diff --git a/README.md b/README.md
index 47a1add059..1aa92e37d3 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://Sviatoslav593.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..dbd6d0676b 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -8701,6 +8701,7 @@
       "version": "18.3.1",
       "resolved": "https://registry.npmjs.org/react/-/react-18.3.1.tgz",
       "integrity": "sha512-wS+hAgJShR0KhEvPJArfuPVN1+Hz1t0Y6n5jLrGQbkb4urgPE/0Rve+1kMB1v/oWgHgm4WIcV+i7F2pTVj+2iQ==",
+      "license": "MIT",
       "dependencies": {
         "loose-envify": "^1.1.0"
       },
diff --git a/src/App.tsx b/src/App.tsx
index 81e011f432..4a1a73b899 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -1,26 +1,290 @@
-/* eslint-disable max-len */
+/* eslint-disable jsx-a11y/label-has-associated-control */
 /* eslint-disable jsx-a11y/control-has-associated-label */
-import React from 'react';
+import React, { useEffect, useState } from 'react';
 import { UserWarning } from './UserWarning';
-
-const USER_ID = 0;
+import {
+  addTodos,
+  deleteTodos,
+  getTodos,
+  updateTodos,
+  USER_ID,
+} from './api/todos';
+import { TodoForm } from './components/TodoForm';
+import { Todo } from './types/Todo';
+import { TodoList } from './components/TodoList';
+import { Footer } from './components/Footer';
+import cn from 'classnames';
+import { Selected } from './types/enums/Selected';
+import { ErrorMessage } from './types/enums/ErrorMessage';
 
 export const App: React.FC = () => {
+  const [todos, setTodos] = useState<Todo[]>([]);
+  const [selected, setSelected] = useState<Selected>(Selected.all);
+
+  const [tempTodo, setTempTodo] = useState<Todo | null>(null);
+  const [todoLoading, setTodoLoading] = useState(false);
+  const [todoIdLoading, setTodoIdLoading] = useState<number | null>(null);
+
+  const [todosIdsLoading, setTodosIdsLoading] = useState<number[]>([]);
+
+  const [visibleTodos, setVisibleTodos] = useState<Todo[]>([]);
+
+  useEffect(() => {
+    setVisibleTodos(
+      todos.filter(todo => {
+        if (selected === Selected.completed) {
+          return todo.completed;
+        }
+
+        if (selected === Selected.active) {
+          return !todo.completed;
+        }
+
+        return todos;
+      }),
+    );
+  }, [selected, todos]);
+
+  // const filteredTodos = todos.filter(todo => {
+  //   if (filter === FilterField.completed) {
+  //     return todo.completed;
+  //   }
+
+  //   if (filter === FilterField.active) {
+  //     return !todo.completed;
+  //   }
+
+  //   return todos;
+  // });
+
+  const [errorMessage, setErrorMessage] = useState<ErrorMessage>(
+    ErrorMessage.noErrors,
+  );
+
+  useEffect(() => {
+    setErrorMessage(ErrorMessage.noErrors);
+
+    getTodos()
+      .then(setTodos)
+      .catch(() => setErrorMessage(ErrorMessage.loadError));
+  }, []);
+
+  useEffect(() => {
+    if (errorMessage) {
+      setTimeout(() => {
+        setErrorMessage(ErrorMessage.noErrors);
+      }, 3000);
+    }
+  }, [errorMessage]);
+
+  const handleActiveTodosButton = () => {
+    setSelected(Selected.active);
+  };
+
+  const handleCompletedTodosButton = () => {
+    setSelected(Selected.completed);
+  };
+
+  const handleAllTodosButton = () => {
+    setSelected(Selected.all);
+  };
+
+  const addTodo = (title: string) => {
+    setTodoLoading(true);
+    setErrorMessage(ErrorMessage.noErrors);
+    setTempTodo({
+      id: 0,
+      title: title,
+      userId: USER_ID,
+      completed: false,
+    });
+
+    return addTodos(title)
+      .then(newTodo => setTodos(currentTodos => [...currentTodos, newTodo]))
+      .catch(error => {
