Error: Lambda function response malformed, please check API Gateway configuration

Question

Error: Lambda function response malformed, please check API Gateway configuration

According to the official documentation, my JSON response should include a body, headers, and a status code, which it does. However, when testing in API Gateway, I am encountering issues with receiving a malformed response.

Below is the output of my method:

"{\"body\": 200, \"headers\": {\"Content-type\": \"application/json\"}, \"statusCode\": 200}"

def addnumbers(message, context):

    result = message['num1'] + 1
    print(result)
    resp = {
        "statusCode": 200,
         "body":  result,
        "headers": { "Content-type": "application/json"}
    }
    return (json.dumps(resp))

I have tried passing in num1=1, but it doesn't provide any useful error messages. Any guidance or assistance would be greatly appreciated.

json amazon-web-services aws-lambda

Answer 1

Answer №1

Alright, get ready for a detailed response.

First things first, make sure you have proxy integration enabled on the resource in your API that you want to work with.

Next step is to navigate to your lambda function. Take note of how I was previously attempting to pass in num1 from the "Event" or message. This was causing some issues for me initially. It's important to remember that (you can't perform a GET request with a body). Instead, the input to the lambda should look something like this:

{ "queryStringParameters": { "input": "Whatever input you want the lambda to test" } }

Now that we have configured our test for the lambda, it's time to actually write the code for the lambda itself.

I included this code snippet within :

def lambda_handler(event, context):
number = "Hello, " + event['queryStringParameters']['input']

out = {}
out['statusCode'] = 200
out['body'] = number

return (out)

If you run the test now, everything should be running smoothly.

Head back to the API Gateway and in the "Query Strings" Section, enter input=randomname

You should see the output as 'Hello, randomname'

Answer 2

Alright, get ready for a detailed response.

First things first, make sure you have proxy integration enabled on the resource in your API that you want to work with.

Next step is to navigate to your lambda function. Take note of how I was previously attempting to pass in num1 from the "Event" or message. This was causing some issues for me initially. It's important to remember that (you can't perform a GET request with a body). Instead, the input to the lambda should look something like this:

{ "queryStringParameters": { "input": "Whatever input you want the lambda to test" } }

Now that we have configured our test for the lambda, it's time to actually write the code for the lambda itself.

I included this code snippet within :

def lambda_handler(event, context):
number = "Hello, " + event['queryStringParameters']['input']

out = {}
out['statusCode'] = 200
out['body'] = number

return (out)

If you run the test now, everything should be running smoothly.

Head back to the API Gateway and in the "Query Strings" Section, enter input=randomname

You should see the output as 'Hello, randomname'

Error: Lambda function response malformed, please check API Gateway configuration

Answer №1

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