diff --git a/README.md b/README.md
index af7dae81f6..3455fdb3d5 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://DenisGurskiy.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..d52ae97a73 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -1,24 +1,12 @@
-/* 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 { TodosProvider } from './TodosContext';
+import { TodoApp } from './TodoApp/TodoApp';
 
 export const App: React.FC = () => {
-  if (!USER_ID) {
-    return <UserWarning />;
-  }
-
   return (
-    <section className="section container">
-      <p className="title is-4">
-        Copy all you need from the prev task:
-        <br />
-        <a href="https://github.com/mate-academy/react_todo-app-add-and-delete#react-todo-app-add-and-delete">React Todo App - Add and Delete</a>
-      </p>
-
-      <p className="subtitle">Styles are already copied</p>
-    </section>
+    <TodosProvider>
+      <TodoApp />
+    </TodosProvider>
   );
 };
diff --git a/src/TodoApp/TodoApp.tsx b/src/TodoApp/TodoApp.tsx
new file mode 100644
index 0000000000..6bcb604c70
--- /dev/null
+++ b/src/TodoApp/TodoApp.tsx
@@ -0,0 +1,302 @@
+/* eslint-disable max-len */
+/* eslint-disable jsx-a11y/control-has-associated-label */
+import React, {
+  useContext, useEffect, useState,
+} from 'react';
+import classNames from 'classnames';
+
+import { Filter } from '../types/Filter';
+import { TodosFilter } from '../components/TodosFilter/TodosFilter';
+import { TodosList } from '../components/TodosList/TodosList';
+import { TodosContext } from '../TodosContext';
+import { USER_ID } from '../utils/userId';
+import { addTodos, deleteTodo, updateTodo } from '../api/todos';
+import { Todo } from '../types/Todo';
+
+export const TodoApp: React.FC = () => {
+  const {
+    todos,
+    setTodos,
+    errorMessage,
+    setErrorMessage,
+    errorDiv,
+    inputTitle,
+    tempTodo,
+    setTempTodo,
+  } = useContext(TodosContext);
+  const [title, setTitle] = useState('');
+  const [filter, setFilter] = useState(Filter.ALL);
+  const [isDeleteCompleted, setIsDeleteCompleted] = useState(false);
+  const [toggleCompletedArray, setToggleCompletedArray] = useState<number[]>([]);
+
+  const noCompleteTodos = todos.filter(elem => !elem.completed);
+  const completeTodos = todos.filter(elem => elem.completed);
+  const isSomeComplete = todos.some(todo => todo.completed === true);
+  const allCompleted = todos.every(todo => todo.completed === true);
+
+  useEffect(() => {
+    if (inputTitle.current !== null) {
+      inputTitle.current.focus();
+    }
+  }, []);
+
+  const handlerFilterChange = (newFilter: string) => {
+    setFilter(newFilter);
+  };
+
+  const handlerChangeTitle = (event: React.ChangeEvent<HTMLInputElement>) => {
+    setTitle(event.target.value);
+  };
+
+  const handlerAddTodo = (event: React.FormEvent<HTMLFormElement>) => {
+    event.preventDefault();
+    if (title.trim() !== '') {
+      const newTask = {
+        userId: USER_ID,
+        title: title.trim(),
+        completed: false,
+      };
+
+      if (inputTitle.current !== null) {
+        inputTitle.current.disabled = true;
+      }
+
+      setTempTodo({
+        ...newTask,
+        id: 0,
+      });
+      addTodos(newTask)
+        .then(newTodo => {
+          setTitle('');
+          setTodos((prevTodos) => [...prevTodos, newTodo]);
+        })
+        .catch(() => {
+          setErrorMessage('Unable to add a todo');
+          setTempTodo(null);
+          if (errorDiv.current !== null) {
+            errorDiv.current.classList.remove('hidden');
+            setTimeout(() => {
+              if (errorDiv.current !== null) {
+                errorDiv.current.classList.add('hidden');
+                setErrorMessage('');
+              }
+            }, 3000);
+          }
+        })
+        .finally(() => {
+          if (inputTitle.current !== null) {
+            inputTitle.current.disabled = false;
+            inputTitle.current.focus();
+          }
+
+          setTempTodo(null);
+        });
+    } else {
+      setErrorMessage('Title should not be empty');
+      if (errorDiv.current !== null) {
+        errorDiv.current.classList.remove('hidden');
+        setTimeout(() => {