+        setErrorMessage(ErrorMessage.addError);
+        throw error;
+      })
+      .finally(() => {
+        setTempTodo(null);
+        setTodoLoading(false);
+      });
+  };
+
+  const deleteTodo = (todoId: number) => {
+    setTodoIdLoading(todoId);
+
+    return deleteTodos(todoId)
+      .then(() => {
+        setTodos(currentTodos => {
+          return [...currentTodos.filter(todo => todo.id !== todoId)];
+        });
+      })
+      .catch(error => {
+        setErrorMessage(ErrorMessage.deleteError);
+        setTodos(todos);
+        throw error;
+      })
+      .finally(() => {
+        setTodoIdLoading(null);
+      });
+  };
+
+  const updateTodo = (id: number, completed: boolean, title: string) => {
+    setErrorMessage(ErrorMessage.noErrors);
+    setTodoIdLoading(id);
+
+    return updateTodos(id, completed, title)
+      .then(updatedTodo => {
+        setTodos(currentTodos => {
+          const newTodos = [...currentTodos];
+          const index = newTodos.findIndex(todo => {
+            return todo.id === id;
+          });
+
+          newTodos.splice(index, 1, updatedTodo);
+
+          return newTodos;
+        });
+      })
+      .catch(error => {
+        setErrorMessage(ErrorMessage.updateError);
+
+        throw error;
+      })
+      .finally(() => setTodoIdLoading(null));
+  };
+
+  const SetAllTodosCompleted = () => {
+    const uncompletedTodos = todos.filter(todo => !todo.completed);
+    const completedTodos = todos.filter(todo => todo.completed);
+
+    const todosToMap =
+      todos.length === completedTodos.length ? todos : uncompletedTodos;
+
+    setTodosIdsLoading(uncompletedTodos.map(todo => todo.id));
+
+    return Promise.all(
+      todosToMap.map(uncompletedTodo => {
+        updateTodos(
+          uncompletedTodo.id,
+          !uncompletedTodo.completed,
+          uncompletedTodo.title,
+        )
+          .then(updatedTodo =>
+            setTodos(currentTodos => {
+              const newTodos = [...currentTodos];
+              const index = currentTodos.findIndex(
+                todo => todo.id === updatedTodo.id,
+              );
+
+              newTodos.splice(index, 1, updatedTodo);
+
+              return newTodos;
+            }),
+          )
+          .catch(() => {
+            setErrorMessage(ErrorMessage.updateError);
+          })
+          .finally(() => setTodosIdsLoading([]));
+      }),
+    );
+  };
+
+  const handleAllActiveDelete = () => {
+    setTodoLoading(true);
+
+    const completedTodos = todos.filter(todo => todo.completed);
+
+    setTodosIdsLoading(completedTodos.map(todo => todo.id));
+
+    return Promise.all(
+      completedTodos.map(completedTodo =>
+        deleteTodos(completedTodo.id)
+          .then(() => {
+            setTodos(current =>
+              current.filter(todo => todo.id !== completedTodo.id),
+            );
+          })
+          .catch(() => {
+            setErrorMessage(ErrorMessage.deleteError);
+          }),
+      ),
+    ).finally(() => setTodosIdsLoading([]));
+  };
+
   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>
+    <div className="todoapp">
+      <h1 className="todoapp__title">todos</h1>
+
+      <div className="todoapp__content">
+        <header className="todoapp__header">
+          {/* Add a todo on form submit */}
+          <TodoForm
+            setError={setErrorMessage}
+            onAdd={addTodo}
+            setAllCompleted={SetAllTodosCompleted}
+            todos={todos}
+          />
+        </header>
+        {todos && errorMessage !== 'Unable to load todos' && (
+          <TodoList
+            tempTodo={tempTodo}
+            isLoading={todoLoading}
