Node.js Single Quotes

You can think of Mountebank as a small software appliance that is programmable via HTTP. The fact that it happens to be written in NodeJS is completely opaque to any calling service. When it launches, you send it commands telling it what port to stub on, what protocol to handle (currently TCP, HTTP, and HTTPS are supported, with more planned), and what responses it should send when requests are sent. It also supports setting expectations if you want to use it as a mock. You can add or remove these stub endpoints at will, making it possible for a single Mountebank instance to stub more than one downstream dependency.

The framework is also single-threaded, and its model relies on concurrency which is based on an event loop. It operates in a non-blocking mode, which means that the programs are not blocked but allowed  to continue with execution. What happens is that it registers the callback, and then allows the program to continue with the process of execution. Due to the ability of the framework to handle concurrent operations effectively without having multiple threads in the state of execution, the applications are always in a position to scale well.