What are the differences between popular backend libraries?

What are the differences between Express.js and Koa.js?

Express.js is a minimal and flexible Node.js web application framework, while Koa.js is designed to be a smaller, more expressive, and more robust foundation for web applications and APIs.

Which one is better for building RESTful APIs?

Express.js is often preferred for RESTful APIs due to its simplicity and large ecosystem, but Koa.js offers better control over middleware.

Can you compare Django and Flask for Python?

Django is a high-level framework that follows the 'batteries-included' philosophy, while Flask is a micro-framework that is lightweight and flexible.

What about Ruby on Rails vs Sinatra?

Ruby on Rails is a full-featured framework that emphasizes convention over configuration, whereas Sinatra is a DSL for quickly creating web applications in Ruby.