Parsing nested JSON fields to separate fields

Hello everyone!

I need to create a Logstash configuration that allows me to parse nested JSON fields to single fields.

Input event looks like this:

	"cloud": {
		"instance": {
			"id": "XXXX"
		"machine": {
			"type": "t3a.large"
		"provider": "aws",
		"availability_zone": "eu-central-1a",
		"region": "eu-central-1",
		"account": {
			"id": "XXXX"
		"image": {
			"id": "XXXX"

And the output I would like to have is to have every nested value parsed to fields along with parent field names included in the final field name like so:

"cloud_instance_id" => "XXX"
"cloud_machine_type" => "XXX"

I have tried with just using the add_field filter and creating a new field using the value like so:

mutate {
  add_field => {
    "cloud_account_id" => "%{[cloud][account][id]}"

But I'm looking to find out if there is a way to do this by using the Ruby filter and creating a reusable script with input parameters.

Any help is appreciated!

See this answer.

1 Like

Thank you! Case closed.

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