diff --git a/README.md b/README.md
index 47a1add059..97801803fa 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://aholubko.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..900ed3ed66 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -1,26 +1,268 @@
-/* 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 React, { useEffect, useRef, useState } from 'react';
 import { UserWarning } from './UserWarning';
+import {
+  addTodo,
+  deleteTodo,
+  getTodos,
+  updateTodo,
+  USER_ID,
+} from './api/todos';
+import { Todo } from './types/Todo';
 
-const USER_ID = 0;
+import { FilterBy } from './types/FilterBy';
+import { TodoFooter } from './components/TodoFooter';
+import { ErrorNotification } from './components/ErrorNotification';
+import { TodoHeader } from './components/TodoHeader';
+import { TodoItem } from './components/TodoItem';
 
 export const App: React.FC = () => {
+  //#region State
+  const [todos, setTodos] = useState<Todo[]>([]);
+  const [filterBy, setFilterBy] = useState(FilterBy.All);
+  const [errorMessage, setErrorMessage] = useState('');
+
+  const [title, setTitle] = useState('');
+  const [tempTodo, setTempTodo] = useState<Todo | null>(null);
+  const [isAdding, setIsAdding] = useState(false);
+  const [processingIds, setProcessingIds] = useState<number[]>([]);
+  //#endregion
+
+  //#region Refs
+  const inputRef = useRef<HTMLInputElement>(null);
+  //#endregion
+
+  //#region Derived values
+  const activeTodosCount = todos.filter(todo => !todo.completed).length;
+  const completedTodosCount = todos.filter(todo => todo.completed).length;
+  const allCompleted = todos.length > 0 && activeTodosCount === 0;
+
+  let visibleTodos = todos;
+
+  if (filterBy === FilterBy.Active) {
+    visibleTodos = visibleTodos.filter(todo => !todo.completed);
+  }
+
+  if (filterBy === FilterBy.Completed) {
+    visibleTodos = visibleTodos.filter(todo => todo.completed);
+  }
+  //#endregion
+
+  //#region Handlers
+  const handleSubmit = (event: React.FormEvent) => {
+    event.preventDefault();
+
+    if (title.trim() === '') {
+      setErrorMessage('Title should not be empty');
+
+      return;
+    }
+
+    const newTempTodo = {
+      id: 0,
+      title: title.trim(),
+      completed: false,
+      userId: USER_ID,
+    };
+
+    setErrorMessage('');
+    setIsAdding(true);
+
+    setTempTodo(newTempTodo);
+
+    addTodo(title.trim())
+      .then(newTodo => {
+        setTodos(currentTodos => [...currentTodos, newTodo]);
+        setTitle('');
+        setTempTodo(null);
+      })
+      .catch(() => {
+        setErrorMessage('Unable to add a todo');
+        setTempTodo(null);
+      })
+      .finally(() => {
+        setIsAdding(false);
+        setTimeout(() => {
+          inputRef.current?.focus();
+        }, 0);
+      });
+  };
+
+  const handleDelete = (todoId: number) => {
+    setErrorMessage('');
+
+    setProcessingIds(currentIds => [...currentIds, todoId]);
+
+    return deleteTodo(todoId)
+      .then(() => {
+        setTodos(currentTodos =>
+          currentTodos.filter(todo => todo.id !== todoId),
+        );
+      })
+      .catch(() => {
+        setErrorMessage('Unable to delete a todo');
+      })
+      .finally(() => {
+        setProcessingIds(currentIds => currentIds.filter(id => id !== todoId));
+        setTimeout(() => {
+          inputRef.current?.focus();
+        }, 0);
+      });
+  };
+
+  const handleClearCompleted = () => {
+    const completedTodos = todos.filter(todo => todo.completed);
+
+    return Promise.all(completedTodos.map(todo => handleDelete(todo.id)));
+  };
+
+  const handleToggle = (todo: Todo) => {
+    const newCompletedStatus = !todo.completed;
+
+    setErrorMessage('');
+
+    setProcessingIds(currentIds => [...currentIds, todo.id]);
+
+    return updateTodo(todo.id, { completed: newCompletedStatus })
+      .then(updatedTodo => {
