Java: How to log raw JSON as JSON and avoid escaping during logging with logback / slf4j

If you have a Json formatted messages, the upper solutions work, but are not so nice, since you don´t want to call a logstash specific code, each time you use your logger in the code.

Just adding a

net.logstash.logback.encoder.LogstashEncoder

is not enough, since the message itsself stays escaped. To solve this, try the following in your logback.xml:

<encoder class="net.logstash.logback.encoder.LoggingEventCompositeJsonEncoder">     <providers>        <timestamp/>        <version/>        <loggerName/>        <pattern>            <pattern>                {                "jsonMessage": "#asJson{%message}"                }            </pattern>        </pattern>    </providers></encoder>

The #asJson pattern will unescape your message.

Use the RawJsonAppendingMarker:

log.trace(net.logstash.logback.marker.Markers.appendRaw("jsonMessage", jsonString), null);

I ran into the same problem. I solved it with

<encoder class="net.logstash.logback.encoder.LogstashEncoder">          </encoder

instead of

<encoder class="net.logstash.logback.encoder.LoggingEventCompositeJsonEncoder">

In my java code I used:

SRV_PERF_LOGGER.info(net.logstash.logback.marker.Markers.appendRaw("message", jackson.writeValueAsString(dto)), null);