Comment is a bit of an aside, but it's a shame what happened to JSONFormatter.org. The UI was preferable to alternatives for me, it ranked highly in Google so I could just search "JSON formatter" and access it, etc.

Now the site freezes 50% of the time when loading it on my Mac and when it doesn't freeze, there's a 5 second period of waiting before I can paste any input. Not to mention ads taking up 40% of the screen. The classic tech cycle of life.