"Top Express.js Questions Every Developer Should Know" is your go-to mini guide for mastering Express.js interviews in 2025. Tailored for backend and full-stack developers, this snapshot covers the most asked interview questions — from routing, middleware, and RESTful APIs to error handling and performance optimization. Whether you're a fresher stepping into Node.js or an experienced developer brushing up on Express fundamentals, these questions provide a fast and effective way to prepare. Each question includes clear, concise answers that align with real-world development practices and interviewer expectations. Perfect for last-minute revision or pre-interview warm-ups, this compact guide ensures you stay confident and technically sharp during your Express.js interviews.