+        setTodos(currentTodos =>
+          currentTodos.map(currentTodo =>
+            currentTodo.id === todo.id ? updatedTodo : currentTodo,
+          ),
+        );
+      })
+      .catch(() => {
+        setErrorMessage('Unable to update a todo');
+      })
+      .finally(() => {
+        setProcessingIds(currentIds => currentIds.filter(id => id !== todo.id));
+      });
+  };
+
+  const handleToggleAll = () => {
+    const newCompletedStatus = !allCompleted;
+
+    const todosToUpdate = todos.filter(
+      todo => todo.completed !== newCompletedStatus,
+    );
+
+    return Promise.all(todosToUpdate.map(todo => handleToggle(todo)));
+  };
+
+  const handleUpdate = (todoId: number, newTitle: string) => {
+    setErrorMessage('');
+
+    setProcessingIds(currentIds => [...currentIds, todoId]);
+
+    return updateTodo(todoId, { title: newTitle })
+      .then(updatedTodo => {
+        setTodos(currentTodos =>
+          currentTodos.map(currentTodo =>
+            currentTodo.id === todoId ? updatedTodo : currentTodo,
+          ),
+        );
+      })
+      .catch(() => {
+        setErrorMessage('Unable to update a todo');
+
+        throw new Error();
+      })
+      .finally(() => {
+        setProcessingIds(currentIds => currentIds.filter(id => id !== todoId));
+      });
+  };
+
+  //#endregion
+
+  //#region Effects
+  useEffect(() => {
+    setErrorMessage('');
+
+    getTodos()
+      .then(setTodos)
+      .catch(() => setErrorMessage('Unable to load todos'));
+  }, []);
+
+  useEffect(() => {
+    inputRef.current?.focus();
+  }, []);
+
+  useEffect(() => {
+    if (!errorMessage) {
+      return;
+    }
+
+    const timerId = window.setTimeout(() => {
+      setErrorMessage('');
+    }, 3000);
+
+    return () => {
+      window.clearTimeout(timerId);
+    };
+  }, [errorMessage]);
+  //#endregion
+
   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">
+        <TodoHeader
+          allCompleted={allCompleted}
+          handleSubmit={handleSubmit}
+          title={title}
+          setTitle={setTitle}
+          isAdding={isAdding}
+          inputRef={inputRef}
+          handleToggleAll={handleToggleAll}
+          hasTodos={todos.length > 0}
+        />
+
+        {(todos.length > 0 || tempTodo) && (
+          <section className="todoapp__main" data-cy="TodoList">
+            {visibleTodos.map(todo => (
+              <TodoItem
+                key={todo.id}
+                todo={todo}
+                onDelete={handleDelete}
+                isProcessing={processingIds.includes(todo.id)}
+                onToggle={handleToggle}
+                onUpdate={handleUpdate}
+              />
+            ))}
+
+            {tempTodo && (
+              <TodoItem
+                todo={tempTodo}
+                onDelete={handleDelete}
+                isProcessing
+                onToggle={handleToggle}
+                onUpdate={handleUpdate}
+              />
+            )}
+          </section>
+        )}
+
+        {todos.length > 0 && (
+          <TodoFooter
+            activeTodosCount={activeTodosCount}
+            completedTodosCount={completedTodosCount}
+            filterBy={filterBy}
+            setFilterBy={setFilterBy}
+            handleClearCompleted={handleClearCompleted}
+          />
+        )}
+      </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..afb17b79e6
--- /dev/null
+++ b/src/api/todos.ts
@@ -0,0 +1,25 @@
+import { Todo } from '../types/Todo';
+import { client } from '../utils/fetchClient';
+
+export const USER_ID = 4192;
+
+export const getTodos = () => {
+  return client.get<Todo[]>(`/todos?userId=${USER_ID}`);
+};
+
+// Add more methods here
+export const addTodo = (title: string) => {
+  return client.post<Todo>('/todos', {
+    userId: USER_ID,
+    title: title.trim(),
+    completed: false,
+  });
+};
+
+export const deleteTodo = (todoId: number) => {
