Internal Server Error from AWS lambda in python when returning empty body

Question

I am getting a 500 Internal Server Error with the following code in an AWS Lambda function and I cannot figure out why. The python code runs fine locally without any exceptions.

def lambda_handler (event, context):
    return {
        "statusCode": 200,
        'headers': {
            'Access-Control-Allow-Headers': 'Content-Type',
            'Access-Control-Allow-Origin': '*',
            'Access-Control-Allow-Methods': 'OPTIONS,POST,GET'
        },
        "body": [],
    }

MarcusOtter · Accepted Answer · 2021-12-18 23:34:51Z

2

The problem is that body MUST BE A STRING. Objects will not work.

The (very simple) solution that took me an hour or so to figure out:

def lambda_handler (event, context):
    return {
        "statusCode": 200,
        'headers': {
            'Access-Control-Allow-Headers': 'Content-Type',
            'Access-Control-Allow-Origin': '*',
            'Access-Control-Allow-Methods': 'OPTIONS,POST,GET'
        },
        "body": "[]",
    }

answered Dec 18, 2021 at 23:34

MarcusOtter

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