Spring Boot MongoDB CRUD REST API Example

In this tutorial, we will build a Spring Boot CRUD (Create, Read, Update, Delete) REST API application using MongoDB.

We will manage a Todo entity with fields: id, title, description, status, and createDate. We will use Java record for the DTO and follow best practices by keeping the conversion logic in the service layer.

We will develop CRUD RESTful web services for creating, reading, updating, and deleting todos.

Spring Boot Three-Layer Architecture

+-----------+      +-----------------+
|           |      | Controller Layer|
|  Postman  +----->+ (Handles HTTP   |
| (Client)  |      |  requests and   |
+-----------+      |  responses)     |
                   +--------+--------+
                            |
                            v
                   +--------+--------+
                   | Service Layer   |
                   | (Implements     |
                   |  business logic |
                   |  and data       |
                   |  transformations)|
                   +--------+--------+
                            |
                            v
                   +--------+--------+
                   | Repository Layer|
                   | (Manages data   |
                   |  operations with|
                   |  MongoDB)       |
                   +--------+--------+
                            |
                            v
                   +--------+--------+
                   |   MongoDB       |…