diff --git a/src/App.tsx b/src/App.tsx
index 81e011f432..63f2a8cd11 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';
+import React, { useState, useEffect, useRef } from 'react';
 import { UserWarning } from './UserWarning';
-
-const USER_ID = 0;
+import {
+  USER_ID,
+  getTodos,
+  addTodo,
+  deleteTodo,
+  updateTodo,
+} from './api/todos';
+import { Todo } from './types/Todo';
+import { Status } from './types/Status';
+import { ErrorMessage } from './types/ErrorMessage';
+import { TodoList } from './components/TodoList';
+import { Header } from './components/Header';
+import { Footer } from './components/Footer';
+import { ErrorNotification } from './components/ErrorNotification';
 
 export const App: React.FC = () => {
+  const [todos, setTodos] = useState<Todo[]>([]);
+  const [filter, setFilter] = useState<Status>(Status.All);
+  const [errorMessage, setErrorMessage] = useState('');
+
+  const [title, setTitle] = useState('');
+  const [tempTodo, setTempTodo] = useState<Todo | null>(null);
+  const [processingIds, setProcessingIds] = useState<number[]>([]);
+
+  const titleField = useRef<HTMLInputElement>(null);
+
+  const showError = (message: string) => {
+    setErrorMessage(message);
+    setTimeout(() => {
+      setErrorMessage('');
+    }, 3000);
+  };
+
+  useEffect(() => {
+    if (!USER_ID) {
+      return;
+    }
+
+    getTodos()
+      .then(setTodos)
+      .catch(() => showError(ErrorMessage.Load));
+  }, []);
+
+  useEffect(() => {
+    if (titleField.current) {
+      titleField.current.focus();
+    }
+  }, [todos.length]);
+
+  const handleAddTodo = (e: React.FormEvent) => {
+    e.preventDefault();
+    const normalizedTitle = title.trim();
+
+    if (!normalizedTitle) {
+      showError(ErrorMessage.EmptyTitle);
+
+      return;
+    }
+
+    setTempTodo({
+      id: 0,
+      title: normalizedTitle,
+      completed: false,
+      userId: USER_ID,
+    });
+
+    addTodo(normalizedTitle)
+      .then(newTodo => {
+        setTodos(currentTodos => [...currentTodos, newTodo]);
+        setTitle('');
+      })
+      .catch(() => {
+        showError(ErrorMessage.Add);
+      })
+      .finally(() => {
+        setTempTodo(null);
+        setTimeout(() => {
+          titleField.current?.focus();
+        }, 0);
+      });
+  };
+
+  const handleUpdateTodo = (todoId: number, data: Partial<Todo>) => {
+    setProcessingIds(current => [...current, todoId]);
+
+    return updateTodo(todoId, data)
+      .then(updatedTodo => {
+        setTodos(current =>
+          current.map(todo => (todo.id === todoId ? updatedTodo : todo)),
+        );
+      })
+      .catch(() => {
+        showError(ErrorMessage.Update);
+        throw new Error('Update failed');
+      })
+      .finally(() => {
+        setProcessingIds(current => current.filter(id => id !== todoId));
+      });
+  };
+
+  const handleToggleAll = () => {
+    const activeTodosCount = todos.filter(todo => !todo.completed).length;
+    const shouldComplete = activeTodosCount > 0;
+
+    const todosToUpdate = todos.filter(
+      todo => todo.completed !== shouldComplete,
+    );
+    const idsToUpdate = todosToUpdate.map(todo => todo.id);
+
+    setProcessingIds(current => [...current, ...idsToUpdate]);
+
+    Promise.all(
+      todosToUpdate.map(todo =>
+        updateTodo(todo.id, { completed: shouldComplete })
+          .then(updatedTodo => updatedTodo)
+          .catch(() => {
+            showError(ErrorMessage.Update);
+
+            return null;
+          }),
+      ),
+    )
+      .then(results => {
+        const successfulUpdates = results.filter((r): r is Todo => r !== null);
+
+        setTodos(current =>
+          current.map(todo => {
+            const updated = successfulUpdates.find(u => u.id === todo.id);
+
+            return updated || todo;
+          }),
+        );
+      })
+      .finally(() => {
+        setProcessingIds(current =>
+          current.filter(id => !idsToUpdate.includes(id)),
