diff --git a/README.md b/README.md
index 47a1add059..dce71dfe50 100644
--- a/README.md
+++ b/README.md
@@ -10,6 +10,7 @@ and implement the ability to toggle and rename todos.
 ## Toggling a todo status
 
 Toggle the `completed` status on `TodoStatus` change:
+
 - Install Prettier Extention and use this [VSCode settings](https://mate-academy.github.io/fe-program/tools/vscode/settings.json) to enable format on save.
 - covered the todo with a loader overlay while waiting for API response;
 - the status should be changed on success;
@@ -38,6 +39,7 @@ Implement the ability to edit a todo title on double click:
 - or the deletion error message if we tried to delete the todo.
 
 ## If you want to enable tests
+
 - open `cypress/integration/page.spec.js`
 - replace `describe.skip` with `describe` for the root `describe`
 
@@ -47,4 +49,4 @@ 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://A1daros.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..da537b9871 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -1,26 +1,81 @@
-/* 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, { useState } from 'react';
+
 import { UserWarning } from './UserWarning';
+import { TodoList } from './components/TodoList';
+import { Header } from './components/Header';
+import { Footer } from './components/Footer';
+import { ErrorNotification } from './components/ErrorNotificaton';
+
+import { FilterStatus } from './types/types';
+import { USER_ID } from './api/todos';
 
-const USER_ID = 0;
+import { useErrorMessage } from './hooks/useErrorMessage';
+import { useTodos } from './hooks/useTodos';
+import { getVisibleTodos } from './utils/todoUtils';
 
 export const App: React.FC = () => {
+  const [filter, setFilter] = useState<FilterStatus>(FilterStatus.All);
+  const [error, setError] = useErrorMessage();
+
+  const {
+    todos,
+    tempTodo,
+    deletingId,
+    loadingId,
+    addTodo,
+    removeTodo,
+    renameTodo,
+    clearCompleted,
+    toggleAll,
+    toggleTodo,
+    isAllCompleted,
+  } = useTodos(setError);
+
+  const visibleTodos = getVisibleTodos(todos, filter);
+
   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
+          onAdd={addTodo}
+          onError={setError}
+          loading={!!tempTodo || deletingId.length > 0}
+          isAllCompleted={isAllCompleted}
+          onToggleAll={toggleAll}
+          hasTodos={todos.length > 0}
+        />
+
+        {(!!todos.length || tempTodo) && (
+          <TodoList
+            todos={visibleTodos}
+            onToggle={toggleTodo}
+            tempTodo={tempTodo}
+            deletingId={deletingId}
+            loadingId={loadingId}
+            onDelete={removeTodo}
+            onRename={renameTodo}
+          />
+        )}
+
+        {todos.length > 0 && (
+          <Footer
+            todos={todos}
+            filter={filter}
+            onFilterChange={setFilter}
+            onClearCompleted={clearCompleted}
+          />
+        )}
+      </div>
+
+      <ErrorNotification error={error} onErrorClose={() => setError(null)} />
+    </div>
   );
 };
diff --git a/src/api/todos.ts b/src/api/todos.ts
new file mode 100644
index 0000000000..5aa60f523c
--- /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 = 4182;
+
+export const getTodos = () => {
+  return client.get<Todo[]>(`/todos?userId=${USER_ID}`);
+};
+
+export const createTodo = (data: Omit<Todo, 'id'>) => {
+  return client.post<Todo>('/todos', data);
+};
+
+export const deleteTodo = (todoId: number) => {
+  return client.delete(`/todos/${todoId}`);
+};
+
+export const updateTodo = (todoId: number, data: Partial<Todo>) => {
+  return client.patch<Todo>(`/todos/${todoId}`, data);
+};
diff --git a/src/components/ErrorNotificaton.tsx b/src/components/ErrorNotificaton.tsx
new file mode 100644
index 0000000000..3f0e0bc5f5
--- /dev/null
+++ b/src/components/ErrorNotificaton.tsx
@@ -0,0 +1,30 @@
+import React from 'react';
+import cn from 'classnames';
+
+type Props = {
+  error: string | null;
+  onErrorClose: () => void;
+};
+
+export const ErrorNotification: React.FC<Props> = ({ error, onErrorClose }) => {
+  return (
