diff --git a/README.md b/README.md
index 47a1add059..1eac7f7ad9 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://naviailpach.github.io/react_todo-app-with-api/) and add it to the PR description.
diff --git a/package-lock.json b/package-lock.json
index 19701e8788..0dbc74a8e1 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -19,7 +19,7 @@
       },
       "devDependencies": {
         "@cypress/react18": "^2.0.1",
-        "@mate-academy/scripts": "^1.8.5",
+        "@mate-academy/scripts": "^2.1.3",
         "@mate-academy/students-ts-config": "*",
         "@mate-academy/stylelint-config": "*",
         "@types/node": "^20.14.10",
@@ -1183,10 +1183,11 @@
       }
     },
     "node_modules/@mate-academy/scripts": {
-      "version": "1.8.5",
-      "resolved": "https://registry.npmjs.org/@mate-academy/scripts/-/scripts-1.8.5.tgz",
-      "integrity": "sha512-mHRY2FkuoYCf5U0ahIukkaRo5LSZsxrTSgMJheFoyf3VXsTvfM9OfWcZIDIDB521kdPrScHHnRp+JRNjCfUO5A==",
+      "version": "2.1.3",
+      "resolved": "https://registry.npmjs.org/@mate-academy/scripts/-/scripts-2.1.3.tgz",
+      "integrity": "sha512-a07wHTj/1QUK2Aac5zHad+sGw4rIvcNl5lJmJpAD7OxeSbnCdyI6RXUHwXhjF5MaVo9YHrJ0xVahyERS2IIyBQ==",
       "dev": true,
+      "license": "MIT",
       "dependencies": {
         "@octokit/rest": "^17.11.2",
         "@types/get-port": "^4.2.0",
diff --git a/package.json b/package.json
index b6062525ab..6d0f20adcc 100644
--- a/package.json
+++ b/package.json
@@ -15,7 +15,7 @@
   },
   "devDependencies": {
     "@cypress/react18": "^2.0.1",
-    "@mate-academy/scripts": "^1.8.5",
+    "@mate-academy/scripts": "^2.1.3",
     "@mate-academy/students-ts-config": "*",
     "@mate-academy/stylelint-config": "*",
     "@types/node": "^20.14.10",
diff --git a/src/App.tsx b/src/App.tsx
index 81e011f432..34b851d3cd 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -1,26 +1,240 @@
-/* eslint-disable max-len */
-/* eslint-disable jsx-a11y/control-has-associated-label */
-import React from 'react';
+import React, { useEffect, useRef, useState } from 'react';
 import { UserWarning } from './UserWarning';
-
-const USER_ID = 0;
+import * as todoService from './api/todos';
+import { Filter } from './utils/Filter';
+import { Todo } from './types/todo';
+import { ErrorMessage } from './utils/ErrorMessage';
+import { ErrorNotification } from './components/ErrorNotification';
+import { TodoFooter } from './components/TodoFooter';
+import { TodoList } from './components/TodoList';
+import { TodoHeader } from './components/TodoHeader';
 
 export const App: React.FC = () => {
-  if (!USER_ID) {
+  const [todos, setTodos] = useState<Todo[]>([]);
+  const [errorMessage, setErrorMessage] = useState(ErrorMessage.Empty);
+  const [filter, setFilter] = useState<Filter>(Filter.All);
+  const [query, setQuery] = useState('');
+  const [tempTodo, setTempTodo] = useState<Todo | null>(null);
+
+  const [isLoading, setIsLoading] = useState(false);
+  const [loadingIds, setLoadingIds] = useState<number[]>([]);
+
+  useEffect(() => {
+    todoService
+      .getTodos()
+      .then(setTodos)
+      .catch(() => {
+        setErrorMessage(ErrorMessage.Load);
+      });
+  }, []);
+
+  useEffect(() => {
+    if (!errorMessage) {
+      return;
+    }
+
+    const timer = setTimeout(() => {
+      setErrorMessage(ErrorMessage.Empty);
+    }, 3000);
+
+    return () => clearTimeout(timer);
+  }, [errorMessage]);
+
+  const filteredTodos = todos.filter(todo => {
+    switch (filter) {
+      case 'active':
+        return !todo.completed;
+
+      case 'completed':
+        return todo.completed;
+
+      default:
+        return true;
+    }
+  });
+
+  const addTodo = ({ title, completed, userId }: Omit<Todo, 'id'>) => {
+    setTempTodo({ id: 0, title, completed, userId });
+    setIsLoading(true);
+
+    todoService
+      .createTodo({ title, completed, userId })
+      .then(newTodo => {
