Lambda calling Lambda - how to access the payload in the second?

Question

I'm calling a Lambda from another Lambda asynchronously using:

payload = {"id":item['id']}
invoke_lambda = lambda_client.invoke(FunctionName="process",
                                     InvocationType="Event",
                                     Payload=json.dumps(payload)) # Use InvocationType="RequestResponse" for synchronous run

This is likely rather obvious, but I can't find the documentation for it - how do I access the payload in the second lambda defined as:

def process(event, context):
    (...)

bwest · Accepted Answer · 2019-03-29 19:35:13Z

0

Your payload should be in the body of the event dict. Try json.loads(event['body']).get('id').

edited Mar 29, 2019 at 19:35

answered Mar 29, 2019 at 19:29

bwest

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Jonas · Accepted Answer · 2024-09-11 13:51:46Z

0

Neither of the suggested solutions worked for me in 2024, but

id = event['id']

did.

answered Sep 11, 2024 at 13:51

Jonas

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Filipe Aleixo · Accepted Answer · 2019-03-30 23:35:24Z

-1

On the second lambda, you just need to do id = context['id']. When it's an asynchronous call, event doesn't come with the body key.

answered Mar 30, 2019 at 23:35

Filipe Aleixo

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2 Comments

Chris Ivan Over a year ago

It would benefit any readers if you clarified the differences between reading from event and reading from context, and in what situations they should be accessed.

James Huang Over a year ago

I got this error message "errorMessage": "'LambdaContext' object is not subscriptable" if I used context to retrieve payload.

Nick Walsh · Accepted Answer · 2019-03-29 17:29:07Z

-2

Possible duplicate question -- Nodejs - Invoke an AWS.Lambda function from within another lambda function

Note, you may want to take a look at Step Functions to prevent Lambda A from incurring costs as it waits for Lambda B to complete.

answered Mar 29, 2019 at 17:29

Nick Walsh

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1 Comment

Filipe Aleixo Over a year ago

Thanks for the suggestion, but I'm doing it in Python - not nodejs

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