+  return client.delete(`/todos/${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..0c802b6820
--- /dev/null
+++ b/src/components/ErrorNotification.tsx
@@ -0,0 +1,32 @@
+import React from 'react';
+import classNames from 'classnames';
+
+type Props = {
+  errorMessage: string;
+  setErrorMessage: (value: string) => void;
+};
+
+export const ErrorNotification: React.FC<Props> = ({
+  errorMessage,
+  setErrorMessage,
+}) => {
+  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={() => setErrorMessage('')}
+      />
+      {errorMessage}
+    </div>
+  );
+};
diff --git a/src/components/TodoFooter.tsx b/src/components/TodoFooter.tsx
new file mode 100644
index 0000000000..bd5599f630
--- /dev/null
+++ b/src/components/TodoFooter.tsx
@@ -0,0 +1,79 @@
+import React from 'react';
+import classNames from 'classnames';
+import { FilterBy } from '../types/FilterBy';
+
+type Props = {
+  activeTodosCount: number;
+  completedTodosCount: number;
+  filterBy: FilterBy;
+  setFilterBy: (filterBy: FilterBy) => void;
+  handleClearCompleted: () => void;
+};
+
+export const TodoFooter: React.FC<Props> = ({
+  activeTodosCount,
+  completedTodosCount,
+  filterBy,
+  setFilterBy,
+  handleClearCompleted,
+}) => {
+  const filters = [
+    {
+      title: 'All',
+      href: '#/',
+      dataCy: 'FilterLinkAll',
+      value: FilterBy.All,
+    },
+
+    {
+      title: 'Active',
+      href: '#/active',
+      dataCy: 'FilterLinkActive',
+      value: FilterBy.Active,
+    },
+
+    {
+      title: 'Completed',
+      href: '#/completed',
+      dataCy: 'FilterLinkCompleted',
+      value: FilterBy.Completed,
+    },
+  ];
+
+  return (
+    <footer className="todoapp__footer" data-cy="Footer">
+      <span className="todo-count" data-cy="TodosCounter">
+        {activeTodosCount} items left
+      </span>
+
+      <nav className="filter" data-cy="Filter">
+        {filters.map(filter => (
+          <a
+            key={filter.value}
+            href={filter.href}
+            className={classNames('filter__link', {
+              selected: filterBy === filter.value,
+            })}
+            data-cy={filter.dataCy}
+            onClick={e => {
+              e.preventDefault();
+              setFilterBy(filter.value);
+            }}
+          >
+            {filter.title}
+          </a>
+        ))}
+      </nav>
+
+      <button
+        type="button"
+        className="todoapp__clear-completed"
+        data-cy="ClearCompletedButton"
+        disabled={completedTodosCount === 0}
+        onClick={handleClearCompleted}
+      >
+        Clear completed
+      </button>
+    </footer>
+  );
+};
diff --git a/src/components/TodoHeader.tsx b/src/components/TodoHeader.tsx
new file mode 100644
index 0000000000..e708375ce9
--- /dev/null
+++ b/src/components/TodoHeader.tsx
@@ -0,0 +1,52 @@
+import React from 'react';
+import classNames from 'classnames';
+
+type Props = {
+  allCompleted: boolean;
+  handleSubmit: (event: React.FormEvent) => void;
+  title: string;
+  setTitle: (value: string) => void;
+  isAdding: boolean;
+  inputRef: React.RefObject<HTMLInputElement>;
+  handleToggleAll: () => void;
+  hasTodos: boolean;
+};
+
+export const TodoHeader: React.FC<Props> = ({
+  allCompleted,
+  handleSubmit,
+  title,
+  setTitle,
+  isAdding,
+  inputRef,
+  handleToggleAll,
+  hasTodos,
+}) => {
+  return (
+    <header className="todoapp__header">
+      {hasTodos && (
+        <button
+          type="button"
+          className={classNames('todoapp__toggle-all', {
+            active: allCompleted,
+          })}
+          data-cy="ToggleAllButton"
+          onClick={handleToggleAll}
+        />
+      )}
+
+      <form onSubmit={handleSubmit}>
+        <input
+          data-cy="NewTodoField"
+          type="text"
+          className="todoapp__new-todo"
+          placeholder="What needs to be done?"
