How to Check if a Tag Exists in Logstash?

Better Stack Team
Updated on April 2, 2024

To determine whether a tag exists within Logstash, you can use conditional statements. Here's how you can do that:

if "your_tag" in [tags] {
  # Perform actions when the tag "your_tag" exists

This statement checks if the tag your_tag exists in the [tags] field of Logstash events. If it is present, the condition evaluates to true, and the corresponding actions are executed.

If you also want to handle scenarios where the tag does not exist, you can use an if/else statement:

if "your_tag" in [tags] {
  # Perform actions when the tag "your_tag" exists
} else {
  # Perform actions when the tag "your_tag" does not exist

This construct allows you to perform different actions based on whether the specified tag exists in Logstash events.

Got an article suggestion? Let us know
Explore more
Licensed under CC-BY-NC-SA

This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.

Make your mark

Join the writer's program

Are you a developer and love writing and sharing your knowledge with the world? Join our guest writing program and get paid for writing amazing technical guides. We'll get them to the right readers that will appreciate them.

Write for us
Writer of the month
Marin Bezhanov
Marin is a software engineer and architect with a broad range of experience working...
Build on top of Better Stack

Write a script, app or project on top of Better Stack and share it with the world. Make a public repository and share it with us at our email.

or submit a pull request and help us build better products for everyone.

See the full list of amazing projects on github