This is the Java backend implementation of the Library App.
It is a Spring Boot REST API that connects to MongoDB and exposes routes for managing books, users, and library operations.

• Java 21
• Spring Boot 3.4.5
  • Spring Web (REST API)
  • Spring Data MongoDB (database access)
  • Spring Security (basic security and JWT support)
• MongoDB Atlas / Local MongoDB
• Maven (build and dependency management)

git clone https://github.com/mongodb-developer/library-management-system.git
cd library-management-system/java-server

The app requires a MongoDB connection string. On Linux / macOS

export MONGODB_URI="<YOUR_CONNECTION_STRING>"

On Windows

$env:MONGODB_URI="<YOUR_CONNECTION_STRING>"

mvn spring-boot:run

The application will start on port 8080 by default:

http://localhost:8080