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Within my lambda function, which takes in event api query strings, I want to check if one is present. The below works if it is:

if event['queryStringParameters']['order'] == 'desc':

        file_names.append('hello')

I have tried event['queryStringParameters']['order'] != null but if there is no order query string used the lambda function the function breaks causing a 502 response. How do I check if a query string is not used without it breaking?

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Check if the dict has a key before referencing it.

if 'queryStringParameters' in event and 'order' in event['queryStringParameters']:

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