+        setTodos(currentTodos => [...currentTodos, newTodo]);
+        setQuery('');
+      })
+      .catch(() => {
+        setErrorMessage(ErrorMessage.Add);
+      })
+      .finally(() => {
+        setTempTodo(null);
+        setIsLoading(false);
+      });
+  };
+
+  const inputRef = useRef<HTMLInputElement>(null);
+
+  useEffect(() => {
+    if (!isLoading) {
+      inputRef.current?.focus();
+    }
+  }, [isLoading]);
+
+  const handleSubmit = (event: React.FormEvent<HTMLFormElement>) => {
+    event.preventDefault();
+
+    if (!query.trim()) {
+      setErrorMessage(ErrorMessage.TitleEmpty);
+
+      return;
+    }
+
+    addTodo({
+      title: query.trim(),
+      completed: false,
+      userId: todoService.USER_ID,
+    });
+  };
+
+  const deleteTodo = (todoId: number, onSuccess?: () => void) => {
+    setLoadingIds(current => [...current, todoId]);
+
+    todoService
+      .deleteTodo(todoId)
+      .then(() => {
+        setTodos(currentTodos =>
+          currentTodos.filter(todo => todo.id !== todoId),
+        );
+
+        onSuccess?.();
+      })
+      .catch(() => {
+        setErrorMessage(ErrorMessage.Delete);
+      })
+      .finally(() => {
+        setLoadingIds(current => current.filter(id => id !== todoId));
+        if (!onSuccess) {
+          inputRef.current?.focus();
+        }
+      });
+  };
+
+  const handleFilterChange = (
+    event: React.MouseEvent<HTMLAnchorElement>,
+    value: Filter,
+  ) => {
+    event.preventDefault();
+    setFilter(value);
+  };
+
+  const clearCompleted = () => {
+    const completedTodos = todos.filter(todo => todo.completed);
+
+    setLoadingIds(current => [
+      ...current,
+      ...completedTodos.map(todo => todo.id),
+    ]);
+
+    Promise.allSettled(
+      completedTodos.map(todo => todoService.deleteTodo(todo.id)),
+    ).then(results => {
+      const failedInds = results.some(result => result.status === 'rejected');
+
+      if (failedInds) {
+        setErrorMessage(ErrorMessage.Delete);
+      }
+
+      const successfulIds = results
+        .map((result, index) =>
+          result.status === 'fulfilled' ? completedTodos[index].id : -1,
+        )
+        .filter(id => id !== -1);
+
+      setTodos(current =>
+        current.filter(todo => !successfulIds.includes(todo.id)),
+      );
+
+      inputRef.current?.focus();
+    });
+  };
+
+  const updateTodo = (updatedTodo: Todo, onSuccess?: () => void) => {
+    setLoadingIds(current => [...current, updatedTodo.id]);
+
+    todoService
+      .updateTodo(updatedTodo)
+      .then(todo => {
+        setTodos(currentTodos => {
+          const newTodos = [...currentTodos];
+          const index = newTodos.findIndex(t => t.id === updatedTodo.id);
+
+          newTodos.splice(index, 1, todo);
+
+          return newTodos;
+        });
+
+        onSuccess?.();
+      })
+      .catch(() => {
+        setErrorMessage(ErrorMessage.Update);
+      })
+      .finally(() => {
+        setLoadingIds(current => current.filter(id => id !== updatedTodo.id));
+      });
+  };
+
+  const toggleAll = () => {
+    const allCompleted = todos.every(todo => todo.completed);
+    const todosToToggle = todos.filter(todo => todo.completed === allCompleted);
+
+    todosToToggle.forEach(todo => {
+      updateTodo({ ...todo, completed: !allCompleted });
+    });
+  };
+
+  if (!todoService.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
+          todos={todos}
+          query={query}
+          inputRef={inputRef}
+          isLoading={isLoading}
+          onQueryChange={setQuery}
+          onSubmit={handleSubmit}
+          toggleAll={toggleAll}
+        />
+
+        {todos.length > 0 && (
+          <TodoList
+            todos={filteredTodos}
+            tempTodo={tempTodo}
+            loadingIds={loadingIds}
+            onDelete={deleteTodo}
+            updateTodo={updateTodo}
+          />
+        )}
+
+        {todos.length > 0 && (
+          <TodoFooter
