Rails API mode là gì? Khác gì so với full Rails app?

Rails API mode (rails new my-api --api) tạo app gọn hơn — bỏ các middleware và module dành riêng cho browser-based apps.

Khác biệt chính:

# app/controllers/application_controller.rb (API mode)
class ApplicationController < ActionController::API
end

Dùng API mode khi xây dựng backend cho SPA (React/Vue) hoặc mobile app. Authentication thường dùng JWT qua Authorization: Bearer ... header thay vì cookie session.

Nếu sau cần thêm views (e.g. admin panel), có thể include lại specific modules của ActionController::Base.

Rails API mode (rails new my-api --api) creates a leaner app — it strips middleware and modules only needed for browser-based apps.

Key differences:

# app/controllers/application_controller.rb (API mode)
class ApplicationController < ActionController::API
end

Use API mode when building a backend for a SPA (React/Vue) or mobile app. Authentication typically uses JWT via Authorization: Bearer ... header instead of cookie sessions.

If you later need views (e.g. an admin panel), you can re-include specific ActionController::Base modules.