Design patterns were created to standardize solutions to the most common problems encountered by developers in applications of all types. They provide proven and transparent approaches to many important issues in projects. Using them dramatically reduces the number of errors that can occur during application development and makes code easier to read by other colleagues, making work more enjoyable and faster. Most patterns are available regardless of the language, it is only important that the paradigm is appropriate. There will also be unique ones, the use of which is limited to the application layer (frontend and backend), or the framework used in the project. In this article I will introduce examples of patterns used in applications made in the React library.