+          if (errorDiv.current !== null) {
+            errorDiv.current.classList.add('hidden');
+            setErrorMessage('');
+          }
+        }, 3000);
+      }
+    }
+  };
+
+  const handlerCompleteAll = () => {
+    todos.forEach((eachTodo) => {
+      if (allCompleted) {
+        setToggleCompletedArray([-1]);
+        updateTodo({ ...eachTodo, completed: false })
+          .then(() => {
+            setTodos((currentTodos: Todo[]) => currentTodos
+              .map(elem => ({ ...elem, completed: false })));
+          })
+          .catch(() => {
+            setErrorMessage('Unable to update a todo');
+            if (errorDiv.current !== null) {
+              errorDiv.current.classList.remove('hidden');
+              setTimeout(() => {
+                if (errorDiv.current !== null) {
+                  errorDiv.current.classList.add('hidden');
+                  setErrorMessage('');
+                }
+              }, 3000);
+            }
+          })
+          .finally(() => setToggleCompletedArray([]));
+      } else if (!eachTodo.completed) {
+        setToggleCompletedArray(currentIds => [...currentIds, eachTodo.id]);
+        updateTodo({ ...eachTodo, completed: true })
+          .then(() => {
+            setTodos((currentTodos: Todo[]) => currentTodos
+              .map(elem => ({ ...elem, completed: true })));
+          })
+          .catch(() => {
+            setErrorMessage('Unable to update a todo');
+            if (errorDiv.current !== null) {
+              errorDiv.current.classList.remove('hidden');
+              setTimeout(() => {
+                if (errorDiv.current !== null) {
+                  errorDiv.current.classList.add('hidden');
+                  setErrorMessage('');
+                }
+              }, 3000);
+            }
+          })
+          .finally(() => setToggleCompletedArray([]));
+      }
+    });
+    if (todos.some(todo => todo.completed === false)) {
+      const updatedTodos = todos.map((todo) => ({
+        ...todo,
+        completed: true,
+      }));
+
+      setTodos(updatedTodos);
+    } else {
+      const updatedTodos = todos.map((todo) => ({
+        ...todo,
+        completed: false,
+      }));
+
+      setTodos(updatedTodos);
+    }
+  };
+
+  const handlerClearCompletes = () => {
+    completeTodos.forEach((eachTodo) => {
+      setIsDeleteCompleted(true);
+
+      deleteTodo(eachTodo.id)
+        .then(() => {
+          setTodos((currentTodos: Todo[]) => currentTodos
+            .filter(elem => elem.id !== eachTodo.id));
+        })
+        .catch(() => {
+          setErrorMessage('Unable to delete a todo');
+          if (errorDiv.current !== null) {
+            errorDiv.current.classList.remove('hidden');
+            setTimeout(() => {
+              if (errorDiv.current !== null) {
+                errorDiv.current.classList.add('hidden');
+                setErrorMessage('');
+              }
+            }, 3000);
+          }
+        })
+        .finally(() => setIsDeleteCompleted(false));
+    });
+  };
+
+  const filteredTodos = todos.filter((todo) => {
+    if (filter === Filter.ALL) {
+      return true;
+    }
+
+    if (filter === Filter.ACTIVE) {
+      return !todo.completed;
+    }
+
+    return todo.completed;
+  });
+
+  const handlerCloseError = () => {
+    if (errorDiv.current !== null) {
+      errorDiv.current.classList.add('hidden');
+      setErrorMessage('');
+    }
+  };
+
+  return (
+    <div className="todoapp">
+      <h1 className="todoapp__title">todos</h1>
+
+      <div className="todoapp__content">
+        <header className="todoapp__header">
+          {todos.length !== 0 && (
+            <button
+              type="button"
+              className={classNames('todoapp__toggle-all', {
+                active: allCompleted,
+              })}
+              data-cy="ToggleAllButton"
+              onClick={handlerCompleteAll}
+            />
+          )}
+
+          {/* Add a todo on form submit */}
+          <form onSubmit={handlerAddTodo}>
+            <input
+              ref={inputTitle}
+              data-cy="NewTodoField"
+              type="text"
+              className="todoapp__new-todo"
+              placeholder="What needs to be done?"
