diff --git a/src/App.tsx b/src/App.tsx
index a399287bd..c43e347f8 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -1,157 +1,85 @@
 /* eslint-disable jsx-a11y/control-has-associated-label */
-import React from 'react';
+import React, { useEffect } from 'react';
+import { UserWarning } from './UserWarning';
+import { getTodos } from './api/todos';
+import { Header } from './components/Header';
+import { Footer } from './components/Footer';
+import { Filter } from './types/Filter';
+import { TodoItem } from './components/TodoItem';
+import { focusInput } from './utils/services';
+import { ErrNotification } from './components/ErrNotification';
+import { useTodoContext } from './components/TodoContext';
+import { USER_ID } from './utils/constants';
 
 export const App: React.FC = () => {
+  const {
+    todos,
+    setTodos,
+    isLoading,
+    setIsLoading,
+    activeTodoId,
+    isSubmitting,
+    tempTodo,
+    inputRef,
+    filter,
+    showError,
+  } = useTodoContext();
+
+  useEffect(() => {
+    const fetchTodos = async () => {
+      setIsLoading(true);
+      try {
+        const fetchedTodos = await getTodos(USER_ID);
+
+        setTodos(fetchedTodos);
+      } catch {
+        showError('Unable to load todos');
+      } finally {
+        setIsLoading(false);
+      }
+    };
+
+    fetchTodos();
+  }, []);
+
+  useEffect(() => {
+    focusInput(inputRef);
+  }, [isSubmitting, activeTodoId, inputRef]);
+
+  const filteredTodos = todos.filter(todo => {
+    switch (filter) {
+      case Filter.Active:
+        return !todo.completed;
+      case Filter.Completed:
+        return todo.completed;
+      default:
+        return true;
+    }
+  });
+
+  if (!USER_ID) {
+    return <UserWarning />;
+  }
+
   return (
     <div className="todoapp">
       <h1 className="todoapp__title">todos</h1>
 
       <div className="todoapp__content">
-        <header className="todoapp__header">
-          {/* this button should have `active` class only if all todos are completed */}
-          <button
-            type="button"
-            className="todoapp__toggle-all active"
-            data-cy="ToggleAllButton"
-          />
-
-          {/* Add a todo on form submit */}
-          <form>
-            <input
-              data-cy="NewTodoField"
-              type="text"
-              className="todoapp__new-todo"
-              placeholder="What needs to be done?"
-            />
-          </form>
-        </header>
-
-        <section className="todoapp__main" data-cy="TodoList">
-          {/* This is a completed todo */}
-          <div data-cy="Todo" className="todo completed">
-            <label className="todo__status-label">
-              <input
-                data-cy="TodoStatus"
-                type="checkbox"
-                className="todo__status"
-                checked
-              />
-            </label>
-
-            <span data-cy="TodoTitle" className="todo__title">
-              Completed Todo
-            </span>
-
-            {/* Remove button appears only on hover */}
-            <button type="button" className="todo__remove" data-cy="TodoDelete">
-              ×
-            </button>
-          </div>
-
-          {/* This todo is an active todo */}
-          <div data-cy="Todo" className="todo">
-            <label className="todo__status-label">
-              <input
-                data-cy="TodoStatus"
-                type="checkbox"
-                className="todo__status"
-              />
-            </label>
-
-            <span data-cy="TodoTitle" className="todo__title">
-              Not Completed Todo
-            </span>
-
-            <button type="button" className="todo__remove" data-cy="TodoDelete">
-              ×
-            </button>
-          </div>
-
-          {/* This todo is being edited */}
-          <div data-cy="Todo" className="todo">
-            <label className="todo__status-label">
-              <input
-                data-cy="TodoStatus"
-                type="checkbox"
-                className="todo__status"
-              />
-            </label>
-
-            {/* This form is shown instead of the title and remove button */}
-            <form>
