diff --git a/README.md b/README.md
index af7dae81f6..dc1212e0b6 100644
--- a/README.md
+++ b/README.md
@@ -41,4 +41,4 @@ 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://OlhaMomot.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 5749bdf784..231bdee538 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -1,24 +1,62 @@
-/* eslint-disable max-len */
-/* eslint-disable jsx-a11y/control-has-associated-label */
-import React from 'react';
-import { UserWarning } from './UserWarning';
-
-const USER_ID = 0;
+import React, {
+  useMemo,
+  useState,
+} from 'react';
+import { TodoList } from './components/TodoList';
+import { Header } from './components/Header';
+import { Todo } from './types/Todo';
+import { Footer } from './components/Footer';
+import { ErrorNotification } from './components/ErrorNotification';
+import { FilterOption } from './types/FilterOptions';
+import { useTodo } from './hooks/useTodo';
+import { getFilteredTodos } from './helpers/getFilteredTodos';
 
 export const App: React.FC = () => {
-  if (!USER_ID) {
-    return <UserWarning />;
-  }
+  const [filter, setFilter] = useState<string>(FilterOption.All);
+  const [tempTodo, setTempTodo] = useState<Todo | null>(null);
+
+  const {
+    todos,
+    setErrorMessage,
+    errorMessage,
+  } = useTodo();
+
+  const filteredTodos = useMemo(
+    () => getFilteredTodos(todos, filter), [filter, todos],
+  );
+
+  const activeTodos = useMemo(() => {
+    return todos.filter(({ completed }) => !completed);
+  }, [todos]);
 
   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
+          activeTodos={activeTodos}
+          setTempTodo={setTempTodo}
+        />
+
+        {!!filteredTodos.length && (
+          <TodoList todos={filteredTodos} tempTodo={tempTodo} />
+        )}
+
+        {!!todos.length && (
+          <Footer
+            activeTodos={activeTodos}
+            filter={filter}
+            setFilter={setFilter}
+          />
+        )}
+      </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..b0a0712cd2
--- /dev/null
+++ b/src/api/todos.ts
@@ -0,0 +1,18 @@
+import { Todo } from '../types/Todo';
+import { client } from '../utils/fetchClient';
+
+export const getTodos = (userId: number) => {
+  return client.get<Todo[]>(`/todos?userId=${userId}`);
+};
+
+export const addTodo = (newTodo: Omit<Todo, 'id'>) => {
+  return client.post<Todo>('/todos', newTodo);
+};
+
+export const deleteTodo = (todoId: number) => {
+  return client.delete(`/todos/${todoId}`);
+};
+
+export const updateTodo = (todoId: number, newTodo: Omit<Todo, 'id'>) => {
+  return client.patch<Todo>(`/todos/${todoId}`, newTodo);
+};
diff --git a/src/components/ErrorNotification.tsx b/src/components/ErrorNotification.tsx
new file mode 100644
index 0000000000..02117d95c6
--- /dev/null
+++ b/src/components/ErrorNotification.tsx
@@ -0,0 +1,49 @@
+/* eslint-disable jsx-a11y/control-has-associated-label */
+import classNames from 'classnames';
+import { useEffect } from 'react';
+
+type Props = {
+  errorMessage: string;
+  setErrorMessage: (message: string) => void;
+};
+
+export const ErrorNotification: React.FC<Props> = ({
+  errorMessage,
+  setErrorMessage,
+}) => {
+  useEffect(() => {
+    let timer: NodeJS.Timeout | undefined;
+
+    if (errorMessage) {
+      timer = setTimeout(() => {
+        setErrorMessage('');
+      }, 3000);
+    }
+
+    return () => {
+      if (timer) {
+        clearTimeout(timer);
+      }
+    };
+  }, [errorMessage]);
+
+  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/Footer.tsx b/src/components/Footer.tsx
new file mode 100644
index 0000000000..3ce738f84e
--- /dev/null
+++ b/src/components/Footer.tsx
@@ -0,0 +1,66 @@
+import classNames from 'classnames';
+import React from 'react';
+
+import { Todo } from '../types/Todo';
+import { FilterOption } from '../types/FilterOptions';
+import { useTodo } from '../hooks/useTodo';
+
+type Props = {
+  activeTodos: Todo[],
+  filter: string,
+  setFilter: (filter: string) => void,
+};
+
+export const Footer: React.FC<Props> = ({
+  activeTodos,
+  filter,
+  setFilter,
+}) => {
+  const { todos, handleDeleteTodo } = useTodo();
+
+  const completedTodos = todos.filter(({ completed }) => completed);
+
