How can i put event json in an array

[sky (blue)]

Hi,all！
I need logstash to output the event json in array, example,
{"field":"value"} to [{"field":"value"}] , how can i do?

thanks!

[Badger]

If you have a message that contains {"field":"value"} then you can put it into an array using

mutate { merge => { "somearray" => "message" } }