+              value={title}
+              onChange={handlerChangeTitle}
+            />
+          </form>
+        </header>
+
+        {(todos.length !== 0 || tempTodo !== null) && (
+          <TodosList
+            todos={filteredTodos}
+            isDeleting={isDeleteCompleted}
+            ToggleComplete={toggleCompletedArray}
+          />
+        )}
+
+        {(todos.length !== 0 || tempTodo !== null) && (
+          <footer className="todoapp__footer" data-cy="Footer">
+            <span className="todo-count" data-cy="TodosCounter">
+              {`${noCompleteTodos.length} items left`}
+            </span>
+
+            <TodosFilter
+              currentFilter={filter}
+              onFilterChange={handlerFilterChange}
+            />
+
+            {/* don't show this button if there are no completed todos */}
+            <button
+              type="button"
+              className="todoapp__clear-completed"
+              data-cy="ClearCompletedButton"
+              disabled={!isSomeComplete}
+              onClick={handlerClearCompletes}
+            >
+              Clear completed
+            </button>
+          </footer>
+        )}
+      </div>
+
+      {/* Notification is shown in case of any error */}
+      {/* Add the 'hidden' class to hide the message smoothly */}
+      <div
+        ref={errorDiv}
+        data-cy="ErrorNotification"
+        className="hidden notification
+          is-danger is-light has-text-weight-normal"
+      >
+        <button
+          data-cy="HideErrorButton"
+          type="button"
+          className="delete"
+          onClick={handlerCloseError}
+        />
+        {/* show only one message at a time */}
+        {errorMessage}
+        {/* <br />
+        Unable to add a todo
+        <br />
+        Unable to update a todo */}
+      </div>
+
+    </div>
+
+  );
+};
diff --git a/src/TodosContext.tsx b/src/TodosContext.tsx
new file mode 100644
index 0000000000..c00633382f
--- /dev/null
+++ b/src/TodosContext.tsx
@@ -0,0 +1,72 @@
+import React, {
+  createContext, useEffect, useRef, useState,
+} from 'react';
+import { Todo } from './types/Todo';
+import { getTodos } from './api/todos';
+import { USER_ID } from './utils/userId';
+
+interface TodosContextProps {
+  children: React.ReactNode;
+}
+
+export const TodosContext = createContext<{
+  todos: Todo[];
+  setTodos: React.Dispatch<React.SetStateAction<Todo[]>>;
+  errorMessage: string,
+  setErrorMessage: React.Dispatch<React.SetStateAction<string>>;
+  errorDiv: React.RefObject<HTMLDivElement>;
+  inputTitle: React.RefObject<HTMLInputElement>;
+  tempTodo: Todo | null;
+  setTempTodo: React.Dispatch<React.SetStateAction<Todo | null>>
+}>({
+  todos: [],
+  setTodos: () => { },
+  errorMessage: '',
+  setErrorMessage: () => { },
+  errorDiv: { current: null },
+  inputTitle: { current: null },
+  tempTodo: null,
+  setTempTodo: () => { },
+});
+
+export const TodosProvider: React.FC<TodosContextProps> = ({ children }) => {
+  const [todos, setTodos] = useState<Todo[]>([]);
+  const [errorMessage, setErrorMessage] = useState('');
+  const [tempTodo, setTempTodo] = useState<Todo | null>(null);
+
+  const inputTitle = useRef<HTMLInputElement>(null);
+  const errorDiv = useRef<HTMLDivElement>(null);
+
+  useEffect(() => {
+    getTodos(USER_ID)
+      .then(setTodos)
+      .catch(() => {
+        setErrorMessage('Unable to load todos');
+        if (errorDiv.current !== null) {
+          errorDiv.current.classList.remove('hidden');
+          setTimeout(() => {
+            if (errorDiv.current !== null) {
+              errorDiv.current.classList.add('hidden');
+              setErrorMessage('');
+            }
+          }, 3000);
+        }
+      });
+  }, []);
+
+  return (
+    <TodosContext.Provider value={{
+      todos,
+      setTodos,
+      errorMessage,
+      setErrorMessage,
+      errorDiv,