+  const onDeleteCompletedTodos = async () => {
+    await Promise.all(completedTodos
+      .map(({ id }) => handleDeleteTodo(id)));
+  };
+
+  return (
+    <footer className="todoapp__footer" data-cy="Footer">
+      <span className="todo-count" data-cy="TodosCounter">
+        {activeTodos.length === 1
+          ? '1 item left'
+          : `${activeTodos.length} items left`}
+      </span>
+
+      <nav className="filter" data-cy="Filter">
+        {Object.values(FilterOption).map((option) => (
+          <a
+            key={option}
+            data-cy={`FilterLink${option}`}
+            href={`#/${option.toLowerCase()}`}
+            className={classNames(
+              'filter__link',
+              { selected: option === filter },
+            )}
+            onClick={() => setFilter(option)}
+          >
+            {option}
+          </a>
+        ))}
+      </nav>
+
+      <button
+        type="button"
+        className={classNames('todoapp__clear-completed', {
+          'is-invisible': !completedTodos.length,
+        })}
+        data-cy="ClearCompletedButton"
+        onClick={onDeleteCompletedTodos}
+        disabled={!completedTodos.length}
+      >
+        Clear completed
+      </button>
+    </footer>
+  );
+};
diff --git a/src/components/Header.tsx b/src/components/Header.tsx
new file mode 100644
index 0000000000..8da04b47b4
--- /dev/null
+++ b/src/components/Header.tsx
@@ -0,0 +1,123 @@
+import React, {
+  useEffect, useRef, useState,
+} from 'react';
+import classNames from 'classnames';
+
+import { Todo } from '../types/Todo';
+import { USER_ID } from '../utils/constants';
+import { useTodo } from '../hooks/useTodo';
+
+type Props = {
+  activeTodos: Todo[];
+  setTempTodo: (todo: Todo | null) => void;
+};
+
+export const Header: React.FC<Props> = ({ activeTodos, setTempTodo }) => {
+  const [title, setTitle] = useState('');
+  const [titleError, setTitleError] = useState(false);
+  const [isSubmiting, setIsSubmiting] = useState(false);
+  const todoTitleField = useRef<HTMLInputElement>(null);
+  const {
+    todos,
+    setErrorMessage,
+    handleAddTodo,
+    handleUpdateTodo,
+  } = useTodo();
+
+  useEffect(() => {
+    if (todoTitleField.current) {
+      todoTitleField.current.focus();
+    }
+  }, [todos.length]);
+
+  const onTitleChange = (event: React.ChangeEvent<HTMLInputElement>) => {
+    setTitle(event?.target.value);
+
+    if (titleError) {
+      setTitleError(false);
+    }
+  };
+
+  const onSubmit = async (event: React.FormEvent<HTMLFormElement>) => {
+    event.preventDefault();
+
+    setIsSubmiting(true);
+    const newTitle = title.trim();
+
+    if (!newTitle) {
+      setErrorMessage('Title should not be empty');
+      setIsSubmiting(false);
+
+      return;
+    }
+
+    const newTodo = {
+      title: newTitle,
+      userId: USER_ID,
+      completed: false,
+    };
+
+    setTempTodo({ id: 0, ...newTodo });
+
+    try {
+      await handleAddTodo(newTodo);
+
+      setIsSubmiting(false);
+
+      setTitle('');
+      setTempTodo(null);
+    } catch (error) {
+      setIsSubmiting(false);
+      setTempTodo(null);
+    }
+  };
+
+  const onToggleAll = async () => {
+    if (activeTodos.length) {
+      const updatePromises = activeTodos.map(currentTodo => handleUpdateTodo(
+        currentTodo,
+        { completed: true },
+      ));
+
+      await Promise.all(updatePromises);
+    } else {
+      const updatePromises = todos.map(currentTodo => handleUpdateTodo(
+        currentTodo,
+        { completed: false },
+      ));
+
+      await Promise.all(updatePromises);
+    }
+  };
+
+  return (
+    <header className="todoapp__header">
+      {!!todos.length
+        && (
+          <button
+            type="button"
+            className={classNames(
+              'todoapp__toggle-all',
+              { active: !activeTodos.length },
+            )}
+            data-cy="ToggleAllButton"
+            onClick={onToggleAll}
+          >
+            {' '}
+          </button>
+        )}
+      <form onSubmit={onSubmit}>
+        <input
+          ref={todoTitleField}
+          data-cy="NewTodoField"
+          type="text"
+          className="todoapp__new-todo"
+          placeholder="What needs to be done?"
