Minecraft Titles

I put in this command:

/title @a title {"text":"YOUR NOSE IS A LITTLE BUTTON",color:"dark_green",bold:true}

I Got this error

[17:42:21] Invalid json: malformed JSON at line 1 column 41

Also, will the title only play when this command is activated?:

/title @a times 60 100 60

All keys and strings in strict JSON must have quotation marks around them, except for false and true, which are considered booleans:

/title @a title {"text":"YOUR NOSE IS A LITTLE BUTTON","color":"dark_green","bold":true}

The /title @a title command is what plays the title, /title @a times will adjust the timing options for future titles, but not play the title itself.