+      inputTitle,
+      tempTodo,
+      setTempTodo,
+    }}
+    >
+      {children}
+    </TodosContext.Provider>
+  );
+};
diff --git a/src/api/todos.ts b/src/api/todos.ts
new file mode 100644
index 0000000000..b498d6c595
--- /dev/null
+++ b/src/api/todos.ts
@@ -0,0 +1,20 @@
+import { Todo } from '../types/Todo';
+import { client } from '../utils/fetchClient';
+
+export const getTodos = (userId: number) => {
+  return client.get<Todo[]>(`/todos?userId=${userId}`);
+};
+
+export const addTodos = ({ userId, title, completed }: Omit<Todo, 'id'>) => {
+  return client.post<Todo>('/todos', { userId, title, completed });
+};
+
+export const deleteTodo = (todoId: number) => {
+  return client.delete(`/todos/${todoId}`);
+};
+
+export const updateTodo = ({
+  id, userId, title, completed,
+}: Todo) => {
+  return client.patch(`/todos/${id}`, { userId, title, completed });
+};
diff --git a/src/components/TodoItem/TodoItem.tsx b/src/components/TodoItem/TodoItem.tsx
new file mode 100644
index 0000000000..5a20da2100
--- /dev/null
+++ b/src/components/TodoItem/TodoItem.tsx
@@ -0,0 +1,267 @@
+import classNames from 'classnames';
+import { useContext, useRef, useState } from 'react';
+
+import { Todo } from '../../types/Todo';
+import { deleteTodo, updateTodo } from '../../api/todos';
+import { TodosContext } from '../../TodosContext';
+
+type Props = {
+  todo: Todo,
+  isProcessed?: boolean,
+};
+
+export const TodoItem: React.FC<Props> = ({
+  todo,
+  isProcessed = false,
+}) => {
+  const {
+    todos,
+    setTodos,
+    setErrorMessage,
+    errorDiv,
+    inputTitle,
+  } = useContext(TodosContext);
+  const [isLoading, setIsLoading] = useState(false);
+  const [newTitle, setNewTitle] = useState('');
+  const [isEditing, setIsEditing] = useState(false);
+
+  const editInput = useRef<HTMLInputElement>(null);
+
+  const handlerCompleteTodo = () => {
+    const updatedTodos = [...todos];
+    const currentTodoIndex = updatedTodos
+      .findIndex((elem: Todo) => elem.id === todo.id);
+
+    if (currentTodoIndex !== -1) {
+      const newCompleted = !updatedTodos[currentTodoIndex].completed;
+
+      updatedTodos[currentTodoIndex] = {
+        ...updatedTodos[currentTodoIndex],
+        completed: newCompleted,
+      };
+
+      updatedTodos
+        .splice(currentTodoIndex, 1, updatedTodos[currentTodoIndex]);
+    }
+
+    setIsLoading(true);
+    updateTodo(updatedTodos[currentTodoIndex])
+      .then(() => {
+        setTodos(updatedTodos);
+      })
+      .catch(() => {
+        setErrorMessage('Unable to update a todo');
+        if (errorDiv.current !== null) {
+          errorDiv.current.classList.remove('hidden');
+          setTimeout(() => {
+            if (errorDiv.current !== null) {
+              errorDiv.current.classList.add('hidden');
+              setErrorMessage('');
+            }
+          }, 3000);
+        }
+      })
+      .finally(() => setIsLoading(false));
+  };
+
+  const handlerDeleteTodo = () => {
+    setIsLoading(true);
+    deleteTodo(todo.id)
+      .then(() => {
+        setTodos((currentTodos: Todo[]) => currentTodos
+          .filter(elem => elem.id !== todo.id));
+      })
+      .catch(() => {
+        setErrorMessage('Unable to delete a todo');
+        if (errorDiv.current !== null) {
+          errorDiv.current.classList.remove('hidden');
+          setTimeout(() => {
+            if (errorDiv.current !== null) {
+              errorDiv.current.classList.add('hidden');
+              setErrorMessage('');
+            }
+          }, 3000);
+        }
+      })
+      .finally(() => setIsLoading(false));
+  };
+
+  const handlerEditTitle = (event: React.ChangeEvent<HTMLInputElement>) => {
+    setNewTitle(event.target.value);
+  };
+
+  const handlerEndEditTodoOnBlur = () => {
+    if (isEditing) {
+      if (newTitle.trim() !== '') {
+        if (newTitle.trim() !== todo.title) {
