubleClick = () => {
+    setEditedTodoId(todo.id);
+  };
+
+  // eslint-disable-next-line max-len, prettier/prettier
+  const onBlur = async (event: React.FocusEvent<HTMLInputElement, Element> | React.FormEvent<HTMLFormElement>,
+  ) => {
+    event.preventDefault();
+    const normalizedTitle = todoTitleValue.trim();
+
+    if (todo.title === normalizedTitle) {
+      setEditedTodoId(null);
+
+      return;
+    }
+
+    try {
+      if (normalizedTitle === '') {
+        await onRemoveTodo(todo.id);
+      } else {
+        await onUpdateTodo({ ...todo, title: normalizedTitle });
+      }
+
+      setEditedTodoId(null);
+    } catch (err) {
+      inputRef?.current?.focus();
+    }
+  };
+
+  const onKeyUp = (event: React.KeyboardEvent<HTMLInputElement>) => {
+    if (event.key === 'Escape') {
+      setEditedTodoId(null);
+      setTodoTitleValue(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}
+          onChange={onCheckTodo}
+        />
+      </label>
+
+      {isInEditMode ? (
+        <form onSubmit={onBlur} onBlur={onBlur}>
+          <input
+            autoFocus
+            data-cy="TodoTitleField"
+            type="text"
+            className="todo__title-field"
+            placeholder="Empty todo will be deleted"
+            value={todoTitleValue}
+            onChange={e => setTodoTitleValue(e.target.value)}
+            onKeyUp={onKeyUp}
+            ref={inputRef}
+          />
+        </form>
+      ) : (
+        <>
+          <span
+            data-cy="TodoTitle"
+            className="todo__title"
+            onDoubleClick={onDoubleClick}
+          >
+            {todo.title}
+          </span>
+          <button
+            type="button"
+            className="todo__remove"
+            data-cy="TodoDelete"
+            onClick={() => onRemoveTodo(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..0a7f40578e
--- /dev/null
+++ b/src/components/TodoList.tsx
@@ -0,0 +1,48 @@
+import React, { useState } from 'react';
+import { TodoItem } from './TodoItem';
+import { Todo } from '../types/Todo';
+
+type Props = {
+  filteredTodos: Todo[];
+  loadingTodoIds: number[];
+  tempTodo: Todo | null;
+  onRemoveTodo: (todoId: number) => Promise<void>;
+  onUpdateTodo: (todo: Todo) => Promise<void>;
+};
+
+export const TodoList: React.FC<Props> = props => {
+  const {
+    filteredTodos,
+    loadingTodoIds,
+    tempTodo,
+    onRemoveTodo,
+    onUpdateTodo,
+  } = props;
+
+  const [editedTodoId, setEditedTodoId] = useState<null | number>(null);
+
+  return (
+    <section className="todoapp__main" data-cy="TodoList">
+      {filteredTodos.map(todo => (
+        <TodoItem
+          key={todo.id}
+          todo={todo}
+          onRemoveTodo={onRemoveTodo}
+          onUpdateTodo={onUpdateTodo}
+          isLoading={loadingTodoIds.includes(todo.id)}
+          isInEditMode={editedTodoId === todo.id}
+          setEditedTodoId={setEditedTodoId}
+        />
+      ))}
+      {tempTodo && (
+        <TodoItem
+          todo={tempTodo}
+          onRemoveTodo={onRemoveTodo}
+          onUpdateTodo={onUpdateTodo}
+          setEditedTodoId={setEditedTodoId}
+          isLoading
+        />
+      )}
+    </section>
+  );
+};
diff --git a/src/types/ErrorTypes.ts b/src/types/ErrorTypes.ts
new file mode 100644
index 0000000000..66f0a8d5ad
--- /dev/null
+++ b/src/types/ErrorTypes.ts
@@ -0,0 +1,8 @@
+export enum ErrorType {
+  Empty = '',
+  LoadTodos = 'Unable to load todos',
+  EmptyTitle = 'Title should not be empty',
+  AddTodo = 'Unable to add a todo',
+  DeleteTodo = 'Unable to delete a todo',
+  UpdateTodo = 'Unable to update a todo',
+}
diff --git a/src/types/FilterStatus.ts b/src/types/FilterStatus.ts
new file mode 100644
index 0000000000..7ca17f289b
--- /dev/null
+++ b/src/types/FilterStatus.ts
@@ -0,0 +1,5 @@
+export enum FilterStatus {
+  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'),
+};