-              <input
-                data-cy="TodoTitleField"
-                type="text"
-                className="todo__title-field"
-                placeholder="Empty todo will be deleted"
-                value="Todo is being edited now"
-              />
-            </form>
-          </div>
-
-          {/* This todo is in loadind state */}
-          <div data-cy="Todo" className="todo">
-            <label className="todo__status-label">
-              <input
-                data-cy="TodoStatus"
-                type="checkbox"
-                className="todo__status"
-              />
-            </label>
-
-            <span data-cy="TodoTitle" className="todo__title">
-              Todo is being saved now
-            </span>
-
-            <button type="button" className="todo__remove" data-cy="TodoDelete">
-              ×
-            </button>
-          </div>
-        </section>
-
-        {/* Hide the footer if there are no todos */}
-        <footer className="todoapp__footer" data-cy="Footer">
-          <span className="todo-count" data-cy="TodosCounter">
-            3 items left
-          </span>
-
-          {/* Active link should have the 'selected' class */}
-          <nav className="filter" data-cy="Filter">
-            <a
-              href="#/"
-              className="filter__link selected"
-              data-cy="FilterLinkAll"
-            >
-              All
-            </a>
-
-            <a
-              href="#/active"
-              className="filter__link"
-              data-cy="FilterLinkActive"
-            >
-              Active
-            </a>
-
-            <a
-              href="#/completed"
-              className="filter__link"
-              data-cy="FilterLinkCompleted"
-            >
-              Completed
-            </a>
-          </nav>
-
-          {/* this button should be disabled if there are no completed todos */}
-          <button
-            type="button"
-            className="todoapp__clear-completed"
-            data-cy="ClearCompletedButton"
-          >
-            Clear completed
-          </button>
-        </footer>
+        <Header />
+        {!isLoading && (
+          <>
+            <section className="todoapp__main" data-cy="TodoList">
+              {filteredTodos.map(todo => (
+                <TodoItem todo={todo} key={todo.id} />
+              ))}
+              {tempTodo && <TodoItem todo={tempTodo} key={tempTodo.id} />}
+            </section>
+            {todos.length > 0 && <Footer />}
+          </>
+        )}
       </div>
+      <ErrNotification />
     </div>
   );
 };
diff --git a/src/UserWarning.tsx b/src/UserWarning.tsx
new file mode 100644
index 000000000..fa25838e6
--- /dev/null
+++ b/src/UserWarning.tsx
@@ -0,0 +1,15 @@
+import React from 'react';
+
+export const UserWarning: React.FC = () => (
+  <section className="section">
+    <p className="box is-size-3">
+      Please get your <b> userId </b>{' '}
+      <a href="https://mate-academy.github.io/react_student-registration">
+        here
+      </a>{' '}
+      and save it in the app <pre>const USER_ID = ...</pre>
+      All requests to the API must be sent with this
+      <b> userId.</b>
+    </p>
+  </section>
+);
diff --git a/src/api/todos.ts b/src/api/todos.ts
new file mode 100644
index 000000000..2cb0bf6fd
--- /dev/null
+++ b/src/api/todos.ts
@@ -0,0 +1,22 @@
+import { Todo } from '../types/Todo';
+import { client } from '../utils/fetchClient';
+
+// Your userId is 1414
+// Please use it for all your requests to the Students API. For example:
+// https://mate.academy/students-api/todos?userId=1414
+
+export const getTodos = (userid: number) => {
+  return client.get<Todo[]>(`/todos?userId=${userid}`);
+};
+
+export function deleteTodo(todoId: number) {
+  return client.delete(`/todos/${todoId}`);
+}
+
+export function createTodo({ title, userId, completed }: Omit<Todo, 'id'>) {
+  return client.post<Todo>('/todos', { title, userId, completed });
+}
+
+export function updateTodo({ id, title, completed, userId }: Todo) {
+  return client.patch<Todo>(`/todos/${id}`, { title, completed, userId });
+}
diff --git a/src/components/ErrNotification.tsx b/src/components/ErrNotification.tsx
