React with Spring Boot and Grails

Architecture

React UI, component, custom hook, API service, REST API, Spring Boot or Grails, database.

API Layer

Centralize base URL, auth headers, 401 refresh, retries and typed responses in services/api.js.

Backend Contracts

Paginate with page, size, sort and q; upload with FormData multipart; allowlist CORS origins.

Key Points

• Components stay dumb; services own HTTP.
• Agree pagination shape once.
• Grails respond and Spring ResponseEntity both fit.