I had five rounds of interview online where initially we were asked to design a project assigned by them after selection, and then further rounds consisted of technical questions such as DSA and regarding web technologies. Only the selected few people were qualified for further rounds after passing each round.

How would you design a RESTful API using Node.js and Express to handle CRUD operations for a blog post? Please explain the structure of the routes and how you would handle requests and responses, including error handling.