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75+ curated questions with the same answer shape every time: quick recap, deep dive, pitfalls, and follow-ups. Coverage includes api error handling patterns, comparisons, cors and preflight, fetch vs axios, and more.
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Topics follow a teaching order. Each answer ends with a clear Next question control so you can move forward without hunting the list.
A fullstack developer must be able to connect a React frontend to a Spring Boot backend without being blocked by CORS errors, serialisation mismatches, or unhandled error states. This module covers the HTTP contract (what fetch() is actually sending, what the server is sending back), CORS preflight and how to configure Spring Boot's @CrossOrigin or WebMvcConfigurer, the JSON ↔ Java object mapping rules (Jackson), and the frontend patterns for showing loading spinners, retry buttons, and user-friendly error messages. The integrative perspective — trace a user action from button click to database write and back — is what distinguishes a fullstack developer from two separate specialists.
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Topics are ordered for learning. Within each topic, rows are numbered 1–75 globally so you always know where you are. Collapse topics if you want a lighter view — use Expand all when you need the full list again.
Numbers 1–75 follow the order we recommend — click any row to open the full answer, or use the sticky Next link at the bottom of each page to go Q1 → Q75.