+    <div
+      data-cy="ErrorNotification"
+      className={cn(
+        'notification',
+        'is-danger',
+        'is-light',
+        'has-text-weight-normal',
+        { hidden: !error },
+      )}
+    >
+      <button
+        data-cy="HideErrorButton"
+        type="button"
+        className="delete"
+        onClick={onErrorClose}
+      />
+      {error}
+    </div>
+  );
+};
diff --git a/src/components/Footer.tsx b/src/components/Footer.tsx
new file mode 100644
index 0000000000..23dcf39447
--- /dev/null
+++ b/src/components/Footer.tsx
@@ -0,0 +1,63 @@
+import React from 'react';
+import { Todo } from '../types/Todo';
+import cn from 'classnames';
+import { FilterStatus } from '../types/types';
+import { FILTERS } from '../constants';
+
+type Props = {
+  todos: Todo[];
+  filter: FilterStatus;
+  onFilterChange: (status: FilterStatus) => void;
+  onClearCompleted: () => void;
+};
+
+export const Footer: React.FC<Props> = ({
+  todos,
+  filter,
+  onFilterChange,
+  onClearCompleted,
+}) => {
+  if (todos.length === 0) {
+    return null;
+  }
+
+  const activeTodos = todos.filter(todo => !todo.completed).length;
+
+  const handleFilterClick =
+    (status: FilterStatus) => (event: React.MouseEvent) => {
+      event.preventDefault();
+      onFilterChange(status);
+    };
+
+  return (
+    <footer className="todoapp__footer" data-cy="Footer">
+      <span className="todo-count" data-cy="TodosCounter">
+        {`${activeTodos} items left`}
+      </span>
+
+      <nav className="filter" data-cy="Filter">
+        {FILTERS.map(({ id, title, url, cy }) => (
+          <a
+            key={id}
+            href={url}
+            className={cn('filter__link', { selected: filter === id })}
+            data-cy={cy}
+            onClick={handleFilterClick(id)}
+          >
+            {title}
+          </a>
+        ))}
+      </nav>
+
+      <button
+        type="button"
+        className="todoapp__clear-completed"
+        data-cy="ClearCompletedButton"
+        disabled={todos.length - activeTodos === 0}
+        onClick={onClearCompleted}
+      >
+        Clear completed
+      </button>
+    </footer>
+  );
+};
diff --git a/src/components/Header.tsx b/src/components/Header.tsx
new file mode 100644
index 0000000000..5bf8fe264f
--- /dev/null
+++ b/src/components/Header.tsx
@@ -0,0 +1,80 @@
+import React, { useEffect, useState } from 'react';
+import { ErrorMessage } from '../types/types';
+
+type Props = {
+  onAdd: (title: string) => Promise<void>;
+  onError: (message: string) => void;
+  loading: boolean;
+  isAllCompleted: boolean;
+  onToggleAll: () => void;
+  hasTodos: boolean;
+};
+
+export const Header: React.FC<Props> = ({
+  onAdd,
+  onError,
+  loading,
+  isAllCompleted,
+  onToggleAll,
+  hasTodos,
+}) => {
+  const [title, setTitle] = useState('');
+  const [disabled, setDisabled] = useState(false);
+
+  const inputRef = React.useRef<HTMLInputElement>(null);
+
+  useEffect(() => {
+    if (!loading) {
+      inputRef.current?.focus();
+    }
+  }, [loading]);
+
+  const handleSubmit = async (event: React.FormEvent) => {
+    event.preventDefault();
+    const trimmedTitle = title.trim();
+
+    if (!trimmedTitle) {
+      onError(ErrorMessage.EmptyTitle);
+
+      return;
+    }
+
+    setDisabled(true);
+    onError('');
+
+    try {
+      await onAdd(trimmedTitle);
+      setTitle('');
+    } catch {
+    } finally {
+      setDisabled(false);
+      inputRef.current?.focus();
+    }
+  };
+
+  return (
+    <header className="todoapp__header">
+      {hasTodos && (
+        <button
+          type="button"
+          className={`todoapp__toggle-all ${isAllCompleted ? 'active' : ''}`}
+          data-cy="ToggleAllButton"
+          onClick={onToggleAll}
+        />
+      )}
+
+      <form onSubmit={handleSubmit}>
+        <input
+          ref={inputRef}
+          disabled={disabled}
+          value={title}
+          onChange={event => setTitle(event.target.value)}
+          data-cy="NewTodoField"
+          type="text"
+          className="todoapp__new-todo"
+          placeholder="What needs to be done?"