+            todoIdLoading={todoIdLoading}
+            todos={visibleTodos}
+            onDelete={deleteTodo}
+            todosIdsLoading={todosIdsLoading}
+            updateTodo={updateTodo}
+          />
+        )}
+
+        {/* Hide the footer if there are no todos */}
+        {todos.length > 0 && (
+          <Footer
+            handleActiveTodosButton={handleActiveTodosButton}
+            handleCompletedTodosButton={handleCompletedTodosButton}
+            handleAllTodosButton={handleAllTodosButton}
+            todos={todos}
+            selected={selected}
+            handleAllActiveDelete={handleAllActiveDelete}
+          />
+        )}
+      </div>
 
-      <p className="subtitle">Styles are already copied</p>
-    </section>
+      {/* DON'T use conditional rendering to hide the notification */}
+      {/* Add the 'hidden' class to hide the message smoothly */}
+
+      <div
+        data-cy="ErrorNotification"
+        className={cn(
+          'notification is-danger is-light has-text-weight-normal',
+          {
+            hidden: !errorMessage,
+          },
+        )}
+      >
+        <button
+          onClick={() => setErrorMessage(ErrorMessage.noErrors)}
+          data-cy="HideErrorButton"
+          type="button"
+          className="delete"
+        />
+        {/* show only one message at a time */}
+        {errorMessage}
+        <br />
+        {/* Title should not be empty
+            <br />
+            Unable to add a todo
+            <br />
+            Unable to delete a todo
+            <br />
+            Unable to update a todo */}
+      </div>
+    </div>
   );
 };
diff --git a/src/api/todos.ts b/src/api/todos.ts
new file mode 100644
index 0000000000..e635a4f490
--- /dev/null
+++ b/src/api/todos.ts
@@ -0,0 +1,40 @@
+import { Todo } from '../types/Todo';
+import { client } from '../utils/fetchClient';
+
+export const USER_ID = 4147;
+
+export const getTodos = () => {
+  return client.get<Todo[]>(`/todos?userId=${USER_ID}`);
+};
+
+// Add more methods here
+
+export const addTodos = (
+  title: string,
+  completed = false,
+  userId = USER_ID,
+) => {
+  return client.post<Todo>(`/todos`, {
+    title,
+    completed,
+    userId,
+  });
+};
+
+export const deleteTodos = (todoId: number) => {
+  return client.delete(`/todos/${todoId}`);
+};
+
+export const updateTodos = (
+  todoId: number,
+  completed: boolean,
+  title?: string,
+  userId = USER_ID,
+) => {
+  return client.patch<Todo>(`/todos/${todoId}`, {
+    todoId,
+    completed,
+    title,
+    userId,
+  });
+};
diff --git a/src/components/Footer.tsx b/src/components/Footer.tsx
new file mode 100644
index 0000000000..c8721fb1c7
--- /dev/null
+++ b/src/components/Footer.tsx
@@ -0,0 +1,92 @@
+import React, { useEffect, useState } from 'react';
+import { Todo } from '../types/Todo';
+import cn from 'classnames';
+import { Selected } from '../types/enums/Selected';
+
+type Props = {
+  todos: Todo[];
+  handleActiveTodosButton: () => void;
+  handleCompletedTodosButton: () => void;
+  handleAllTodosButton: () => void;
+  handleAllActiveDelete: () => void;
+  selected: Selected;
+};
+
+export const Footer: React.FC<Props> = ({
+  todos,
+  handleActiveTodosButton,
+  handleCompletedTodosButton,
+  handleAllTodosButton,
+  handleAllActiveDelete,
+  selected,
+}) => {
+  const [uncompletedTodosLength, setUncompletedTodosLength] = useState(
+    todos.filter(todo => !todo.completed).length,
+  );
+
+  const [completedTodosLength, setCompletedTodosLength] = useState(
+    todos.filter(todo => todo.completed).length,
+  );
+
+  useEffect(() => {
