Question 102364 in Amazon Web Sevices Question posted in
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Amazon web services – How can I output START, END and REPORT Lambda output as JSON?

I want the log produced by the java runtime in an AWS lambda function to be in JSON format.

I’m talking about logs like these:

2022-07-27T19:30:21.094+03:00   START RequestId: 09e6e95c-5b1f-53c0-8483-b207312166be Version: $LATEST
2022-07-27T19:30:37.640+03:00   SLF4J: Class path contains multiple SLF4J bindings.
2022-07-27T19:31:03.536+03:00   END RequestId: 09e6e95c-5b1f-53c0-8483-b207312166be
2022-07-27T19:31:03.536+03:00   REPORT RequestId: 09e6e95c-5b1f-53c0-8483-b207312166be Duration: 42441.58 ms Billed Duration: 42442 ms Memory Size: 512 MB Max Memory Used: 226 MB
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2

Answers


  1. 0

    You cannot alter the format of the START, END, or REPORT log lines. These are produced by the Lambda service.

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  2. 0

    In AWS Lambda, when you write a Java Lambda function, you have two options for logging.

    Add log4j2 propety in your lambda class path

    log4j2.properties file to use the JSON Template Layout:

           log4j.appender.stdout=org.apache.log4j.ConsoleAppender
       log4j.appender.stdout.encoding=UTF-8
       log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
       log4j.appender.stdout.layout.ConversionPattern={"debug_level":"%p","debug_timestamp":"%d{ISO8601}","debug_thread":"%t","debug_file":"%F", "debug_line":"%L","debug_message":"%m"}%n

    enter image description here

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