+          const updatedTodos = [...todos];
+          const currentTodoIndex = updatedTodos
+            .findIndex((elem: Todo) => elem.id === todo.id);
+
+          if (currentTodoIndex !== -1) {
+            updatedTodos[currentTodoIndex] = {
+              ...updatedTodos[currentTodoIndex],
+              title: newTitle.trim(),
+            };
+            updatedTodos
+              .splice(currentTodoIndex, 1, updatedTodos[currentTodoIndex]);
+          }
+
+          setTodos(updatedTodos);
+          setIsLoading(true);
+          updateTodo(updatedTodos[currentTodoIndex])
+            .then(() => {
+              setIsEditing(false);
+            })
+            .catch(() => {
+              setErrorMessage('Unable to update a todo');
+              if (errorDiv.current !== null) {
+                errorDiv.current.classList.remove('hidden');
+                setTimeout(() => {
+                  if (errorDiv.current !== null) {
+                    errorDiv.current.classList.add('hidden');
+                    setErrorMessage('');
+                  }
+                }, 3000);
+              }
+
+              if (editInput.current !== null) {
+                editInput.current.focus();
+              }
+
+              setTodos(todos);
+            })
+            .finally(() => setIsLoading(false));
+        } else {
+          setIsEditing(false);
+          setNewTitle('');
+        }
+      } else {
+        handlerDeleteTodo();
+        if (inputTitle.current !== null) {
+          inputTitle.current.focus();
+        }
+
+        setIsEditing(false);
+      }
+    }
+  };
+
+  const handlerKeyUp = (event: React.KeyboardEvent<HTMLInputElement>) => {
+    if (event.key === 'Escape' && isEditing) {
+      setIsEditing(false);
+    } else if (event.key === 'Enter' && isEditing) {
+      handlerEndEditTodoOnBlur();
+    }
+  };
+
+  const handlerEditTodo = () => {
+    setNewTitle(todo.title);
+    setIsEditing(true);
+
+    setTimeout(() => {
+      if (editInput.current !== null) {
+        editInput.current.focus();
+      }
+    }, 0);
+  };
+
+  const handlerSaveEditTodo = (event: React.ChangeEvent<HTMLFormElement>) => {
+    event.preventDefault();
+  };
+
+  return (
+    <div
+      data-cy="Todo"
+      className={classNames('todo', {
+        completed: todo.completed,
+      })}
+      onDoubleClick={handlerEditTodo}
+    >
+      <label
+        className="todo__status-label"
+      >
+        <input
+          data-cy="TodoStatus"
+          type="checkbox"
+          className="todo__status"
+          checked={todo.completed}
+          onChange={handlerCompleteTodo}
+
+        />
+      </label>
+
+      {isEditing
+        ? (
+          <form
+            onSubmit={handlerSaveEditTodo}
+          >
+            <input
+              ref={editInput}
+              data-cy="TodoTitleField"
+              type="text"
+              className="todo__title-field"
+              placeholder="Empty todo will be deleted"
+              value={newTitle}
+              onChange={handlerEditTitle}
+              onBlur={handlerEndEditTodoOnBlur}
+              onKeyUp={handlerKeyUp}
+            />
+          </form>
+        ) : (
+          <>
+            <span data-cy="TodoTitle" className="todo__title">
+              {todo.title}
+            </span>
+
+            <button
+              type="button"
+              className="todo__remove"
+              data-cy="TodoDelete"
+              onClick={handlerDeleteTodo}
+            >
+              ×
+            </button>
+          </>
+        )}
+
+      <div
+        data-cy="TodoLoader"
+        className={classNames('modal overlay', {
+          'is-active': isLoading || isProcessed,
+        })}
+      >
+        <div className="modal-background has-background-white-ter" />
+        <div className="loader" />
+      </div>
