Bottle vs ExpressJS: What are the differences?

# Introduction
When choosing a web framework for your project, it's important to understand the key differences between Bottle and ExpressJS. Both Bottle and ExpressJS are popular web frameworks used for building web applications, but they have their own unique features and characteristics.

1. **Routing**: Bottle uses a simple routing mechanism based on URL pattern matching, whereas ExpressJS provides more advanced routing capabilities with support for dynamic route parameters, route handlers, and middleware functions.
2. **Template Engines**: ExpressJS supports a variety of template engines such as Pug, EJS, and Handlebars, giving developers the flexibility to choose the one that best suits their needs. On the other hand, Bottle comes with a built-in template engine that is lightweight and easy to use.
3. **Middleware**: ExpressJS has a robust middleware system that allows developers to add custom logic in the request-response cycle, enhancing the functionality of the application. In contrast, Bottle has a simpler middleware mechanism with fewer built-in middleware options.
4. **Error Handling**: ExpressJS provides comprehensive error handling mechanisms, including error middleware and built-in error classes, making it easier to handle and manage errors in the application. Bottle, on the other hand, has a simpler error handling approach with fewer built-in error handling features.
5. **Community and Ecosystem**: ExpressJS has a larger community and ecosystem with a wide range of third-party modules and plugins available, providing extensive support and resources for developers. Bottle, although less popular, also has an active community and a growing ecosystem of plugins and extensions.
6. **Scalability**: ExpressJS is known for its scalability and performance, making it suitable for larger and more complex applications that require high levels of concurrency and throughput. Bottle, while lightweight and fast, may not be as well-suited for handling large-scale applications with heavy traffic and complex requirements.

In Summary, understanding the key differences between Bottle and ExpressJS in terms of routing, template engines, middleware, error handling, community support, and scalability is essential when choosing a web framework for your project.