AWS Lambda function have no event parameters when invoked from API Gateway

Question

I have a simple AWS Lambda, that fetches a JSON file from a S3 bucket and returns contents of the file. On top of it I created API Gateway for this lambda. Updated API with GET method, with query parameters, in execution pane. When I tested it form API gateway, all seems to work fine. When I try the same from NodeJS, Lambda logs clearly sow that none of the query parameters seem to be passed. I am clueless to how things can work from API gateway and not through my NodeJS application

Here is the code I used in generate template section

  ##  See http://docs.aws.amazon.com/apigateway/latest/developerguide/api-gateway-mapping-template-reference.html
##  This template will pass through all parameters including path, querystring, header, stage variables, and context through to the integration endpoint via the body/payload
#set($allParams = $input.params())
{
"body-json" : $input.json('$'),
"params" : {
#foreach($type in $allParams.keySet())
    #set($params = $allParams.get($type))
"$type" : {
    #foreach($paramName in $params.keySet())
    "$paramName" : "$util.escapeJavaScript($params.get($paramName))"
        #if($foreach.hasNext),#end
    #end
}
    #if($foreach.hasNext),#end
#end
},
"stage-variables" : {
#foreach($key in $stageVariables.keySet())
"$key" : "$util.escapeJavaScript($stageVariables.get($key))"
    #if($foreach.hasNext),#end
#end
},
"context" : {
    "account-id" : "$context.identity.accountId",
    "api-id" : "$context.apiId",
    "api-key" : "$context.identity.apiKey",
    "authorizer-principal-id" : "$context.authorizer.principalId",
    "caller" : "$context.identity.caller",
    "cognito-authentication-provider" : "$context.identity.cognitoAuthenticationProvider",
    "cognito-authentication-type" : "$context.identity.cognitoAuthenticationType",
    "cognito-identity-id" : "$context.identity.cognitoIdentityId",
    "cognito-identity-pool-id" : "$context.identity.cognitoIdentityPoolId",
    "http-method" : "$context.httpMethod",
    "stage" : "$context.stage",
    "source-ip" : "$context.identity.sourceIp",
    "user" : "$context.identity.user",
    "user-agent" : "$context.identity.userAgent",
    "user-arn" : "$context.identity.userArn",
    "request-id" : "$context.requestId",
    "resource-id" : "$context.resourceId",
    "resource-path" : "$context.resourcePath"
    }
}

Mark Mucha · Accepted Answer · 2017-04-18 15:01:30Z

2

If testing the API in the API Gateway console works as expected, then it sounds like you may need to deploy your API.

See the docs on deploying an API.

answered Apr 18, 2017 at 15:01

Mark Mucha

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J. Parashar · Accepted Answer · 2017-04-26 09:29:06Z

2

As Mark mentioned, you can try deploying.

Also, there is an Integration latency from API-Gateway to Lambda.

I would suggest to call the event by nesting it or somehow delay the event call on runtime may be by using promises, since nodejs being asynchronous, your event might be getting called before the data arrives.

Also, you can verify the latency by going to API-Gateway>APIs>'API-NAME'>Dashboard.

answered Apr 26, 2017 at 9:29

J. Parashar

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