+    </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 data-cy="TodoLoader" className="modal overlay">
+//           <div className="modal-background has-background-white-ter" />
+//           <div className="loader" />
+//         </div>
+//       </div >
diff --git a/src/components/TodosFilter/TodosFilter.tsx b/src/components/TodosFilter/TodosFilter.tsx
new file mode 100644
index 0000000000..099ed5ed01
--- /dev/null
+++ b/src/components/TodosFilter/TodosFilter.tsx
@@ -0,0 +1,55 @@
+import classNames from 'classnames';
+import { Filter } from '../../types/Filter';
+
+type Props = {
+  currentFilter: string,
+  onFilterChange?: (filter: string) => void
+};
+
+export const TodosFilter: React.FC<Props> = ({
+  currentFilter,
+  onFilterChange = () => { },
+}) => {
+  return (
+    <nav className="filter" data-cy="Filter">
+      <a
+        href="#/"
+        className={classNames('filter__link', {
+          selected: currentFilter === Filter.ALL,
+        })}
+        data-cy="FilterLinkAll"
+        onClick={() => {
+          onFilterChange(Filter.ALL);
+        }}
+      >
+        All
+      </a>
+
+      <a
+        href="#/active"
+        className={classNames('filter__link', {
+          selected: currentFilter === Filter.ACTIVE,
+        })}
+        data-cy="FilterLinkActive"
+        onClick={() => {
+          onFilterChange(Filter.ACTIVE);
+        }}
+      >
+        Active
+      </a>
+
+      <a
+        href="#/completed"
+        className={classNames('filter__link', {
+          selected: currentFilter === Filter.COMPLETED,
+        })}
+        data-cy="FilterLinkCompleted"
+        onClick={() => {
+          onFilterChange(Filter.COMPLETED);
+        }}
+      >
+        Completed
+      </a>
+    </nav>
+  );
+};
diff --git a/src/components/TodosList/TodosList.tsx b/src/components/TodosList/TodosList.tsx
new file mode 100644
index 0000000000..66ce6161c5
--- /dev/null
+++ b/src/components/TodosList/TodosList.tsx
@@ -0,0 +1,57 @@
+import { useContext } from 'react';
+import { CSSTransition, TransitionGroup } from 'react-transition-group';
+import { Todo } from '../../types/Todo';
+import { TodoItem } from '../TodoItem/TodoItem';
+import { TodosContext } from '../../TodosContext';
+
+type Props = {
+  todos: Todo[],
+  isDeleting: boolean,
+  ToggleComplete: number[],
+};
+
+export const TodosList: React.FC<Props> = ({
+  todos,
+  isDeleting,
+  ToggleComplete,
+}) => {
+  const { tempTodo } = useContext(TodosContext);
+
+  const isProcessed = tempTodo !== null;
+
+  return (
+    <section className="todoapp__main" data-cy="TodoList">
+      <TransitionGroup>
+        {todos.map((todo: Todo) => (
+          <CSSTransition
+            key={todo.id}
+            timeout={300}
+            classNames="item"
+          >
+            <TodoItem
+              todo={todo}
+              isProcessed={(todo.completed && isDeleting)
+              || (ToggleComplete[0] === -1)
+              || (ToggleComplete.includes(todo.id))}
+            />
+          </CSSTransition>
+        ))}
+
+        {tempTodo !== null && (
+          <CSSTransition
+            key={tempTodo.id}
+            timeout={300}
+            classNames="temp-item"
+          >
+            <TodoItem
+              todo={tempTodo}
+              isProcessed={isProcessed}
+            />
+          </CSSTransition>
+        )}
+
+      </TransitionGroup>
+
+    </section>
+  );
+};
diff --git a/src/types/Filter.ts b/src/types/Filter.ts
new file mode 100644
index 0000000000..4730e848c9
--- /dev/null
+++ b/src/types/Filter.ts
@@ -0,0 +1,5 @@
+export const Filter = {
+  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/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'),
+};
diff --git a/src/utils/userId.ts b/src/utils/userId.ts
new file mode 100644
index 0000000000..65e825b8cb
--- /dev/null
+++ b/src/utils/userId.ts
@@ -0,0 +1 @@
+export const USER_ID = 11625;