new file mode 100644
index 000000000..afa9402a4
--- /dev/null
+++ b/src/components/ErrNotification.tsx
@@ -0,0 +1,26 @@
+import classNames from 'classnames';
+import { useTodoContext } from './TodoContext';
+
+type Props = {};
+
+export const ErrNotification: React.FC<Props> = () => {
+  const { error, setError } = useTodoContext();
+
+  return (
+    <div
+      data-cy="ErrorNotification"
+      className={classNames(
+        'notification is-danger is-light has-text-weight-normal',
+        { hidden: !error },
+      )}
+    >
+      <button
+        data-cy="HideErrorButton"
+        type="button"
+        className="delete"
+        onClick={() => setError('')}
+      />
+      <div>{error}</div>
+    </div>
+  );
+};
diff --git a/src/components/Footer.tsx b/src/components/Footer.tsx
new file mode 100644
index 000000000..a133923e1
--- /dev/null
+++ b/src/components/Footer.tsx
@@ -0,0 +1,83 @@
+import classNames from 'classnames';
+import { Filter } from '../types/Filter';
+import { useTodoContext } from './TodoContext';
+import { deleteTodo } from '../api/todos';
+import { focusInput } from '../utils/services';
+import { Todo } from '../types/Todo';
+
+type Props = {};
+
+export const Footer: React.FC<Props> = () => {
+  const {
+    todos,
+    setTodos,
+    showError,
+    setActiveTodoId,
+    inputRef,
+    filter,
+    setFilter,
+  } = useTodoContext();
+
+  const hasCompleted = todos.some(todo => todo.completed);
+
+  const handleFilterChange = (newFilter: Filter) => {
+    setFilter(newFilter);
+  };
+
+  const handleClearCompleted = async () => {
+    const completedTodoIds = todos
+      .filter(todo => todo.completed)
+      .map(todo => todo.id);
+
+    Promise.allSettled(
+      completedTodoIds.map(async todoId => {
+        try {
+          await deleteTodo(todoId);
+
+          setTodos((currentTodos: Todo[]) =>
+            currentTodos.filter(todo => todo.id !== todoId),
+          );
+        } catch {
+          showError('Unable to delete a todo');
+        } finally {
+          setActiveTodoId(null);
+          focusInput(inputRef);
+        }
+      }),
+    );
+  };
+
+  return (
+    <footer className="todoapp__footer" data-cy="Footer">
+      <span className="todo-count" data-cy="TodosCounter">
+        {todos.filter(todo => !todo.completed).length} items left
+      </span>
+
+      <nav className="filter" data-cy="Filter">
+        {Object.values(Filter).map(filterValue => (
+          <a
+            key={filterValue}
+            href={`#/${filterValue}`}
+            className={classNames('filter__link', {
+              selected: filter === filterValue,
+            })}
+            data-cy={`FilterLink${filterValue.charAt(0).toUpperCase() + filterValue.slice(1)}`}
+            onClick={() => handleFilterChange(filterValue)}
+          >
+            {filterValue.charAt(0).toUpperCase() + filterValue.slice(1)}
+          </a>
+        ))}
+      </nav>
+
+      <button
+        type="button"
+        className="todoapp__clear-completed"
+        data-cy="ClearCompletedButton"
+        disabled={!hasCompleted}
+        onClick={handleClearCompleted}
+      >
+        Clear completed
+      </button>
+    </footer>
+  );
+};
diff --git a/src/components/Header.tsx b/src/components/Header.tsx
new file mode 100644
index 000000000..cf9dcfb1d
--- /dev/null
+++ b/src/components/Header.tsx
@@ -0,0 +1,152 @@
+import classNames from 'classnames';
+import { useTodoContext } from './TodoContext';
+import { createTodo, updateTodo } from '../api/todos';
+import { Todo } from '../types/Todo';
+import { focusInput } from '../utils/services';
+import { USER_ID } from '../utils/constants';
+
+type Props = {};
+
+export const Header: React.FC<Props> = () => {
+  const {
+    todoTitle,
+    setTodoTitle,
+    todos,
+    setTodos,
+    showError,
+    setActiveTodoList,
+    setError,
+    inputRef,
+    isSubmitting,
+    setIsSubmitting,
+    setActiveTodoId,
+    setTempTodo,
+  } = useTodoContext();
+
+  const isAllCompleted =
+    todos.length > 0 && todos.every(todo => todo.completed);
+
+  const handleToggleAll = async () => {
+    let toggledList = todos.filter(todo => !todo.completed);
