JSON Doesn't work in Minecraft 1.9

I updated to 1.9 and was exciting to add some cool new items to my Redstone world when I realized that that everything including JSON didn't work, I tried some different things like

{text:"Hello"}

,

{Text:"Hello"}

, and

{text:Hello}

but nothing worked all it said was either "[17:42:40] Invalid json: malformed JSON at line 1 column 3" or "[17:55:28] Invalid json: ". Please fix this I love to use JSON with /tellraw, /title, /blockdata with signs, and /give with books and signs. I'll try to put up some screenshots. Thank you for reading this!