How to customize the json-format of handlers in keycloak #39674

LS-100 · 2025-05-13T10:00:59Z

LS-100
May 13, 2025

I am using console handler for logging

log_console_output: json
log_console_json_format: ecs

For my application I want a logging output as json like

{
  "timestamp":"2020-03-03T03:03:03.003Z",
  "level":"INFO",
  "message":"Descriptive message text",
  "eventId":"SYS00001",
  ...
}

We can create the above format using log_console_json_format but I want this output as json. Is there any way to customize the ecs json format like above so that I can change the order, renaming the parameter for eg: "event.sequence" to "eventId" and add/remove parameters as per the requirement?

shawkins · 2025-05-16T18:41:31Z

shawkins
May 16, 2025
Collaborator

I'm not sure how much flexibility is allowed in the ecs formatting, because it is effectively piggybacking on the existing mechanisms to manipultate JSON output. You could try the default format instead, and add in your own quarkus.log.console.json properties - see things like https://quarkus.io/guides/logging#quarkus-logging-json_quarkus-log-console-json-key-overrides - that takes a String, which is a map of built-in keys mapped to your preferred key, so you'd map sequence to eventId rather than event.sequence.

There are several issues open along the lines of customizing ecs output. See also an issue / discussion around supporting a nested format: quarkusio/quarkus#47371

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How to customize the json-format of handlers in keycloak #39674

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LS-100 May 13, 2025

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shawkins May 16, 2025 Collaborator

LS-100
May 13, 2025

shawkins
May 16, 2025
Collaborator