Spring Boot REST API: Fast Track for Beginners & Busy Devs

Add the RESTController annotation at the top of the UserController class so it can handle incoming HTTP requests.

Define the request mapping annotation below the REST controller to route user-related requests with a base path, so all endpoints start with /users.

Learn how to read a user id from the URL path using a path variable in a Spring Boot REST controller method. Test with Postman to retrieve a single user.

Learn how to read query parameters from the url, implement pagination to avoid returning all users at once, using page and limit parameters such as ?page=2&limit=10.

Learn how to read query parameters in a spring boot rest controller, return a collection of users, and test filtering with postman.

Make parameters optional by setting default values in the user controller, then verify default pagination (page 1, limit 10); highlight the use of query parameters for pagination, filtering, and sorting.

Modify the getUser method to return data from a map, checking the map exists and contains the user ID, returning the user when present and no content otherwise.

Test the flow by rerunning the application, creating a new user in Postman to obtain an id, then retrieve the stored user details from in-memory storage that resets on restart.

Prepare data to update by reusing existing post request data, copy it, and set the post body to update only the name, the first name, and the last name.

Learn to handle put requests in a spring boot rest api by updating the user endpoint to receive id from the path and body, reusing the post approach with validation.

Create a user update dto named UserUpdateRequest, learn to separate dtos for clarity, define two feeds, add getters and setters, and import the dto into the method.