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57+ curated questions with the same answer shape every time: quick recap, deep dive, pitfalls, and follow-ups. Coverage includes comparisons, jwt storage localstorage vs cookie, login logout flow end to end, protecting routes frontend, and more.
Suggested path
Topics follow a teaching order. Each answer ends with a clear Next question control so you can move forward without hunting the list.
Authentication is the fullstack integration topic freshers get quizzed on most. Interviewers want to know whether you understand the complete flow — user submits login form → Spring Boot validates credentials → issues JWT → React stores the token → React sends the token on every subsequent request → Spring Security validates it. This module traces that journey end to end, covers the JWT storage trade-off (localStorage is vulnerable to XSS; HttpOnly cookies are safer but need CSRF protection), how to protect React routes for logged-in users, and the refresh token pattern that keeps sessions alive without storing long-lived secrets.
Full catalog
Topics are ordered for learning. Within each topic, rows are numbered 1–57 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 1–57 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 → Q57.