+    setUncompletedTodosLength(todos.filter(todo => !todo.completed).length);
+    setCompletedTodosLength(todos.filter(todo => todo.completed).length);
+  }, [todos]);
+
+  return (
+    <footer className="todoapp__footer" data-cy="Footer">
+      <span className="todo-count" data-cy="TodosCounter">
+        {uncompletedTodosLength} items left
+      </span>
+
+      {/* Active link should have the 'selected' class */}
+      <nav className="filter" data-cy="Filter">
+        <a
+          onClick={handleAllTodosButton}
+          href="#/"
+          className={cn('filter__link', {
+            selected: selected === Selected.all,
+          })}
+          data-cy="FilterLinkAll"
+        >
+          All
+        </a>
+
+        <a
+          onClick={handleActiveTodosButton}
+          id="active_link"
+          href="#/active"
+          className={cn('filter__link', {
+            selected: selected === Selected.active,
+          })}
+          data-cy="FilterLinkActive"
+        >
+          Active
+        </a>
+
+        <a
+          onClick={handleCompletedTodosButton}
+          id="completed_link"
+          href="#/completed"
+          className={cn('filter__link', {
+            selected: selected === Selected.completed,
+          })}
+          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"
+        onClick={handleAllActiveDelete}
+        disabled={!completedTodosLength}
+      >
+        Clear completed
+      </button>
+    </footer>
+  );
+};
diff --git a/src/components/TodoForm.tsx b/src/components/TodoForm.tsx
new file mode 100644
index 0000000000..3b46fc5c88
--- /dev/null
+++ b/src/components/TodoForm.tsx
@@ -0,0 +1,84 @@
+import React, { useEffect, useRef, useState } from 'react';
+import { ErrorMessage } from '../types/enums/ErrorMessage';
+import { Todo } from '../types/Todo';
+import cn from 'classnames';
+
+type Props = {
+  onAdd: (arg0: string) => Promise<void>;
+  setError: React.Dispatch<React.SetStateAction<ErrorMessage>>;
+  setAllCompleted: () => Promise<void[]>;
+  todos: Todo[];
+};
+
+export const TodoForm: React.FC<Props> = ({
+  onAdd,
+  setError,
+  setAllCompleted,
+  todos,
+}) => {
+  const isToggleAllActive =
+    todos.length > 0 &&
+    todos.length === todos.filter(todo => todo.completed).length;
+
+  const [value, setValue] = useState('');
+  const [isDisabled, setIsDisabled] = useState(false);
+
+  const inputRef = useRef<HTMLInputElement>(null);
+
+  useEffect(() => {
+    inputRef.current?.focus();
+  });
+
+  const handleInput = (event: React.ChangeEvent<HTMLInputElement>) => {
+    setValue(event.target.value);
+  };
+
+  const handleSubmit = (event: React.FormEvent<HTMLFormElement>) => {
+    event.preventDefault();
+    const normalizedTitle = value.trim();
+
+    setIsDisabled(true);
+
+    if (normalizedTitle.length === 0) {
+      setIsDisabled(false);
+
+      return setError(ErrorMessage.emptyTitle);
+    }
+
+    return onAdd(normalizedTitle)
+      .then(() => {
+        setValue('');
+      })
+      .finally(() => {
+        setIsDisabled(false);
+      });
+  };
+
+  return (
+    <>
+      {/* this button should have `active` class only if all todos are completed */}
+      {todos.length > 0 && (
+        <button
+          type="button"
+          className={cn('todoapp__toggle-all', {
+            active: isToggleAllActive,
+          })}
+          data-cy="ToggleAllButton"
+          onClick={setAllCompleted}
+        />
+      )}
+      <form onSubmit={handleSubmit}>
+        <input
+          data-cy="NewTodoField"
+          type="text"
+          className="todoapp__new-todo"
+          placeholder="What needs to be done?"