+            todos={todos}
+            filter={filter}
+            onFilterChange={handleFilterChange}
+            clearCompleted={clearCompleted}
+          />
+        )}
+      </div>
+
+      <ErrorNotification
+        errorMessage={errorMessage}
+        onClose={() => setErrorMessage(ErrorMessage.Empty)}
+      />
+    </div>
   );
 };
diff --git a/src/api/todos.ts b/src/api/todos.ts
new file mode 100644
index 0000000000..d60761bda9
--- /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 = 4193;
+
+export const getTodos = () => {
+  return client.get<Todo[]>(`/todos?userId=${USER_ID}`);
+};
+
+export const deleteTodo = (todoId: number) => {
+  return client.delete<number>(`/todos/${todoId}`);
+};
+
+export const createTodo = ({ title, completed, userId }: Omit<Todo, 'id'>) => {
+  return client.post<Todo>('/todos', { title, completed, userId });
+};
+
+export const updateTodo = ({ id, title, completed, userId }: Todo) => {
+  return client.patch<Todo>(`/todos/${id}`, { title, completed, userId });
+};
diff --git a/src/components/ErrorNotification/ErrorNotification.tsx b/src/components/ErrorNotification/ErrorNotification.tsx
new file mode 100644
index 0000000000..17dc21e3ac
--- /dev/null
+++ b/src/components/ErrorNotification/ErrorNotification.tsx
@@ -0,0 +1,31 @@
+import classNames from 'classnames';
+
+import React from 'react';
+
+type Props = {
+  errorMessage: string;
+  onClose: () => void;
+};
+
+export const ErrorNotification: React.FC<Props> = ({
+  errorMessage,
+  onClose,
+}) => (
+  <div
+    data-cy="ErrorNotification"
+    className={classNames(
+      'notification is-danger is-light has-text-weight-normal',
+      {
+        hidden: !errorMessage,
+      },
+    )}
+  >
+    <button
+      data-cy="HideErrorButton"
+      type="button"
+      className="delete"
+      onClick={onClose}
+    />
+    {errorMessage}
+  </div>
+);
diff --git a/src/components/ErrorNotification/index.ts b/src/components/ErrorNotification/index.ts
new file mode 100644
index 0000000000..612d424f31
--- /dev/null
+++ b/src/components/ErrorNotification/index.ts
@@ -0,0 +1 @@
+export { ErrorNotification } from './ErrorNotification';
diff --git a/src/components/TodoFooter/TodoFooter.tsx b/src/components/TodoFooter/TodoFooter.tsx
new file mode 100644
index 0000000000..c6b3b280cc
--- /dev/null
+++ b/src/components/TodoFooter/TodoFooter.tsx
@@ -0,0 +1,74 @@
+import classNames from 'classnames';
+
+import React from 'react';
+import { Todo } from '../../types/todo';
+import { Filter } from '../../utils/Filter';
+
+type Props = {
+  todos: Todo[];
+  filter: Filter;
+  onFilterChange: (
+    event: React.MouseEvent<HTMLAnchorElement>,
+    value: Filter,
+  ) => void;
+  clearCompleted: () => void;
+};
+
+export const TodoFooter: React.FC<Props> = ({
+  todos,
+  filter,
+  onFilterChange,
+  clearCompleted,
+}) => {
+  const filterLinks = [
+    { label: 'All', value: Filter.All, href: '#/', dataCy: 'FilterLinkAll' },
+
+    {
+      label: 'Active',
+      value: Filter.Active,
+      href: '#/active',
+      dataCy: 'FilterLinkActive',
+    },
+
+    {
+      label: 'Completed',
+      value: Filter.Completed,
+      href: '#/completed',
+      dataCy: 'FilterLinkCompleted',
+    },
+  ];
+
+  return (
+    <footer className="todoapp__footer" data-cy="Footer">
+      <span className="todo-count" data-cy="TodosCounter">
+        {todos.filter(t => !t.completed).length} items left
+      </span>
+
+      <nav className="filter" data-cy="Filter">
+        {filterLinks.map(({ label, value, href, dataCy }) => (
+          <a
+            key={value}
+            href={href}
+            className={classNames('filter__link', {
+              selected: filter === value,
+            })}
+            data-cy={dataCy}
+            onClick={event => onFilterChange(event, value)}
+          >
+            {label}
+          </a>
+        ))}
+      </nav>
+
+      <button
+        type="button"
