"errorMessage": "Handler 'lambda_handler' missing on module 'lambda_function'"

Question

I created a simple code in AWS Lambda for listing my buckets

import boto3
import botocore

s3 = boto3.client('s3')
response = s3.list_buckets()
print('Existing buckets:')
for bucket in response['Buckets']:
    print(f'  {bucket["Name"]}')

When I Deploy and test it, it gives me the right logs (my list of buckets) but it also gives me the error

Handler 'lambda_handler' missing on module 'lambda_function'

Do i have to write lambda_function(event,context) for everything?

Yes, you have to. Because that way AWS knows which function to run. — luk2302
– luk2302, Commented Sep 14, 2021 at 16:20
@luk2302 and where do i have to put it for it to be correct? — Hamilton
– Hamilton, Commented Sep 14, 2021 at 16:21

luk2302 · Accepted Answer · 2021-09-14 16:24:10Z

2

Yes, you need it. It should be

import boto3
import botocore

def lambda_handler(event,context):
    s3 = boto3.client('s3')
    response = s3.list_buckets()
    print('Existing buckets:')
    for bucket in response['Buckets']:
        print(f'  {bucket["Name"]}')

because AWS needs to know / have a function to invoke and pass its event and context parameters.

edited Sep 14, 2021 at 16:24

answered Sep 14, 2021 at 16:22

luk2302

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3 Comments

Hamilton Over a year ago

when i put it there, it gives me the error "errorMessage": "Syntax error in module 'lambda_function'", do you know what can it be?

luk2302 Over a year ago

@Hamilton sorry, blindly copied your code which was missing an indentation. Should work now.

Hamilton Over a year ago

tysm! it worked now, you saved my day haha

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