How can I pass input (event) parameters through API Gateway into Lambda

Question

I understand that API Gateway (AG) passes params into Lambda as JSON payload.

I have setup a POST API with Lambda Proxy in AG. My lambda function takes the following param list :

{
  "fullname": "Mr xxxxx",
  "clientemail": "[email protected]",
  "clientphone": "0800 088 8888",
  "locationtext": "Laxxxxxx Hotel , CA, USA",
  "subject": "Gxxxxxrth",
  "appointmentblock_min": "60",
  "buffer": "120",
  "calendar_id": "xxxxx",
  "thedate": "2021-03-2xxxxxx",
  "thetime": "xxxxx"
}

Testing directly within the Lambda console. Everything works fine. I map all parameters in the code using the lambda EVENT object as follows :

fullname = event['fullname']  
clientemail = event['clientemail']
appointmentblock_min = int(event['appointmentblock_min'])

... and so on.

All code works fine.

Adding the API Gateway component on top ... and things don't work.

The specific problem : how can I map the lambda input parameters coming from API Gateway (AG) to lambda ? I realise that AG is sending JSON into Lambda. How to parse this payload to extract and use the parameters that I need.

I have tried to create a dict containing all the parameters :

Event = {}
Event = json.loads(body)
Event = json.loads(event.body)

No docs explicitly explain how to grab the event object params via AG.

Any help would be appreciated.

PS I am expecting to return data back to AG as follows :

return {
            'statusCode': 200,
            'headers': {'Content-Type': 'application/json'},
            'body': json.dumps(out_message),
            'isBase64Encoded': 'false'
        }

Thank you for your consideration.

AG Error : Tue Mar 23 19:49:32 UTC 2021 : Lambda execution failed with status 200 due to customer function error: 'thedate'. Lambda request id: 328e-4263-9237-174dce236e44 Tue Mar 23 19:49:32 UTC 2021 : Method completed with status: 502 thedate refers to Lambda code . Assign the variable 'thedate' to input param : thedate = event['thedate'] — PerryS
– PerryS, Commented Mar 23, 2021 at 19:51

Juan Carlos Gamez Cuevas · Accepted Answer · 2021-03-23 19:51:08Z

2

According to TestEvents in Lambda, the input you get on Lambda will be

LambdaTest

So you can load your payload (or body) as

Event = json.loads(event['body'])

answered Mar 23, 2021 at 19:51

Juan Carlos Gamez Cuevas

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