Next.js Client + Express Backend
Frontend: :3000
↔
Backend: :4000
GET
/api/books
1. Fetch All
Send Request
GET
?query=...
2. Search
Go
POST
/api/books
3. Create (Triggers CORS)
Create Book
Books List
Clear
List is empty.
Use "Fetch All" to load data.
Selected Resource
Select a book from the middle column to view details and edit options.