+        );
+      });
+  };
+
+  const handleDeleteTodo = (todoId: number) => {
+    setProcessingIds(current => [...current, todoId]);
+
+    deleteTodo(todoId)
+      .then(() => {
+        setTodos(current => current.filter(todo => todo.id !== todoId));
+      })
+      .catch(() => {
+        showError(ErrorMessage.Delete);
+      })
+      .finally(() => {
+        setProcessingIds(current => current.filter(id => id !== todoId));
+      });
+  };
+
+  const handleClearCompleted = () => {
+    const completedTodos = todos.filter(todo => todo.completed);
+    const idsToDelete = completedTodos.map(todo => todo.id);
+
+    setProcessingIds(current => [...current, ...idsToDelete]);
+
+    Promise.all(
+      completedTodos.map(todo =>
+        deleteTodo(todo.id)
+          .then(() => todo.id)
+          .catch(() => {
+            showError(ErrorMessage.Delete);
+
+            return null;
+          }),
+      ),
+    )
+      .then(results => {
+        const successfulIds = results.filter(id => id !== null);
+
+        setTodos(current =>
+          current.filter(todo => !successfulIds.includes(todo.id)),
+        );
+      })
+      .finally(() => {
+        setProcessingIds(current =>
+          current.filter(id => !idsToDelete.includes(id)),
+        );
+      });
+  };
+
+  const visibleTodos = todos.filter(todo => {
+    switch (filter) {
+      case Status.Active:
+        return !todo.completed;
+      case Status.Completed:
+        return todo.completed;
+      case Status.All:
+      default:
+        return true;
+    }
+  });
+
+  const activeTodosCount = todos.filter(todo => !todo.completed).length;
+  const hasCompletedTodos = todos.some(todo => todo.completed);
+
   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
+          title={title}
+          setTitle={setTitle}
+          onAddTodo={handleAddTodo}
+          activeTodosCount={activeTodosCount}
+          todosLength={todos.length}
+          tempTodo={tempTodo}
+          titleField={titleField}
+          onToggleAll={handleToggleAll}
+        />
+
+        {(todos.length > 0 || tempTodo !== null) && (
+          <TodoList
+            todos={visibleTodos}
+            tempTodo={tempTodo}
+            processingIds={processingIds}
+            onDelete={handleDeleteTodo}
+            onUpdate={handleUpdateTodo}
+          />
+        )}
+
+        {todos.length > 0 && (
+          <Footer
+            activeTodosCount={activeTodosCount}
+            filter={filter}
+            onFilterChange={setFilter}
+            hasCompletedTodos={hasCompletedTodos}
+            onClearCompleted={handleClearCompleted}
+          />
+        )}
+      </div>
+
+      <ErrorNotification
+        errorMessage={errorMessage}
+        onClose={() => setErrorMessage('')}
+      />
+    </div>
   );
 };
diff --git a/src/api/todos.ts b/src/api/todos.ts
new file mode 100644
index 0000000000..285b030e60
--- /dev/null
+++ b/src/api/todos.ts
@@ -0,0 +1,24 @@
+import { Todo } from '../types/Todo';
+import { client } from '../utils/fetchClient';
+
+export const USER_ID = 4213;
+
+export const getTodos = () => {
+  return client.get<Todo[]>(`/todos?userId=${USER_ID}`);
+};
+
+export const addTodo = (title: string) => {
+  return client.post<Todo>('/todos', {
+    title,
+    completed: false,
+    userId: USER_ID,
+  });
+};
+
+export const deleteTodo = (todoId: number) => {
+  return client.delete(`/todos/${todoId}`);
+};
+
+export const updateTodo = (todoId: number, data: Partial<Todo>) => {
+  return client.patch<Todo>(`/todos/${todoId}`, data);
+};
diff --git a/src/components/ErrorNotification.tsx b/src/components/ErrorNotification.tsx
new file mode 100644
index 0000000000..e5d28892d3
--- /dev/null
+++ b/src/components/ErrorNotification.tsx
@@ -0,0 +1,32 @@
+import React from 'react';
+import classNames from 'classnames';
+
+type Props = {
+  errorMessage: string;
+  onClose: () => void;
+};
+
