It replaced JSONLint for me
I used to visit JSONLint (the website) very frequently. I liked its simplicity, its auto-formatting, and its speed. Then, I gave Blinged JSON Validator a try. I love that it is an actual app that I can launch even faster than I would load JSONLint.
The 1st big plus of Blinged is that it shows me inline in my JSON where the error is when I try to validate. There are still a few things that I would tweak in the app, but that leads me to the 2nd big plus: Blinged JSON Validator has great support! I emailed Natalie (the engineer) directly; she got back to me and addressed all my points.
Give it a try! Oh, and enjoyed the blings when it validates.
gduverger about Blinged JSON Validator