When using the "Tellraw" and "Title" commands, you'll always get a "Invalid json: malformed JSON at line 1 column x" error.

Tested using server console, in-game player chatbox, and command blocks.

Tested using the following commands:
/title @a title

{text:"Test"}

/title @a title "test"
/title @a title test

/tellraw @a

{text:"Test"}

/tellraw @a "Test"
/tellraw @a test

As well as the preview title commands on the "commands" page at the minecraft wiki
"title @a subtitle

{text:"The story begins…", color:gray, italic:true}

"