+        />
+      </form>
+    </header>
+  );
+};
diff --git a/src/components/TodoItem.tsx b/src/components/TodoItem.tsx
new file mode 100644
index 0000000000..e16b8dc6b4
--- /dev/null
+++ b/src/components/TodoItem.tsx
@@ -0,0 +1,124 @@
+import React, { useEffect, useRef, useState } from 'react';
+import { Todo } from '../types/Todo';
+import cn from 'classnames';
+
+type Props = {
+  todo: Todo;
+  isDeleting?: boolean;
+  isLoading?: boolean;
+  onDelete?: (id: number) => void;
+  onToggle?: (id: number) => void;
+  onRename?: (id: number, title: string) => void;
+};
+
+export const TodoItem: React.FC<Props> = ({
+  todo,
+  isDeleting = false,
+  isLoading = false,
+  onDelete,
+  onToggle,
+  onRename,
+}) => {
+  const [isEditing, setIsEditing] = useState(false);
+  const [newTitle, setNewTitle] = useState(todo.title);
+  const editInputRef = useRef<HTMLInputElement>(null);
+
+  useEffect(() => {
+    if (isEditing) {
+      editInputRef.current?.focus();
+    }
+  }, [isEditing]);
+
+  const handleSubmit = async (event: React.FormEvent) => {
+    event.preventDefault();
+
+    const trimmedTitle = newTitle.trim();
+
+    if (trimmedTitle === todo.title) {
+      setIsEditing(false);
+
+      return;
+    }
+
+    if (!trimmedTitle) {
+      onDelete?.(todo.id);
+
+      return;
+    }
+
+    try {
+      await onRename?.(todo.id, trimmedTitle);
+      setIsEditing(false);
+    } catch {}
+  };
+
+  const handleKeyUp = (event: React.KeyboardEvent) => {
+    if (event.key === 'Escape') {
+      setNewTitle(todo.title);
+      setIsEditing(false);
+    }
+  };
+
+  return (
+    <div
+      data-cy="Todo"
+      className={cn('todo', { completed: todo.completed, editing: isEditing })}
+    >
+      <label className="todo__status-label">
+        <input
+          data-cy="TodoStatus"
+          type="checkbox"
+          className="todo__status"
+          aria-label="Toggle todo status"
+          checked={todo.completed}
+          onChange={() => onToggle?.(todo.id)}
+        />
+      </label>
+
+      {isEditing ? (
+        <form onSubmit={handleSubmit}>
+          <input
+            data-cy="TodoTitleField"
+            type="text"
+            className="todo__edit"
+            ref={editInputRef}
+            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>
+          {!isLoading && (
+            <button
+              type="button"
+              className="todo__remove"
+              data-cy="TodoDelete"
+              onClick={() => onDelete?.(todo.id)}
+            >
+              ×
+            </button>
+          )}
+        </>
+      )}
+
+      <div
+        data-cy="TodoLoader"
+        className={cn('modal', 'overlay', {
+          'is-active': isDeleting || 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..efb5760348
--- /dev/null
+++ b/src/components/TodoList.tsx
@@ -0,0 +1,41 @@
+import React from 'react';
+import { Todo } from '../types/Todo';
+import { TodoItem } from './TodoItem';
+
+type Props = {
+  todos: Todo[];
+  tempTodo: Todo | null;
+  deletingId: number[];
