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Node.js, the JavaScript runtime environment is very popular among Full Stack Developers for building Web applications. It gives the developer to write server-side code in JavaScript and able to manage both client and server side. Node.js ensures outstanding performance, it applies event-driven, non-blocking input output and asynchronous paradigm. The study is based on benefits and challenges of using Node.js. The results of study are from comparing different web development programming languages with JavaScript which is used in Node.js. And in the end some suggestions on how to improve those areas and make it more feasible.

Cloud computing has almost changed the way of obtaining resources and managing platform as a service. With these improvements, challenges like scalability testing, performance testing is emerging very fast. This paper focuses on the evaluation of scalability of PaaS as well along with that propose a graphical model where SIS (Scalability Improvement System)is proposed in which cache are implemented at the both interfaces of PaaS to enhance the scalability in terms of providing service to the user.

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