A java-based Text User Interface library:

GitHub

GitHub - mabe02/lanterna: Java library for creating text-based GUIs

Java library for creating text-based GUIs. Contribute to mabe02/lanterna development by creating an account on GitHub.

Are there any online tools to validate NOSTR events in JSON format to know if they are valid?

You don't need to be the brightest, and likely everything you've done was done better by someone else better. Instead, be persistent. Devote your time and energy to get something done and keep improving because you genuinely enjoy doing it. That is what Nostr is all about.

ChatGPT is fantastic. Was able to produce an algorithm in raw form without using any third-party libraries. As an amplification tool for every day development, it is quite some help.