+
+    if (isAllCompleted) {
+      toggledList = [...todos];
+    }
+
+    const shouldCompleteAll = !isAllCompleted;
+    const activeTodoIds = toggledList.map(todo => todo.id);
+
+    setActiveTodoList(activeTodoIds);
+
+    await Promise.allSettled(
+      toggledList.map(async todo => {
+        const updatedTodo = {
+          ...todo,
+          completed: shouldCompleteAll,
+        };
+        const { id, title, completed, userId } = updatedTodo;
+
+        try {
+          const updated = await updateTodo({ id, title, completed, userId });
+
+          setTodos(currentTodos =>
+            currentTodos.map(t => (t.id === updated.id ? updated : t)),
+          );
+        } catch {
+          showError(`Unable to update todo with ID ${todo.id}`);
+        }
+      }),
+    );
+
+    setActiveTodoList([]);
+  };
+
+  const resetForm = () => {
+    setTodoTitle('');
+    setTempTodo(null);
+    setError('');
+  };
+
+  const handleSubmit = async (event: React.FormEvent) => {
+    event.preventDefault();
+    const trimmedTitle = todoTitle.trim();
+
+    setError('');
+    setTodoTitle(trimmedTitle);
+
+    if (!trimmedTitle) {
+      showError('Title should not be empty');
+      focusInput(inputRef);
+
+      return;
+    }
+
+    const newTempTodo: Todo = {
+      id: 0,
+      title: trimmedTitle,
+      userId: USER_ID,
+      completed: false,
+    };
+
+    setTempTodo(newTempTodo);
+    setIsSubmitting(true);
+    setActiveTodoId(newTempTodo.id);
+
+    try {
+      const newTodo = await createTodo({
+        title: trimmedTitle,
+        userId: USER_ID,
+        completed: false,
+      });
+
+      setTodos(prevTodos => [...prevTodos, newTodo]);
+      resetForm();
+    } catch (err) {
+      showError('Unable to add a todo');
+      throw err;
+    } finally {
+      setIsSubmitting(false);
+      setTempTodo(null);
+      setActiveTodoId(null);
+      focusInput(inputRef);
+    }
+  };
+
+  const handleTitleChange = (event: React.ChangeEvent<HTMLInputElement>) => {
+    setTodoTitle(event.target.value);
+    setError('');
+  };
+
+  return (
+    <header className="todoapp__header">
+      {todos.length > 0 && (
+        <button
+          type="button"
+          onClick={handleToggleAll}
+          data-cy="ToggleAllButton"
+          className={classNames('todoapp__toggle-all', {
+            active: isAllCompleted,
+          })}
+        />
+      )}
+
+      <form
+        action="api/todos"
+        method="POST"
+        onSubmit={handleSubmit}
+        onReset={resetForm}
+      >
+        <input
+          data-cy="NewTodoField"
+          type="text"
+          className="todoapp__new-todo"
+          placeholder="What needs to be done?"
+          value={todoTitle}
+          onChange={handleTitleChange}
+          ref={inputRef}
+          disabled={isSubmitting}
+        />
+      </form>
+    </header>
+  );
+};
diff --git a/src/components/TodoContext.tsx b/src/components/TodoContext.tsx
new file mode 100644
index 000000000..5c06946e3
--- /dev/null
+++ b/src/components/TodoContext.tsx
@@ -0,0 +1,90 @@
+import React, { useContext, useMemo, useRef, useState } from 'react';
+import { Todo } from '../types/Todo';
+import { Filter } from '../types/Filter';
+
+type TodoContextType = {
+  todos: Todo[];
+  setTodos: React.Dispatch<React.SetStateAction<Todo[]>>;
+  isLoading: boolean;
+  setIsLoading: (state: boolean) => void;
+  error: string;
+  setError: (err: string) => void;
+  showError: (message: string) => void;
+  activeTodoId: number | null;
+  setActiveTodoId: (todoId: number | null) => void;
+  inputRef: React.RefObject<HTMLInputElement>;
+  activeTodoList: number[];
+  setActiveTodoList: (activeTodoIds: number[]) => void;
+  tempTodo: Todo | null;
+  setTempTodo: (todo: Todo | null) => void;
+  isSubmitting: boolean;
+  setIsSubmitting: (issubmiting: boolean) => void;
+  todoTitle: string;
+  setTodoTitle: (newtitle: string) => void;
+  filter: Filter;
+  setFilter: (filter: Filter) => void;
+};
+
+export const TodoContext = React.createContext<TodoContextType | undefined>(
+  undefined,
+);
+
+type Props = {
+  children: React.ReactNode;
+};
+