+export const ErrorNotification: React.FC<Props> = ({
+  errorMessage,
+  onClose,
+}) => {
+  return (
+    <div
+      data-cy="ErrorNotification"
+      className={classNames(
+        'notification is-danger is-light has-text-weight-normal',
+        {
+          hidden: !errorMessage,
+        },
+      )}
+    >
+      <button
+        data-cy="HideErrorButton"
+        type="button"
+        className="delete"
+        onClick={onClose}
+      />
+      {errorMessage}
+    </div>
+  );
+};
diff --git a/src/components/Filter.tsx b/src/components/Filter.tsx
new file mode 100644
index 0000000000..d028679409
--- /dev/null
+++ b/src/components/Filter.tsx
@@ -0,0 +1,28 @@
+import React from 'react';
+import classNames from 'classnames';
+import { Status } from '../types/Status';
+
+type Props = {
+  filter: Status;
+  onFilterChange: (status: Status) => void;
+};
+
+export const Filter: React.FC<Props> = ({ filter, onFilterChange }) => {
+  return (
+    <nav className="filter" data-cy="Filter">
+      {Object.values(Status).map(statusValue => (
+        <a
+          key={statusValue}
+          href={`#/${statusValue === Status.All ? '' : statusValue}`}
+          className={classNames('filter__link', {
+            selected: filter === statusValue,
+          })}
+          data-cy={`FilterLink${statusValue.charAt(0).toUpperCase() + statusValue.slice(1)}`}
+          onClick={() => onFilterChange(statusValue)}
+        >
+          {statusValue.charAt(0).toUpperCase() + statusValue.slice(1)}
+        </a>
+      ))}
+    </nav>
+  );
+};
diff --git a/src/components/Footer.tsx b/src/components/Footer.tsx
new file mode 100644
index 0000000000..279805c884
--- /dev/null
+++ b/src/components/Footer.tsx
@@ -0,0 +1,39 @@
+import React from 'react';
+import { Filter } from './Filter';
+import { Status } from '../types/Status';
+
+type Props = {
+  activeTodosCount: number;
+  filter: Status;
+  onFilterChange: (status: Status) => void;
+  hasCompletedTodos: boolean;
+  onClearCompleted: () => void;
+};
+
+export const Footer: React.FC<Props> = ({
+  activeTodosCount,
+  filter,
+  onFilterChange,
+  hasCompletedTodos,
+  onClearCompleted,
+}) => {
+  return (
+    <footer className="todoapp__footer" data-cy="Footer">
+      <span className="todo-count" data-cy="TodosCounter">
+        {activeTodosCount} items left
+      </span>
+
+      <Filter filter={filter} onFilterChange={onFilterChange} />
+
+      <button
+        type="button"
+        className="todoapp__clear-completed"
+        data-cy="ClearCompletedButton"
+        disabled={!hasCompletedTodos}
+        onClick={onClearCompleted}
+      >
+        Clear completed
+      </button>
+    </footer>
+  );
+};
diff --git a/src/components/Header.tsx b/src/components/Header.tsx
new file mode 100644
index 0000000000..ab9d0d8a51
--- /dev/null
+++ b/src/components/Header.tsx
@@ -0,0 +1,53 @@
+import React from 'react';
+import classNames from 'classnames';
+import { Todo } from '../types/Todo';
+
+type Props = {
+  title: string;
+  setTitle: (value: string) => void;
+  onAddTodo: (e: React.FormEvent) => void;
+  activeTodosCount: number;
+  todosLength: number;
+  tempTodo: Todo | null;
+  titleField: React.RefObject<HTMLInputElement>;
+  onToggleAll: () => void;
+};
+
+export const Header: React.FC<Props> = ({
+  title,
+  setTitle,
+  onAddTodo,
+  activeTodosCount,
+  todosLength,
+  tempTodo,
+  titleField,
+  onToggleAll,
+}) => {
+  return (
+    <header className="todoapp__header">
+      {todosLength > 0 && (
+        <button
+          type="button"
+          className={classNames('todoapp__toggle-all', {
+            active: activeTodosCount === 0,
+          })}
+          data-cy="ToggleAllButton"
+          onClick={onToggleAll}
+        />
+      )}
+
+      <form onSubmit={onAddTodo}>
+        <input
+          data-cy="NewTodoField"
+          type="text"
+          className="todoapp__new-todo"
+          placeholder="What needs to be done?"
