Getting query string parameters from API Gateway

Question

I am using Amazon API Gateway to invoke a lambda function. I am testing a get request with the following as my query string earlyDate="12-01-21"&laterDate="12-03-21".

I currently have my lambda function returning the event that gets passed:

def lambda_handler(event, context):
    return {
        "statusCode": 200,
        "body": json.dumps(event)
    }

This works as expected. When I test my API gateway I get a response which includes

"queryStringParameters": {
    "earlyDate": "12-01-21",
    "laterDate": "12-03-21"
  },
  "multiValueQueryStringParameters": {
    "earlyDate": [
      "12-01-21"
    ],
    "laterDate": [
      "12-03-21"
    ]
  },

This indicates I should be able to access these query parameters at event.queryStringParameters. However when I change my lambda function to return those:

def lambda_handler(event, context):
    return {
        "statusCode": 200,
        "body": json.dumps(event.queryStringParameters)
    }

The result is a 502 error.

How do I access the query string parameters passed in from my API Gateway?

Balu Vyamajala · Accepted Answer · 2021-02-22 01:43:31Z

2

I think, event is a dict and we can access its query params as event['queryStringParameters']

We can confirm that by

for key, value in event.items():
   print(key, value)

Lambda could return this:

return {
    'statusCode': 200,
    'body': json.dumps(event['queryStringParameters'])
}

edited Feb 22, 2021 at 1:43

answered Feb 21, 2021 at 20:32

Balu Vyamajala

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