+export const TodoProvider: React.FC<Props> = ({ children }) => {
+  const [todos, setTodos] = useState<Todo[]>([]);
+  const [isLoading, setIsLoading] = useState(false);
+  const [error, setError] = useState('');
+  const [todoTitle, setTodoTitle] = useState('');
+  const [filter, setFilter] = useState<Filter>(Filter.All);
+  const [activeTodoId, setActiveTodoId] = useState<number | null>(null);
+  const [isSubmitting, setIsSubmitting] = useState(false);
+  const [tempTodo, setTempTodo] = useState<Todo | null>(null);
+  const inputRef = useRef<HTMLInputElement>(null);
+  const [activeTodoList, setActiveTodoList] = useState<number[]>([]);
+
+  const showError = (message: string) => {
+    setError(message);
+    setTimeout(() => setError(''), 3000);
+  };
+
+  const value = useMemo(
+    () => ({
+      todos,
+      setTodos,
+      isLoading,
+      setIsLoading,
+      error,
+      setError,
+      todoTitle,
+      setTodoTitle,
+      activeTodoId,
+      setActiveTodoId,
+      isSubmitting,
+      setIsSubmitting,
+      tempTodo,
+      setTempTodo,
+      inputRef,
+      activeTodoList,
+      setActiveTodoList,
+      showError,
+      filter,
+      setFilter,
+    }),
+    [todos, todoTitle, filter, activeTodoId, activeTodoList, error],
+  );
+
+  return <TodoContext.Provider value={value}>{children}</TodoContext.Provider>;
+};
+
+export const useTodoContext = () => {
+  const context = useContext(TodoContext);
+
+  if (!context) {
+    throw new Error('useTodoContext must be used within a TodoProvider');
+  }
+
+  return context;
+};
diff --git a/src/components/TodoItem.tsx b/src/components/TodoItem.tsx
new file mode 100644
index 000000000..dd22a7a99
--- /dev/null
+++ b/src/components/TodoItem.tsx
@@ -0,0 +1,207 @@
+/* eslint-disable jsx-a11y/label-has-associated-control */
+import classNames from 'classnames';
+import { Todo } from '../types/Todo';
+import { useEffect, useState } from 'react';
+import { focusInput } from '../utils/services';
+import { deleteTodo, updateTodo } from '../api/todos';
+import { USER_ID } from '../utils/constants';
+import { useTodoContext } from './TodoContext';
+
+type Props = {
+  todo: Todo;
+};
+
+export const TodoItem: React.FC<Props> = ({ todo }) => {
+  const {
+    inputRef,
+    setActiveTodoId,
+    setTodos,
+    showError,
+    activeTodoId,
+    activeTodoList,
+    setError,
+  } = useTodoContext();
+
+  const { id, completed, title } = todo;
+  const [isEditing, setIsEditing] = useState(false);
+  const [newTitle, setNewTitle] = useState(todo.title);
+
+  useEffect(() => {
+    focusInput(inputRef);
+  }, [isEditing, inputRef]);
+
+  const handleEdit = () => {
+    setIsEditing(true);
+  };
+
+  const handleChange = (event: React.ChangeEvent<HTMLInputElement>) => {
+    setNewTitle(event.target.value);
+  };
+
+  const handleUpdateTodo = async (todoItem: Todo, newTodoTitle: string) => {
+    setActiveTodoId(todoItem.id);
+
+    try {
+      const updatedTodo = await updateTodo({
+        id: todoItem.id,
+        title: newTodoTitle,
+        completed: todoItem.completed,
+        userId: USER_ID,
+      });
+
+      setTodos(prevTodos =>
+        prevTodos.map(tItem =>
+          tItem.id === updatedTodo.id ? updatedTodo : tItem,
+        ),
+      );
+    } catch (err) {
+      showError('Unable to update a todo');
+      throw err;
+    } finally {
+      setActiveTodoId(null);
+    }
+  };
+
+  const handleDeleteTodo = async (todoId: number) => {
+    setActiveTodoId(todoId);
+    try {
+      await deleteTodo(todoId);
+      setTodos(currentTodos => currentTodos.filter(t => t.id !== todoId));
+    } catch (err) {
+      showError('Unable to delete a todo');
+      throw err;
+    } finally {
+      setActiveTodoId(null);
+      focusInput(inputRef);
+    }
+  };
+
+  const handleRenameSubmit = async () => {
+    let errorMsg = false;
+
+    if (newTitle.trim() === '') {
+      try {
+        await handleDeleteTodo(todo.id);
+      } catch (err) {
+        if (err) {
+          errorMsg = true;
+        }
+
+        focusInput(inputRef);
+      }
+    } else if (newTitle.trim() !== todo.title) {
+      try {
+        await handleUpdateTodo(todo, newTitle.trim());
+      } catch (err) {
+        if (err) {
