Online Parking Reservation system provides a smarter way for customer to select parking location, parking duration, extend parking duration. It also provides parking reservation for various types of vehicles under one parking portal. This project is to ease the process of parking through the web application. In this we mainly concentrate on parking slots in the building and the user is able to book the slot before entering into the building. Backend Technologies: - Framework is Spring Boot, ORM Tool Hibernate, Database MySQL, Build Tool is Maven ,Language is Java Frontend Technologies: - Framework is ReactJs, Language is HTML, CSS, Javascript.