Contacts API (Spring Boot)

A RESTful API for managing contacts using Spring Boot, Spring Data JPA, and H2 database.

Features

• Create, read, update, delete (CRUD) operations for contacts
• Contact fields: UUID, name, phoneNumber, email, tags
• H2 in-memory database (with file-based option for persistence)
• RESTful endpoints with clear response structure
• Postman-ready

Technologies Used

• Java 21
• Spring Boot 3
• Spring Data JPA
• H2 Database (dev)
• Maven

Endpoints

Method	Endpoint	Description
GET	/contacts	Get all contacts
GET	/contacts/{id}	Get a contact by ID
POST	/contacts	Create a new contact
PUT	/contacts/{id}	Update a contact
DELETE	/contacts/{id}	Delete a contact by ID

Run Locally

1. Clone the repo:

git clone https://github.com/your-username/java-spring-contacts-api.git
cd java-spring-contacts-api

2. Build and run with IntelliJ or:

mvn clean install
mvn spring-boot:run

3. Visit:

http://localhost:8080/contacts

H2 Database Console

• URL: http://localhost:8080/h2-console
• JDBC: jdbc:h2:file:./data/contactsdb
• Username: sa
• Password: (leave blank)