+          errorMsg = true;
+        }
+
+        focusInput(inputRef);
+      }
+    }
+
+    if (errorMsg) {
+      focusInput(inputRef);
+
+      return;
+    }
+
+    setIsEditing(false);
+  };
+
+  const handleKeyUp = (e: React.KeyboardEvent<HTMLInputElement>) => {
+    if (e.key === 'Enter') {
+      handleRenameSubmit();
+    } else if (e.key === 'Escape') {
+      setIsEditing(false);
+      setNewTitle(todo.title);
+    }
+  };
+
+  const handleBlur = () => {
+    handleRenameSubmit();
+  };
+
+  const handleToggle = async (todoItem: Todo) => {
+    setError('');
+    setActiveTodoId(todoItem.id);
+    const updatedtodo = { ...todoItem, completed: !todoItem.completed };
+
+    try {
+      const updated = await updateTodo(updatedtodo);
+
+      setTodos(currentTodos =>
+        currentTodos.map(t => (t.id === updated.id ? updated : t)),
+      );
+    } catch {
+      showError('Unable to update a todo');
+    } finally {
+      setActiveTodoId(null);
+    }
+  };
+
+  return (
+    <div
+      data-cy="Todo"
+      key={id}
+      className={classNames('todo', { completed: completed })}
+    >
+      <label className="todo__status-label" htmlFor={`todo-checkbox-${id}`}>
+        <input
+          id={`todo-checkbox-${id}`}
+          data-cy="TodoStatus"
+          type="checkbox"
+          className="todo__status"
+          checked={completed}
+          onChange={() => handleToggle(todo)}
+        />
+      </label>
+      {isEditing ? (
+        <form onSubmit={e => e.preventDefault()}>
+          <input
+            data-cy="TodoTitleField"
+            type="text"
+            className="todo__title-field"
+            placeholder="Empty todo will be deleted"
+            value={newTitle}
+            onChange={handleChange}
+            onBlur={handleBlur}
+            onKeyUp={handleKeyUp}
+            ref={inputRef}
+          />
+        </form>
+      ) : (
+        <>
+          <span
+            data-cy="TodoTitle"
+            className="todo__title"
+            onDoubleClick={handleEdit}
+          >
+            {title}
+          </span>
+          <button
+            type="button"
+            className="todo__remove"
+            data-cy="TodoDelete"
+            onClick={() => handleDeleteTodo(todo.id)}
+          >
+            ×
+          </button>
+        </>
+      )}
+
+      <div
+        data-cy="TodoLoader"
+        className={classNames('modal overlay', {
+          'is-active':
+            todo.id === activeTodoId ||
+            (activeTodoList && activeTodoList.includes(todo.id)),
+        })}
+      >
+        <div className="modal-background has-background-white-ter" />
+        <div className="loader" />
+      </div>
+    </div>
+  );
+};
diff --git a/src/index.tsx b/src/index.tsx
index a9689cb38..8caeb506f 100644
--- a/src/index.tsx
+++ b/src/index.tsx
@@ -1,11 +1,16 @@
 import { createRoot } from 'react-dom/client';
 
-import './styles/index.css';
-import './styles/todo-list.css';
-import './styles/filters.css';
+import 'bulma/css/bulma.css';
+import '@fortawesome/fontawesome-free/css/all.css';
+import './styles/index.scss';
 
 import { App } from './App';
+import { TodoProvider } from './components/TodoContext';
 
 const container = document.getElementById('root') as HTMLDivElement;
 
-createRoot(container).render(<App />);
+createRoot(container).render(
+  <TodoProvider>
+    <App />
+  </TodoProvider>,
+);
diff --git a/src/types/Filter.ts b/src/types/Filter.ts
new file mode 100644
index 000000000..174408fd6
--- /dev/null
+++ b/src/types/Filter.ts
@@ -0,0 +1,5 @@
+export enum Filter {
+  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/constants.ts b/src/utils/constants.ts
new file mode 100644
index 000000000..f9fb74ede
--- /dev/null
+++ b/src/utils/constants.ts
@@ -0,0 +1 @@
+export const USER_ID = 1414;
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/services.ts b/src/utils/services.ts
new file mode 100644
index 000000000..3d3b84909
--- /dev/null
+++ b/src/utils/services.ts
@@ -0,0 +1,7 @@
+import { RefObject } from 'react';
+
+export const focusInput = (inputRef: RefObject<HTMLInputElement>) => {
+  if (inputRef.current) {
+    inputRef.current.focus();
+  }
+};