+          value={title}
+          onChange={onTitleChange}
+          disabled={isSubmiting}
+        />
+      </form>
+    </header>
+  );
+};
diff --git a/src/components/TodoItem.tsx b/src/components/TodoItem.tsx
new file mode 100644
index 0000000000..a10e69d18c
--- /dev/null
+++ b/src/components/TodoItem.tsx
@@ -0,0 +1,153 @@
+import classNames from 'classnames';
+import React, {
+  useEffect,
+  useRef,
+  useState,
+} from 'react';
+import { Todo } from '../types/Todo';
+import { useTodo } from '../hooks/useTodo';
+
+type Props = {
+  todo: Todo,
+};
+
+export const TodoItem: React.FC<Props> = ({ todo }) => {
+  const [isItemLoading, setIsItemLoading] = useState(todo.id === 0);
+  const [isEditing, setIsEditing] = useState(false);
+  const [todoTitle, setTodoTitle] = useState(todo.title);
+  const todoTitleField = useRef<HTMLInputElement>(null);
+  const {
+    isLoadingTodoIds,
+    handleDeleteTodo,
+    handleUpdateTodo,
+  } = useTodo();
+
+  const onCheckboxChange = async () => {
+    setIsItemLoading(true);
+    await handleUpdateTodo(todo, { completed: !todo.completed });
+    setIsItemLoading(false);
+  };
+
+  const handleTodoTitleChange = (
+    event: React.ChangeEvent<HTMLInputElement>,
+  ) => {
+    setTodoTitle(event.target.value);
+  };
+
+  const handleTodoDoubleClick = () => {
+    setIsEditing(true);
+  };
+
+  const handleTodoSave = async (event: React.ChangeEvent<HTMLFormElement>) => {
+    event.preventDefault();
+
+    setIsItemLoading(true);
+    const title = todoTitle.trim();
+
+    if (title === todo.title) {
+      setIsEditing(false);
+      setIsItemLoading(false);
+
+      return;
+    }
+
+    if (title) {
+      await handleUpdateTodo(todo, { title });
+    } else {
+      await handleDeleteTodo(todo.id);
+    }
+
+    setIsEditing(false);
+    setIsItemLoading(false);
+  };
+
+  const handleTodoDelete = async () => {
+    setIsItemLoading(true);
+    await handleDeleteTodo(todo.id);
+    setIsItemLoading(false);
+  };
+
+  useEffect(() => {
+    if (isEditing && todoTitleField.current) {
+      todoTitleField.current.focus();
+    }
+  }, [isEditing]);
+
+  const handleKeyUp = (e: React.KeyboardEvent) => {
+    if (e.key === 'Escape') {
+      setIsEditing(false);
+      setTodoTitle(todo.title);
+    }
+  };
+
+  const isLoaderActive = (isLoadingTodoIds.includes(todo.id))
+    || isItemLoading;
+
+  return (
+    <div
+      data-cy="Todo"
+      className={classNames('todo', { completed: todo.completed })}
+    >
+      <label className="todo__status-label">
+        <input
+          id={todo.title}
+          data-cy="TodoStatus"
+          type="checkbox"
+          className="todo__status"
+          checked={todo.completed}
+          onChange={onCheckboxChange}
+        />
+      </label>
+
+      {isEditing
+        ? (
+          <form
+            onSubmit={handleTodoSave}
+            onBlur={handleTodoSave}
+          >
+            <input
+              ref={todoTitleField}
+              data-cy="NewTodoField"
+              type="text"
+              className="todo__title-field"
+              placeholder="Empty title will be deleted"
+              value={todoTitle}