+          value={title}
+          onChange={e => setTitle(e.target.value)}
+          disabled={isAdding}
+          ref={inputRef}
+        />
+      </form>
+    </header>
+  );
+};
diff --git a/src/components/TodoItem.tsx b/src/components/TodoItem.tsx
new file mode 100644
index 0000000000..9d5f877d4e
--- /dev/null
+++ b/src/components/TodoItem.tsx
@@ -0,0 +1,126 @@
+/* eslint-disable jsx-a11y/label-has-associated-control */
+import React, { useEffect, useRef, useState } from 'react';
+import classNames from 'classnames';
+import { Todo } from '../types/Todo';
+
+type Props = {
+  todo: Todo;
+  onDelete: (todoId: number) => void;
+  isProcessing: boolean;
+  onToggle: (todo: Todo) => void;
+  onUpdate: (todoId: number, newTitle: string) => Promise<void>;
+};
+
+export const TodoItem: React.FC<Props> = ({
+  todo,
+  onDelete,
+  isProcessing,
+  onToggle,
+  onUpdate,
+}) => {
+  const [isEditing, setIsEdititng] = useState(false);
+  const [newTitle, setNewTitle] = useState(todo.title);
+
+  const editInputRef = useRef<HTMLInputElement>(null);
+
+  const handleRename = () => {
+    const trimmedTitle = newTitle.trim();
+
+    if (trimmedTitle === todo.title) {
+      setIsEdititng(false);
+
+      return;
+    }
+
+    if (trimmedTitle === '') {
+      onDelete(todo.id);
+
+      return;
+    }
+
+    onUpdate(todo.id, trimmedTitle).then(() => {
+      setIsEdititng(false);
+    });
+  };
+
+  useEffect(() => {
+    if (isEditing) {
+      editInputRef.current?.focus();
+      editInputRef.current?.select();
+    }
+  }, [isEditing]);
+
+  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={() => onToggle(todo)}
+        />
+      </label>
+
+      {!isEditing ? (
+        <>
+          <span
+            data-cy="TodoTitle"
+            className="todo__title"
+            onDoubleClick={() => setIsEdititng(true)}
+          >
+            {todo.title}
+          </span>
+
+          <button
+            type="button"
+            className="todo__remove"
+            data-cy="TodoDelete"
+            onClick={() => onDelete(todo.id)}
+          >
+            ×
+          </button>
+        </>
+      ) : (
+        <form
+          onSubmit={event => {
+            event.preventDefault();
+            handleRename();
+          }}
+        >
+          <input
+            data-cy="TodoTitleField"
+            type="text"
+            className="todo__title-field"
+            placeholder="Empty todo will be deleted"
+            value={newTitle}
+            onChange={e => setNewTitle(e.target.value)}
+            onBlur={handleRename}
+            onKeyDown={event => {
+              if (event.key === 'Escape') {
+                setNewTitle(todo.title);
+                setIsEdititng(false);
+              }
+            }}
+            ref={editInputRef}
+          />
+        </form>
+      )}
+
+      <div
+        data-cy="TodoLoader"
+        className={classNames('modal overlay', {
+          'is-active': isProcessing,
+        })}
+      >
+        <div className="modal-background has-background-white-ter" />
+        <div className="loader" />
+      </div>
+    </div>
+  );
+};
diff --git a/src/types/FilterBy.ts b/src/types/FilterBy.ts
new file mode 100644
index 0000000000..088e9526ce
--- /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 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'),
+};
diff --git a/tsconfig.json b/tsconfig.json
index cfb168bb26..5d2a3022d2 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -1,10 +1,17 @@
 {
-  "extends": "@mate-academy/students-ts-config",
-  "include": [
-    "src"
-  ],
   "compilerOptions": {
-    "sourceMap": false,
-    "types": ["node", "cypress"]
-  }
-}
+    "target": "ES2020",
+    "useDefineForClassFields": true,
+    "lib": ["ES2020", "DOM", "DOM.Iterable"],
+    "module": "ESNext",
+    "skipLibCheck": true,
+    "moduleResolution": "Bundler",
+    "allowImportingTsExtensions": false,
+    "resolveJsonModule": true,
+    "isolatedModules": true,
+    "noEmit": true,
+    "jsx": "react-jsx",
+    "strict": true
+  },
+  "include": ["src"]
+}
\ No newline at end of file