+  loadingId: number[];
+  onDelete: (id: number) => void;
+  onToggle: (id: number) => void;
+  onRename: (id: number, title: string) => void;
+};
+
+export const TodoList: React.FC<Props> = ({
+  todos,
+  tempTodo,
+  deletingId,
+  loadingId,
+  onDelete,
+  onToggle,
+  onRename,
+}) => {
+  return (
+    <section className="todoapp__main" data-cy="TodoList">
+      {todos.map(todo => (
+        <TodoItem
+          key={todo.id}
+          todo={todo}
+          onToggle={onToggle}
+          isDeleting={deletingId.includes(todo.id)}
+          isLoading={loadingId.includes(todo.id)}
+          onDelete={onDelete}
+          onRename={onRename}
+        />
+      ))}
+
+      {tempTodo && <TodoItem todo={tempTodo} isLoading={true} />}
+    </section>
+  );
+};
diff --git a/src/constants.ts b/src/constants.ts
new file mode 100644
index 0000000000..839f21b124
--- /dev/null
+++ b/src/constants.ts
@@ -0,0 +1,22 @@
+import { FilterStatus } from './types/types';
+
+export const FILTERS = [
+  {
+    id: 'all' as FilterStatus,
+    title: 'All',
+    url: '#/',
+    cy: 'FilterLinkAll',
+  },
+  {
+    id: 'active' as FilterStatus,
+    title: 'Active',
+    url: '#/active',
+    cy: 'FilterLinkActive',
+  },
+  {
+    id: 'completed' as FilterStatus,
+    title: 'Completed',
+    url: '#/completed',
+    cy: 'FilterLinkCompleted',
+  },
+];
diff --git a/src/hooks/useErrorMessage.ts b/src/hooks/useErrorMessage.ts
new file mode 100644
index 0000000000..69ac9353cf
--- /dev/null
+++ b/src/hooks/useErrorMessage.ts
@@ -0,0 +1,17 @@
+import { useEffect, useState } from 'react';
+
+export const useErrorMessage = (delay = 3000) => {
+  const [error, setError] = useState<string | null>(null);
+
+  useEffect(() => {
+    if (!error) {
+      return;
+    }
+
+    const timer = setTimeout(() => setError(null), delay);
+
+    return () => clearTimeout(timer);
+  }, [error, delay]);
+
+  return [error, setError] as const;
+};
diff --git a/src/hooks/useTodos.ts b/src/hooks/useTodos.ts
new file mode 100644
index 0000000000..92ab9bfc4f
--- /dev/null
+++ b/src/hooks/useTodos.ts
@@ -0,0 +1,156 @@
+import { useEffect, useState } from 'react';
+import { Todo } from '../types/Todo';
+import { ErrorMessage } from '../types/types';
+import {
+  createTodo,
+  deleteTodo,
+  getTodos,
+  updateTodo,
+  USER_ID,
+} from '../api/todos';
+
+export const useTodos = (onError: (message: string) => void) => {
+  const [todos, setTodos] = useState<Todo[]>([]);
+  const [tempTodo, setTempTodo] = useState<Todo | null>(null);
+  const [deletingId, setDeletingId] = useState<number[]>([]);
+  const [loadingId, setLoadingId] = useState<number[]>([]);
+
+  useEffect(() => {
+    getTodos()
+      .then(setTodos)
+      .catch(() => onError(ErrorMessage.LoadTodo));
+  }, [onError]);
+
+  const addTodo = async (title: string) => {
+    const trimmedTitle = title.trim();
+
+    setTempTodo({
+      id: 0,
+      title: trimmedTitle,
+      completed: false,
+      userId: USER_ID,
+    });
+
+    try {
+      const newTodo = await createTodo({
+        title: trimmedTitle,
