Capturing Lambda Logs In JSON Format

Reference: https://aws.amazon.com/blogs/compute/introducing-advanced-logging-controls-for-aws-lambda-functions/

Recently AWS announced native support for capturing Lambda logs in JSON format. So let’s see how that works.

Step 1: Create a Python 3.10 Lambda function with following code:

import json
import logging


logger = logging.getLogger()

def lambda_handler(event, context):
    logger.info("The API call ended successfully")
    logger.error("The API call did not end successfully")
    return {
        'statusCode': 200,
        'body': json.dumps('Hello from Lambda!')
    }

Step 2: Go to Lambda configuration->Monitoring and operations tools and click on Edit

and set Application log level to INFO and System log level to WARN.

Step 3: Now execute the lambda function and check the logs in CloudWatch

If you change the log format back to text, you’ll see CloudWatch logs like this