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Node.js applications are those that are created on the Node.js platform, which is an event-driven I/O server-side JavaScript environment based on Google Chrome's V8 engine. Since both the server-side and client-side are written in JavaScript, Node.js allows for easier and faster code implementation, as well as processing requests quickly and simultaneously. This is especially useful for developing real-time applications, such as chat and streaming.

Bugsnag is a stability error monitoring solution which captures unhandled exceptions, diagnostic data, and version information in browser, mobile and server-side applications via open source SDKs for 50+ software platforms. By default, Bugsnag libraries capture all crashes (handled exceptions are optional), version numbers, and session information to help engineering teams proactively surface issues and save time fixing bugs.

Site24x7 is one of the oldest website monitoring services, having been in operation since 2006. They are now owned by Zoho. They provide website monitoring, server monitoring, and application monitoring. Clients include Groupon, Getty Images, Xerox, and Harley-Davidson.