Node.js is an open source JavaScript runtime built on Chrome's V8 JavaScript engine. It uses an event-driven, non-blocking I/O model that makes it lightweight and efficient for data-intensive real-time applications that run across distributed devices. Some key uses of Node.js include building mobile apps, real-time applications like chat rooms, and IOT applications due to its asynchronous nature and ability to handle high volumes of simultaneous connections with low latency.

1. Intro to Node.js

2. Agenda
● What is Node.js
● Why Node.js
● Node.js Internals
● Comparisons
● When to use Node.js
● Who use Node.js
● Future of Node.js

3. ● What is Node.js
● What is Node.js
● Open source JavaScript runtime
● Uses event-driven, non-blocking I/O model
● Built on top of V8
● Created by Ryan Dahl in 2009

4. ● Why Node.js
● What is Node.js
● V8 engine is highly optimized for performance.
● Events are lightweight, while threads are
heavyweight.
● Cuts down costs (Developments, H/Ws)
● Awesome package manager (NPM)
● Huge community
● Versatility

5. ● Node.js Internal
● What is Node.js
Call
Stack
Thread
Pool
Task Queue

6. How Node.js executes:

7. ● What is Node.js

8. Comparison with Django

9. Where to use Node.js
● What is Node.js
● Best for I/O bound applications
● Mobile apps that talk to platform APIs and DB
● RTAs like Chat rooms/bots, Browser games,
Data streaming apps and IOT etc.

10. Where NOT
to use Node.js
● What is Node.js
● For CPU bound applications
● Doesn’t use multi core
● Securities

11. ● What is Node.js

12. Paypal says
● What is Node.js
1. Built almost twice as fast
2. 33% fewer lines of code
3. 40% fewer files
4. Doubled requests served per second
5. Decreased response time by 35%

13. A secure runtime for JavaScript
and TypeScript built on V8

14. References
● https://nodejs.org/
● https://insights.stackoverflow.com/survey/2019#technology
● http://docs.libuv.org
● https://2014.jsconf.eu/speakers/philip-roberts-what-the-heck-is-the-event-loop-anyway.html
●

15. Q/A?
Shoot some questions!

16. Thank You!