Accessing data POST'd to a python AWS Lambda Function URL

Question

I'm attempting to invoke an AWS Lambda Function URL in Python. Using their example lambda code as follows the value for action is always returning null. How do I access the value in the json data I POST to the Function URL?

Lambda Code (taken from here):

import logging

logger = logging.getLogger()
logger.setLevel(logging.INFO)


def lambda_handler(event, context):
    result = None
    action = event.get('action')
    if action == 'increment':
        result = event.get('number', 0) + 1
        logger.info('Calculated result of %s', result)
    else:
        logger.error("%s is not a valid action.", action)

    response = {'result': result}
    return response

Invoking using a Function URL

curl -X POST 'https://[redacted].lambda-url.eu-west-1.on.aws/' -d '{"action":"increment","number": 3}'

Result:

{"result":null}

Problem:

How do I reference the value of 'action' correctly to produce the result?

Answer 1

Out of interest, this is how I adapted the AWS sample code to parse the required fields

import logging
import json

logger = logging.getLogger()
logger.setLevel(logging.INFO)


def lambda_handler(event, context):
    message = json.loads(event['body'])
    result = None
    action = message['action']
    if action == 'increment':
        result = message['number'] + 1
        logger.info('Calculated result of %s', result)
    else:
        logger.error("%s is not a valid action.", action)

    response = {'result': result}
    return response