aws api gateway integration request mapping template for aws lambda

req-mapping.json

{
  "method": "$context.httpMethod",
  "resourcePath": "$context.resourcePath",
  "querystring": {
    #foreach($key in $input.params().querystring.keySet())
    "$key": "$input.params().querystring.get($key)"#if($foreach.hasNext),#end
    #end
  },
  "path": {
    #foreach($key in $input.params().path.keySet())
    "$key": "$input.params().path.get($key)"#if($foreach.hasNext),#end
    #end
  },
  "header": {
    #foreach($key in $input.params().header.keySet())
    "$key": "$input.params().header.get($key)"#if($foreach.hasNext),#end
    #end
  }
}

not quite json ...

This is an AWS API Gateway integration request mapping template for lambda that populates the lambda event with most of the http stuff you really want. Specifically, try it with a lambda function like:

exports.handler = function(event, context) {
    console.log('event', JSON.stringify(event, null, 4))

    context.succeed(event)
}

You can then curl that lambda, passing with something like

curl "https://{rando-chars-here}.execute-api.us-east-1.amazonaws.com/test/tester/g?x=4&y=5" | json

(assumes you set up test/tester/g as a resource)

and then see something like this:

{
  "method": "GET",
  "resourcePath": "/tester/{id}",
  "querystring": {
    "x": "4",
    "y": "5"
  },
  "path": {
    "id": "g"
  },
  "header": {
    "Accept": "*/*",
    "CloudFront-Forwarded-Proto": "https",
    "CloudFront-Is-Desktop-Viewer": "true",
    "CloudFront-Is-Mobile-Viewer": "false",
    "CloudFront-Is-SmartTV-Viewer": "false",
    "CloudFront-Is-Tablet-Viewer": "false",
    "CloudFront-Viewer-Country": "US",
    "Host": "{rando-chars-here}.execute-api.us-east-1.amazonaws.com",
    "User-Agent": "curl/7.43.0",
    "Via": "1.1 {rando-chars-here}.cloudfront.net (CloudFront)",
    "X-Amz-Cf-Id": "{rando-chars-here}==",
    "X-Forwarded-For": "{rando-ip-here}, {rando-ip-here}",
    "X-Forwarded-Port": "443",
    "X-Forwarded-Proto": "https"
  }
}