+        completed: false,
+        userId: USER_ID,
+      });
+
+      setTodos(prev => [...prev, newTodo]);
+    } catch {
+      onError(ErrorMessage.AddTodo);
+      throw new Error();
+    } finally {
+      setTempTodo(null);
+    }
+  };
+
+  const removeTodo = async (todoId: number) => {
+    setDeletingId(prev => [...prev, todoId]);
+
+    try {
+      await deleteTodo(todoId);
+      setTodos(prev => prev.filter(todo => todo.id !== todoId));
+    } catch {
+      onError(ErrorMessage.DeleteTodo);
+    } finally {
+      setDeletingId(prev => prev.filter(id => id !== todoId));
+    }
+  };
+
+  const renameTodo = async (todoId: number, title: string) => {
+    setLoadingId(prev => [...prev, todoId]);
+
+    try {
+      await updateTodo(todoId, { title });
+      setTodos(prev =>
+        prev.map(todo => (todo.id === todoId ? { ...todo, title } : todo)),
+      );
+    } catch {
+      onError(ErrorMessage.UpdateTodo);
+      throw new Error();
+    } finally {
+      setLoadingId(prev => prev.filter(id => id !== todoId));
+    }
+  };
+
+  const clearCompleted = async () => {
+    const completedTodos = todos.filter(todo => todo.completed);
+
+    await Promise.all(completedTodos.map(todo => removeTodo(todo.id)));
+  };
+
+  const isAllCompleted =
+    todos.length > 0 && todos.every(todo => todo.completed);
+
+  const toggleAll = async () => {
+    const areAllCompleted = todos.every(todo => todo.completed);
+    const targetStatus = !areAllCompleted;
+    const todosToUpdate = todos.filter(todo => todo.completed !== targetStatus);
+
+    const idToUpdate = todosToUpdate.map(todo => todo.id);
+
+    setLoadingId(prev => [...prev, ...idToUpdate]);
+
+    try {
+      await Promise.all(
+        todosToUpdate.map(todo =>
+          updateTodo(todo.id, { completed: targetStatus }),
+        ),
+      );
+      setTodos(prev =>
+        prev.map(todo =>
+          idToUpdate.includes(todo.id)
+            ? { ...todo, completed: targetStatus }
+            : todo,
+        ),
+      );
+    } catch {
+      onError(ErrorMessage.UpdateTodo);
+    } finally {
+      setLoadingId(prev => prev.filter(id => !idToUpdate.includes(id)));
+    }
+  };
+
+  const toggleTodo = async (todoId: number) => {
+    const todo = todos.find(TODO => TODO.id === todoId);
+
+    if (!todo) {
+      return;
+    }
+
+    const newCompleted = !todo.completed;
+
+    setLoadingId(prev => [...prev, todo.id]);
+
+    try {
+      await updateTodo(todo.id, { completed: newCompleted });
+      setTodos(prev =>
+        prev.map(t =>
+          t.id === todo.id ? { ...t, completed: newCompleted } : t,
+        ),
+      );
+    } catch {
+      onError(ErrorMessage.UpdateTodo);
+    } finally {
+      setLoadingId(prev => prev.filter(id => id !== todo.id));
+    }
+  };
+
+  return {
+    todos,
+    tempTodo,
+    deletingId,
+    isAllCompleted,
+    loadingId,
+    addTodo,
+    removeTodo,
+    clearCompleted,
+    toggleAll,
+    toggleTodo,
+    renameTodo,
+    setTodos,
+  };
+};
diff --git a/src/styles/todo.scss b/src/styles/todo.scss