+              onChange={handleTodoTitleChange}
+              onKeyUp={handleKeyUp}
+            />
+          </form>
+        ) : (
+          <>
+            <span
+              className="todo__title"
+              data-cy="TodoTitle"
+              onDoubleClick={handleTodoDoubleClick}
+            >
+              {todo.title}
+            </span>
+            <button
+              type="button"
+              className="todo__remove"
+              data-cy="TodoDelete"
+              onClick={handleTodoDelete}
+            >
+              ×
+            </button>
+          </>
+        )}
+
+      <div
+        data-cy="TodoLoader"
+        className={classNames(
+          'modal overlay',
+          {
+            'is-active': isLoaderActive,
+          },
+        )}
+      >
+        <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..98b728ea30
--- /dev/null
+++ b/src/components/TodoList.tsx
@@ -0,0 +1,24 @@
+import { TodoItem } from './TodoItem';
+import { Todo } from '../types/Todo';
+
+type Props = {
+  todos: Todo[];
+  tempTodo: Todo | null;
+};
+
+export const TodoList: React.FC<Props> = ({ todos, tempTodo }) => {
+  return (
+    <section className="todoapp__main" data-cy="TodoList">
+      {todos.map(todo => (
+        <TodoItem
+          todo={todo}
+          key={todo.id}
+        />
+      ))}
+
+      {tempTodo && (
+        <TodoItem todo={tempTodo} />
+      )}
+    </section>
+  );
+};
diff --git a/src/components/TodoProvider.tsx b/src/components/TodoProvider.tsx
new file mode 100644
index 0000000000..94d2afb80e
--- /dev/null
+++ b/src/components/TodoProvider.tsx
@@ -0,0 +1,124 @@
+import React, { createContext, useEffect, useState } from 'react';
+
+import { Todo } from '../types/Todo';
+import {
+  addTodo,
+  deleteTodo,
+  getTodos,
+  updateTodo,
+} from '../api/todos';
+import { USER_ID } from '../utils/constants';
+
+export interface TodoContextProps {
+  todos: Todo[];
+  handleAddTodo: (todo: Omit<Todo, 'id'>) => Promise<void>;
+  handleDeleteTodo: (todoId: number) => Promise<void>;
+  handleUpdateTodo: (todo: Todo, property: Partial<Todo>) => Promise<void>;
+  errorMessage: string;
+  setErrorMessage: (str: string) => void;
+  isLoadingTodoIds: number[];
+}
+
+export const TodoContext = createContext<TodoContextProps>({
+  todos: [],
+  handleAddTodo: async () => { },
+  handleDeleteTodo: async () => { },
+  handleUpdateTodo: async () => { },
+  errorMessage: '',
+  setErrorMessage: () => { },
+  isLoadingTodoIds: [],
+});
+
+type TodoProviderProps = {
+  children: React.ReactNode;
+};
+
+export const TodoProvider: React.FC<TodoProviderProps> = ({ children }) => {
+  const [todos, setTodos] = useState<Todo[]>([]);
+  const [errorMessage, setErrorMessage] = useState('');
+  const [isLoadingTodoIds, setIsLoadingTodoIds] = useState<number[]>([]);
+
+  const handleAddTodo = async (
+    newTodo: Omit<Todo, 'id'>,
+  ) => {
+    try {
+      const createdTodo = await addTodo(newTodo);
+
+      setTodos((currentTodos) => [...currentTodos, createdTodo]);
+    } catch (error) {
+      setErrorMessage('Unable to add a todo');
+      throw new Error();
+    }
+  };
+
+  const handleUpdateTodo = async (