+          ref={inputRef}
+          value={value}
+          onChange={handleInput}
+          disabled={isDisabled}
+        />
+      </form>
+    </>
+  );
+};
diff --git a/src/components/TodoList.tsx b/src/components/TodoList.tsx
new file mode 100644
index 0000000000..ab5f8fbaa6
--- /dev/null
+++ b/src/components/TodoList.tsx
@@ -0,0 +1,211 @@
+import React, { useEffect, useRef, useState } from 'react';
+import { Todo } from '../types/Todo';
+import cn from 'classnames';
+
+type Props = {
+  todos: Todo[];
+  isLoading: boolean;
+  tempTodo: Todo | null;
+  onDelete: (todoId: number) => Promise<void>;
+  todoIdLoading: number | null;
+  todosIdsLoading: number[];
+  updateTodo: (id: number, completed: boolean, title: string) => Promise<void>;
+};
+
+export const TodoList: React.FC<Props> = ({
+  todos,
+  isLoading,
+  tempTodo,
+  onDelete,
+  todoIdLoading,
+  todosIdsLoading,
+  updateTodo,
+}) => {
+  const [title, setTitle] = useState('');
+  const [editingTodo, setEditingTodo] = useState<Todo | null>(null);
+
+  const [isSaving, setIsSaving] = useState(false);
+
+  const inputEditRef = useRef<HTMLInputElement | null>(null);
+
+  useEffect(() => {
+    inputEditRef.current?.focus();
+  });
+
+  const handleDoubleClick = (currentTodo: Todo) => {
+    setEditingTodo(currentTodo);
+    setTitle(currentTodo.title.trim());
+  };
+
+  const handleKeyUp = (e: React.KeyboardEvent<HTMLInputElement>) => {
+    if (e.key === 'Escape') {
+      setEditingTodo(null);
+    }
+  };
+
+  const handleSubmit = (event: React.FormEvent<HTMLFormElement>) => {
+    event.preventDefault();
+
+    setIsSaving(true);
+
+    const normalizedTitle = title.trim();
+
+    if (title.length === 0 && editingTodo) {
+      onDelete(editingTodo.id).catch(() => setEditingTodo(editingTodo));
+    } else if (editingTodo && title.length > 0) {
+      updateTodo(editingTodo.id, editingTodo.completed, normalizedTitle)
+        .catch(() => {
+          setEditingTodo(editingTodo);
+        })
+        .finally(() => setIsSaving(false));
+    }
+  };
+
+  const handleBlur = () => {
+    const normalizedTitle = title.trim();
+
+    setEditingTodo(null);
+
+    if (isSaving) {
+      return;
+    }
+
+    if (title.length === 0 && editingTodo) {
+      onDelete(editingTodo.id).catch(() => setEditingTodo(editingTodo));
+    } else if (editingTodo && title.length > 0) {
+      updateTodo(editingTodo.id, editingTodo.completed, normalizedTitle).catch(
+        () => {
+          setEditingTodo(editingTodo);
+        },
+      );
+    }
+  };
+
+  return (
+    <section className="todoapp__main" data-cy="TodoList">
+      {/* This is a completed todo */}
+
+      {todos.map(todo => {
+        return (
+          <div
+            key={todo.id}
+            data-cy="Todo"
+            className={cn('todo', {
+              completed: todo.completed,
+            })}
+          >
+            <label className="todo__status-label">
+              <input
+                data-cy="TodoStatus"
+                type="checkbox"
+                className="todo__status"
+                checked={todo.completed}
+                aria-label="ToDo-Status"
+                onChange={() =>
+                  updateTodo(todo.id, !todo.completed, todo.title)
+                }
+              />
+            </label>
+
+            {editingTodo && todo.id === editingTodo.id ? (
+              <>
+                <form onSubmit={handleSubmit}>
+                  <input
+                    data-cy="TodoTitleField"
+                    type="text"
+                    className="todo__title-field"
+                    placeholder="Empty todo will be deleted"
+                    value={title}
+                    onChange={event => setTitle(event.target.value)}
+                    ref={inputEditRef}
+                    onKeyUp={handleKeyUp}
+                    onBlur={handleBlur}
+                  />
+                </form>
+
+                <div
+                  data-cy="TodoLoader"
+                  className={cn('modal overlay', {
+                    'is-active':
+                      todo.id === todoIdLoading ||
+                      todosIdsLoading.includes(todo.id),
+                  })}
+                >
+                  <div className="modal-background has-background-white-ter" />
+                  <div className="loader" />
+                </div>
+              </>
+            ) : (
+              <>
+                <span
+                  data-cy="TodoTitle"
+                  className="todo__title"
+                  onDoubleClick={() => handleDoubleClick(todo)}
