This simple validation test tells you if you have JSON or not. Simply copy-paste in the textfield and hit the 'Validate JSON' button. If you have JSON, the border of the textfield turns into green and a 'Valid JSON!' text blinks at the bottom of the textfield. If you don't have valid JSON, the border turns red and it will let you know that you do not have valid JSON. 'Clear textarea' to test some more... Done with jQuery with the parse()-method and flexbox and keyframes in CSS.
Go to 'JSON validator' project