index c7f93ff6b9..b26146533c 100644
--- a/src/styles/todo.scss
+++ b/src/styles/todo.scss
@@ -15,13 +15,13 @@
 
   &__status-label {
     cursor: pointer;
-    background-image: url("data:image/svg+xml;utf8,%3Csvg%20xmlns%3D%22http%3A//www.w3.org/2000/svg%22%20width%3D%2240%22%20height%3D%2240%22%20viewBox%3D%22-10%20-18%20100%20135%22%3E%3Ccircle%20cx%3D%2250%22%20cy%3D%2250%22%20r%3D%2250%22%20fill%3D%22none%22%20stroke%3D%22%23ededed%22%20stroke-width%3D%223%22/%3E%3C/svg%3E");
+    background-image: url('data:image/svg+xml;utf8,%3Csvg%20xmlns%3D%22http%3A//www.w3.org/2000/svg%22%20width%3D%2240%22%20height%3D%2240%22%20viewBox%3D%22-10%20-18%20100%20135%22%3E%3Ccircle%20cx%3D%2250%22%20cy%3D%2250%22%20r%3D%2250%22%20fill%3D%22none%22%20stroke%3D%22%23ededed%22%20stroke-width%3D%223%22/%3E%3C/svg%3E');
     background-repeat: no-repeat;
     background-position: center left;
   }
 
   &.completed &__status-label {
-    background-image: url("data:image/svg+xml;utf8,%3Csvg%20xmlns%3D%22http%3A//www.w3.org/2000/svg%22%20width%3D%2240%22%20height%3D%2240%22%20viewBox%3D%22-10%20-18%20100%20135%22%3E%3Ccircle%20cx%3D%2250%22%20cy%3D%2250%22%20r%3D%2250%22%20fill%3D%22none%22%20stroke%3D%22%23bddad5%22%20stroke-width%3D%223%22/%3E%3Cpath%20fill%3D%22%235dc2af%22%20d%3D%22M72%2025L42%2071%2027%2056l-4%204%2020%2020%2034-52z%22/%3E%3C/svg%3E");
+    background-image: url('data:image/svg+xml;utf8,%3Csvg%20xmlns%3D%22http%3A//www.w3.org/2000/svg%22%20width%3D%2240%22%20height%3D%2240%22%20viewBox%3D%22-10%20-18%20100%20135%22%3E%3Ccircle%20cx%3D%2250%22%20cy%3D%2250%22%20r%3D%2250%22%20fill%3D%22none%22%20stroke%3D%22%23bddad5%22%20stroke-width%3D%223%22/%3E%3Cpath%20fill%3D%22%235dc2af%22%20d%3D%22M72%2025L42%2071%2027%2056l-4%204%2020%2020%2034-52z%22/%3E%3C/svg%3E');
   }
 
   &__status {
@@ -40,6 +40,14 @@
     text-decoration: line-through;
   }
 
+  &__edit {
+    width: 100%;
+    padding: 10px;
+    font-size: inherit;
+    line-height: inherit;
+    box-sizing: border-box;
+  }
+
   &__remove {
     position: absolute;
     right: 12px;
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/types/types.ts b/src/types/types.ts
new file mode 100644
index 0000000000..719a0780a9
--- /dev/null
+++ b/src/types/types.ts
@@ -0,0 +1,13 @@
+export enum FilterStatus {
+  All = 'all',
+  Active = 'active',
+  Completed = 'completed',
+}
+
+export enum ErrorMessage {
+  LoadTodo = '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/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/src/utils/todoUtils.ts b/src/utils/todoUtils.ts
new file mode 100644
index 0000000000..4f6f0842b9
--- /dev/null
+++ b/src/utils/todoUtils.ts
@@ -0,0 +1,13 @@
+import { Todo } from '../types/Todo';
+import { FilterStatus } from '../types/types';
+
+export const getVisibleTodos = (todos: Todo[], filter: FilterStatus) => {
+  switch (filter) {
+    case FilterStatus.Active:
+      return todos.filter(todo => !todo.completed);
+    case FilterStatus.Completed:
+      return todos.filter(todo => todo.completed);
+    default:
+      return todos;
+  }
+};