+        className="todoapp__clear-completed"
+        data-cy="ClearCompletedButton"
+        disabled={!todos.some(t => t.completed)}
+        onClick={clearCompleted}
+      >
+        Clear completed
+      </button>
+    </footer>
+  );
+};
diff --git a/src/components/TodoFooter/index.ts b/src/components/TodoFooter/index.ts
new file mode 100644
index 0000000000..c05cfe1962
--- /dev/null
+++ b/src/components/TodoFooter/index.ts
@@ -0,0 +1 @@
+export { TodoFooter } from './TodoFooter';
diff --git a/src/components/TodoHeader/TodoHeader.tsx b/src/components/TodoHeader/TodoHeader.tsx
new file mode 100644
index 0000000000..03b065c47c
--- /dev/null
+++ b/src/components/TodoHeader/TodoHeader.tsx
@@ -0,0 +1,52 @@
+import classNames from 'classnames';
+
+import React from 'react';
+import { Todo } from '../../types/todo';
+
+type Props = {
+  todos: Todo[];
+  query: string;
+  isLoading: boolean;
+  inputRef: React.RefObject<HTMLInputElement>;
+  onQueryChange: (value: string) => void;
+  onSubmit: (event: React.FormEvent<HTMLFormElement>) => void;
+  toggleAll: () => void;
+};
+
+export const TodoHeader: React.FC<Props> = ({
+  todos,
+  query,
+  isLoading,
+  inputRef,
+  onQueryChange,
+  onSubmit,
+  toggleAll,
+}) => (
+  <header className="todoapp__header">
+    {todos.length > 0 && (
+      <button
+        type="button"
+        className={classNames('todoapp__toggle-all', {
+          active: todos.every(todo => todo.completed),
+        })}
+        data-cy="ToggleAllButton"
+        onClick={toggleAll}
+      />
+    )}
+
+    <form onSubmit={onSubmit}>
+      <input
+        ref={inputRef}
+        data-cy="NewTodoField"
+        type="text"
+        className="todoapp__new-todo"
+        placeholder="What needs to be done?"
+        value={query}
+        onChange={event => {
+          onQueryChange(event.target.value);
+        }}
+        disabled={isLoading}
+      />
+    </form>
+  </header>
+);
diff --git a/src/components/TodoHeader/index.ts b/src/components/TodoHeader/index.ts
new file mode 100644
index 0000000000..9a6486ad6f
--- /dev/null
+++ b/src/components/TodoHeader/index.ts
@@ -0,0 +1 @@
+export { TodoHeader } from './TodoHeader';
diff --git a/src/components/TodoItem/TodoItem.tsx b/src/components/TodoItem/TodoItem.tsx
new file mode 100644
index 0000000000..c99a162200
--- /dev/null
+++ b/src/components/TodoItem/TodoItem.tsx
@@ -0,0 +1,134 @@
+/* eslint-disable jsx-a11y/label-has-associated-control */
+/* eslint-disable jsx-a11y/control-has-associated-label */
+import classNames from 'classnames';
+
+import React, { useEffect, useRef, useState } from 'react';
+import { Todo } from '../../types/todo';
+
+type Props = {
+  todo: Todo;
+  isLoading?: boolean;
+  onDelete?: (value: number, onSuccess?: () => void) => void;
+  updateTodo?: (updatedTodo: Todo, onSucces?: () => void) => void;
+};
+
+export const TodoItem: React.FC<Props> = ({
+  todo,
+  isLoading = false,
+  onDelete,
+  updateTodo,
+}) => {
+  const [editingId, setEditingId] = useState<number | null>(null);
+  const [editTitle, setEditTitle] = useState('');
+
+  const handleEdit = (event?: React.FormEvent<HTMLFormElement>) => {
+    event?.preventDefault();
+
+    if (editingId === null) {
+      return;
+    }
+
+    if (!editTitle.trim()) {
+      onDelete?.(todo.id, () => setEditingId(null));
+
+      return;
+    }
+
+    if (editTitle.trim() === todo.title) {
+      setEditingId(null);
+
+      return;
+    }
+
+    updateTodo?.({ ...todo, title: editTitle.trim() }, () => {
+      setEditingId(null);
+    });
+  };
+
+  const editInputRef = useRef<HTMLInputElement>(null);
+
+  useEffect(() => {
+    if (editingId === todo.id) {
+      editInputRef.current?.focus();
+    }
+  }, [editingId, todo.id]);
+
+  const doubleClick = () => {
+    setEditingId(todo.id);
+    setEditTitle(todo.title);
+  };
+
+  return (
+    <div
+      key={todo.id}
+      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={() => {