+    todo: Todo,
+    propertiesToUpdate: Partial<Todo>,
+  ) => {
+    setIsLoadingTodoIds(prevLoadingTodoIds => ([
+      ...prevLoadingTodoIds,
+      todo.id,
+    ]));
+
+    try {
+      const updatedTodo = await updateTodo(todo.id, {
+        ...todo,
+        ...propertiesToUpdate,
+      });
+
+      setTodos((currentTodos: Todo[]) => {
+        return currentTodos.map((currentTodo) => {
+          return currentTodo.id === updatedTodo.id
+            ? updatedTodo
+            : currentTodo;
+        }) as Todo[];
+      });
+    } catch (error) {
+      setErrorMessage('Unable to update todo');
+    }
+
+    setIsLoadingTodoIds(prevLoadingTodos => prevLoadingTodos.filter(
+      id => todo.id !== id,
+    ));
+  };
+
+  const handleDeleteTodo = async (todoId: number) => {
+    setIsLoadingTodoIds(prevLoadingTodoIds => ([
+      ...prevLoadingTodoIds,
+      todoId,
+    ]));
+
+    try {
+      await deleteTodo(todoId);
+      setTodos(currentTodos => currentTodos.filter(({ id }) => id !== todoId));
+    } catch {
+      setErrorMessage('Unable to delete a todo');
+    }
+
+    setIsLoadingTodoIds(prevLoadingTodos => prevLoadingTodos.filter(
+      id => todoId !== id,
+    ));
+  };
+
+  useEffect(() => {
+    getTodos(USER_ID)
+      .then(setTodos)
+      .catch(() => setErrorMessage('Unable to load todos'));
+  }, []);
+
+  return (
+    <TodoContext.Provider
+      value={{
+        todos,
+        handleAddTodo,
+        handleDeleteTodo,
+        handleUpdateTodo,
+        setErrorMessage,
+        errorMessage,
+        isLoadingTodoIds,
+      }}
+    >
+      {children}
+    </TodoContext.Provider>
+  );
+};
diff --git a/src/helpers/getFilteredTodos.tsx b/src/helpers/getFilteredTodos.tsx
new file mode 100644
index 0000000000..90a0fc6080
--- /dev/null
+++ b/src/helpers/getFilteredTodos.tsx
@@ -0,0 +1,16 @@
+import { FilterOption } from '../types/FilterOptions';
+import { Todo } from '../types/Todo';
+
+export const getFilteredTodos = (todos: Todo[], filter: string) => {
+  return todos.filter(({ completed }) => {
+    switch (filter) {
+      case FilterOption.Active:
+        return !completed;
+      case FilterOption.Completed:
+        return completed;
+      case FilterOption.All:
+      default:
+        return true;
+    }
+  });
+};
diff --git a/src/hooks/useTodo.tsx b/src/hooks/useTodo.tsx
new file mode 100644
index 0000000000..6b64fb8a35
--- /dev/null
+++ b/src/hooks/useTodo.tsx
@@ -0,0 +1,8 @@
+import { useContext } from 'react';
+import { TodoContext } from '../components/TodoProvider';
+
+export const useTodo = () => {
+  const todoContextValues = useContext(TodoContext);
+
+  return todoContextValues;
+};
diff --git a/src/index.tsx b/src/index.tsx
index 7de19e0c70..7e81c03da4 100644
--- a/src/index.tsx
+++ b/src/index.tsx
@@ -5,6 +5,11 @@ import '@fortawesome/fontawesome-free/css/all.css';
 import './styles/index.scss';
 
 import { App } from './App';
+import { TodoProvider } from './components/TodoProvider';
 
 createRoot(document.getElementById('root') as HTMLDivElement)
-  .render(<App />);
+  .render(
+    <TodoProvider>
+      <App />
+    </TodoProvider>,
+  );
diff --git a/src/styles/todo.scss b/src/styles/todo.scss