+                >
+                  {todo.title}
+                </span>
+
+                <button
+                  onClick={() => onDelete(todo.id)}
+                  type="button"
+                  className="todo__remove"
+                  data-cy="TodoDelete"
+                >
+                  ×
+                </button>
+
+                <div
+                  data-cy="TodoLoader"
+                  className={cn('modal overlay', {
+                    'is-active':
+                      todo.id === todoIdLoading ||
+                      todosIdsLoading.includes(todo.id),
+                  })}
+                >
+                  <div className="modal-background has-background-white-ter" />
+                  <div className="loader" />
+                </div>
+              </>
+            )}
+
+            {/* Remove button appears only on hover */}
+
+            {/* overlay will cover the todo while it is being deleted or updated */}
+          </div>
+        );
+      })}
+
+      {tempTodo !== null && (
+        <div data-cy="Todo" className="todo">
+          <label className="todo__status-label">
+            <input
+              data-cy="TodoStatus"
+              type="checkbox"
+              className="todo__status"
+              aria-label="ToDo-Status"
+            />
+          </label>
+
+          <span data-cy="TodoTitle" className="todo__title">
+            {tempTodo.title}
+          </span>
+
+          <button type="button" className="todo__remove" data-cy="TodoDelete">
+            ×
+          </button>
+
+          {/* 'is-active' class puts this modal on top of the todo */}
+          <div
+            data-cy="TodoLoader"
+            className={cn('modal overlay', {
+              'is-active': isLoading,
+            })}
+          >
+            <div className="modal-background has-background-white-ter" />
+            <div className="loader" />
+          </div>
+        </div>
+      )}
+    </section>
+  );
+};
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/enums/ErrorMessage.ts b/src/types/enums/ErrorMessage.ts
new file mode 100644
index 0000000000..7a005d5acd
--- /dev/null
+++ b/src/types/enums/ErrorMessage.ts
@@ -0,0 +1,8 @@
+export enum ErrorMessage {
+  emptyTitle = 'Title should not be empty',
+  loadError = 'Unable to load todos',
+  addError = 'Unable to add a todo',
+  deleteError = 'Unable to delete a todo',
+  updateError = 'Unable to update a todo',
+  noErrors = '',
+}
diff --git a/src/types/enums/Selected.ts b/src/types/enums/Selected.ts
new file mode 100644
index 0000000000..0ec93e6bd0
--- /dev/null
+++ b/src/types/enums/Selected.ts
@@ -0,0 +1,5 @@
+export enum Selected {
+  'all',
+  'completed',
+  'active',
+}
diff --git a/src/utils/fetchClient.ts b/src/utils/fetchClient.ts
new file mode 100644
index 0000000000..708ac4c17b
--- /dev/null
+++ b/src/utils/fetchClient.ts
@@ -0,0 +1,46 @@
+/* eslint-disable @typescript-eslint/no-explicit-any */
+const BASE_URL = 'https://mate.academy/students-api';
+
+// returns a promise resolved after a given delay
+function wait(delay: number) {
+  return new Promise(resolve => {
+    setTimeout(resolve, delay);
+  });
+}
+
+// To have autocompletion and avoid mistypes
+type RequestMethod = 'GET' | 'POST' | 'PATCH' | 'DELETE';
+
+function request<T>(
+  url: string,
+  method: RequestMethod = 'GET',
+  data: any = null, // we can send any data to the server
+): Promise<T> {
+  const options: RequestInit = { method };
+
+  if (data) {
+    // We add body and Content-Type only for the requests with data
+    options.body = JSON.stringify(data);
+    options.headers = {
+      'Content-Type': 'application/json; charset=UTF-8',
+    };
+  }
+
+  // DON'T change the delay it is required for tests
+  return wait(100)
+    .then(() => fetch(BASE_URL + url, options))
+    .then(response => {
+      if (!response.ok) {
+        throw new Error();
+      }
+
+      return response.json();
+    });
+}
+
+export const client = {
+  get: <T>(url: string) => request<T>(url),
+  post: <T>(url: string, data: any) => request<T>(url, 'POST', data),
+  patch: <T>(url: string, data: any) => request<T>(url, 'PATCH', data),
+  delete: (url: string) => request(url, 'DELETE'),
+};
diff --git a/tsconfig.json b/tsconfig.json
index cfb168bb26..78bb00370b 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -1,9 +1,8 @@
 {
   "extends": "@mate-academy/students-ts-config",
-  "include": [
-    "src"
-  ],
+  "include": ["src"],
   "compilerOptions": {
+    "jsx": "react",
     "sourceMap": false,
     "types": ["node", "cypress"]
   }