+            updateTodo?.({ ...todo, completed: !todo.completed });
+          }}
+        />
+      </label>
+
+      {editingId === todo.id ? (
+        <form onSubmit={handleEdit}>
+          <input
+            ref={editInputRef}
+            data-cy="TodoTitleField"
+            type="text"
+            className="todo__title-field"
+            placeholder="Empty todo will be deleted"
+            value={editTitle}
+            onChange={event => {
+              setEditTitle(event.target.value);
+            }}
+            onBlur={() => handleEdit()}
+            onKeyUp={event => {
+              if (event.key === 'Escape') {
+                setEditTitle(todo.title);
+                setEditingId(null);
+              }
+            }}
+          />
+        </form>
+      ) : (
+        <span
+          data-cy="TodoTitle"
+          className="todo__title"
+          onDoubleClick={doubleClick}
+        >
+          {todo.title}
+        </span>
+      )}
+
+      {editingId !== todo.id && (
+        <button
+          type="button"
+          className="todo__remove"
+          data-cy="TodoDelete"
+          onClick={() => onDelete?.(todo.id)}
+        >
+          ×
+        </button>
+      )}
+
+      <div
+        data-cy="TodoLoader"
+        className={classNames('modal overlay', {
+          'is-active': isLoading,
+        })}
+      >
+        <div className="modal-background has-background-white-ter" />
+        <div className="loader" />
+      </div>
+    </div>
+  );
+};
diff --git a/src/components/TodoItem/index.ts b/src/components/TodoItem/index.ts
new file mode 100644
index 0000000000..e8da085412
--- /dev/null
+++ b/src/components/TodoItem/index.ts
@@ -0,0 +1 @@
+export { TodoItem } from './TodoItem';
diff --git a/src/components/TodoList/TodoList.tsx b/src/components/TodoList/TodoList.tsx
new file mode 100644
index 0000000000..9268aaf1c5
--- /dev/null
+++ b/src/components/TodoList/TodoList.tsx
@@ -0,0 +1,32 @@
+import React from 'react';
+import { Todo } from '../../types/todo';
+import { TodoItem } from '../TodoItem';
+
+type Props = {
+  todos: Todo[];
+  tempTodo: Todo | null;
+  loadingIds: number[];
+  onDelete: (value: number) => void;
+  updateTodo: (updateTodo: Todo) => void;
+};
+
+export const TodoList: React.FC<Props> = ({
+  todos,
+  tempTodo,
+  loadingIds,
+  onDelete,
+  updateTodo,
+}) => (
+  <section className="todoapp__main" data-cy="TodoList">
+    {todos.map(todo => (
+      <TodoItem
+        key={todo.id}
+        todo={todo}
+        isLoading={loadingIds.includes(todo.id)}
+        onDelete={onDelete}
+        updateTodo={updateTodo}
+      />
+    ))}
+    {tempTodo && <TodoItem todo={tempTodo} isLoading onDelete={onDelete} />}
+  </section>
+);
diff --git a/src/components/TodoList/index.ts b/src/components/TodoList/index.ts
new file mode 100644
index 0000000000..d0c1712ba4
--- /dev/null
+++ b/src/components/TodoList/index.ts
@@ -0,0 +1 @@
+export { TodoList } from './TodoList';
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/ErrorMessage.ts b/src/utils/ErrorMessage.ts
new file mode 100644
index 0000000000..de544ad3cb
--- /dev/null
+++ b/src/utils/ErrorMessage.ts
@@ -0,0 +1,8 @@
+export enum ErrorMessage {
+  TitleEmpty = 'Title should not be empty',
+  Load = 'Unable to load todos',
+  Add = 'Unable to add a todo',
+  Delete = 'Unable to delete a todo',
+  Update = 'Unable to update a todo',
+  Empty = '',
+}
diff --git a/src/utils/Filter.ts b/src/utils/Filter.ts
new file mode 100644
index 0000000000..174408fd69
--- /dev/null
+++ b/src/utils/Filter.ts
@@ -0,0 +1,5 @@
+export enum Filter {
+  All = 'all',
+  Active = 'active',
+  Completed = 'completed',
+}
diff --git a/src/utils/fetchClient.ts b/src/utils/fetchClient.ts
new file mode 100644
index 0000000000..33b2e0bd2a
--- /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: <T>(url: string) => request<T>(url, 'DELETE'),
+};