index c7f93ff6b9..fc99714ef2 100644
--- a/src/styles/todo.scss
+++ b/src/styles/todo.scss
@@ -8,7 +8,7 @@
   font-size: 24px;
   line-height: 1.4em;
   border-bottom: 1px solid #ededed;
-
+  
   &:last-child {
     border-bottom: 0;
   }
@@ -30,7 +30,7 @@
 
   &__title {
     padding: 12px 15px;
-
+  
     word-break: break-all;
     transition: color 0.4s;
   }
@@ -56,7 +56,7 @@
     border: 0;
     background: none;
     cursor: pointer;
-
+  
     transform: translateY(-2px);
     opacity: 0;
     transition: color 0.2s ease-out;
@@ -65,7 +65,7 @@
       color: #af5b5e;
     }
   }
-
+  
   &:hover &__remove {
     opacity: 1;
   }
@@ -73,13 +73,13 @@
   &__title-field {
     width: 100%;
     padding: 11px 14px;
-
+  
     font-size: inherit;
     line-height: inherit;
     font-family: inherit;
     font-weight: inherit;
     color: inherit;
-
+  
     border: 1px solid #999;
     box-shadow: inset 0 -1px 5px 0 rgba(0, 0, 0, 0.2);
 
@@ -92,58 +92,11 @@
 
   .overlay {
     position: absolute;
-    top: 0;
     left: 0;
     right: 0;
-    height: 58px;
+    bottom: 0;
+    top: 0;
 
     opacity: 0.5;
   }
 }
-
-.item-enter {
-  max-height: 0;
-}
-
-.item-enter-active {
-  overflow: hidden;
-  max-height: 58px;
-  transition: max-height 0.3s ease-in-out;
-}
-
-.item-exit {
-  max-height: 58px;
-}
-
-.item-exit-active {
-  overflow: hidden;
-  max-height: 0;
-  transition: max-height 0.3s ease-in-out;
-}
-
-.temp-item-enter {
-  max-height: 0;
-}
-
-.temp-item-enter-active {
-  overflow: hidden;
-  max-height: 58px;
-  transition: max-height 0.3s ease-in-out;
-}
-
-.temp-item-exit {
-  max-height: 58px;
-}
-
-.temp-item-exit-active {
-  transform: translateY(-58px);
-  max-height: 0;
-  opacity: 0;
-  transition: 0.3s ease-in-out;
-  transition-property: opacity, max-height, transform;
-}
-
-.has-error .temp-item-exit-active {
-  transform: translateY(0);
-  overflow: hidden;
-}
diff --git a/src/styles/todoapp.scss b/src/styles/todoapp.scss
index 9095f1847f..836166156b 100644
--- a/src/styles/todoapp.scss
+++ b/src/styles/todoapp.scss
@@ -121,7 +121,6 @@
     appearance: none;
     -webkit-font-smoothing: antialiased;
     -moz-osx-font-smoothing: grayscale;
-    transition: opacity 0.3s;
 
     &:hover {
       text-decoration: underline;
@@ -130,9 +129,5 @@
     &:active {
       text-decoration: none;
     }
-
-    &:disabled {
-      visibility: hidden;
-    }
   }
 }
diff --git a/src/types/FilterOptions.tsx b/src/types/FilterOptions.tsx
new file mode 100644
index 0000000000..3d3ecd02f0
--- /dev/null
+++ b/src/types/FilterOptions.tsx
@@ -0,0 +1,5 @@
+export enum FilterOption {
+  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/constants.tsx b/src/utils/constants.tsx
new file mode 100644
index 0000000000..1aa2c9b5c0
--- /dev/null
+++ b/src/utils/constants.tsx
@@ -0,0 +1 @@
+export const USER_ID = 11503;
diff --git a/src/utils/fetchClient.ts b/src/utils/fetchClient.ts
new file mode 100644
index 0000000000..ca588ab63a
--- /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',
+    };
+  }
+
+  // we wait for testing purpose to see loaders
+  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'),
+};