+          ref={titleField}
+          value={title}
+          onChange={e => setTitle(e.target.value)}
+          disabled={tempTodo !== null}
+        />
+      </form>
+    </header>
+  );
+};
diff --git a/src/components/TodoItem.tsx b/src/components/TodoItem.tsx
new file mode 100644
index 0000000000..a18f8b9b6f
--- /dev/null
+++ b/src/components/TodoItem.tsx
@@ -0,0 +1,129 @@
+/* eslint-disable jsx-a11y/label-has-associated-control */
+import React, { useState, useRef, useEffect } from 'react';
+import classNames from 'classnames';
+import { Todo } from '../types/Todo';
+
+type Props = {
+  todo: Todo;
+  isLoading?: boolean;
+  onDelete?: (id: number) => void;
+  onUpdate?: (id: number, data: Partial<Todo>) => Promise<void>;
+};
+
+export const TodoItem: React.FC<Props> = ({
+  todo,
+  isLoading,
+  onDelete,
+  onUpdate,
+}) => {
+  const [isEditing, setIsEditing] = useState(false);
+  const [newTitle, setNewTitle] = useState(todo.title);
+  const editField = useRef<HTMLInputElement>(null);
+
+  useEffect(() => {
+    if (isEditing && editField.current) {
+      editField.current.focus();
+    }
+  }, [isEditing]);
+
+  const handleSubmit = (e?: React.FormEvent) => {
+    e?.preventDefault();
+
+    if (isLoading) {
+      return;
+    }
+
+    const normalizedTitle = newTitle.trim();
+
+    if (normalizedTitle === todo.title) {
+      setIsEditing(false);
+
+      return;
+    }
+
+    if (!normalizedTitle) {
+      onDelete?.(todo.id);
+
+      return;
+    }
+
+    onUpdate?.(todo.id, { title: normalizedTitle })
+      ?.then(() => {
+        setIsEditing(false);
+      })
+      ?.catch(() => {
+        editField.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,
+        editing: isEditing,
+      })}
+    >
+      <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}
+          onChange={() => onUpdate?.(todo.id, { completed: !todo.completed })}
+        />
+      </label>
+
+      {isEditing ? (
+        <form onSubmit={handleSubmit}>
+          <input
+            data-cy="TodoTitleField"
+            type="text"
+            className="todo__title-field"
+            placeholder="Empty todo will be deleted"
+            ref={editField}
+            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)}
+        >
+          ×
+        </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..7058ddcc8c
--- /dev/null
+++ b/src/components/TodoList.tsx
@@ -0,0 +1,35 @@
+import React from 'react';
+import { Todo } from '../types/Todo';
+import { TodoItem } from './TodoItem';
+
+type Props = {
+  todos: Todo[];
+  onDelete?: (id: number) => void;
+  onUpdate?: (id: number, data: Partial<Todo>) => Promise<void>;
+  processingIds?: number[];
+  tempTodo?: Todo | null;
+};
+
+export const TodoList: React.FC<Props> = ({
+  todos,
+  onDelete,
+  onUpdate,
+  processingIds = [],
+  tempTodo,
+}) => {
+  return (
+    <section className="todoapp__main" data-cy="TodoList">
+      {todos.map(todo => (
+        <TodoItem
+          key={todo.id}
+          todo={todo}
+          onDelete={onDelete}
+          onUpdate={onUpdate}
+          isLoading={processingIds.includes(todo.id)}
+        />
+      ))}
+
+      {tempTodo && <TodoItem todo={tempTodo} isLoading={true} />}
+    </section>
+  );
+};
diff --git a/src/types/ErrorMessage.ts b/src/types/ErrorMessage.ts
new file mode 100644
index 0000000000..4d4347ca85
--- /dev/null
+++ b/src/types/ErrorMessage.ts
@@ -0,0 +1,7 @@
+export enum ErrorMessage {
+  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/types/Status.ts b/src/types/Status.ts
new file mode 100644
index 0000000000..2ec4b87141
--- /dev/null
+++ b/src/types/Status.ts
@@ -0,0 +1,5 @@
+export enum Status {
+  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'),
+};