How do I map multiple HTTP parameters to a JSON array using AWS API Gateway

Question

I have a Lambda that takes a list of skus,

{ "skus" : [
    "sku1", 
    "sku2"
    ] 
}

I want to invoke it from HTTP requests to either

/inventory/sku1,sku2

or

/inventory?sku=sku1&sku=sku2

How can I achieve that mapping in API Gateway?

Look at example here docs.aws.amazon.com/apigateway/latest/developerguide/… under header "Param Mapping Template Example". — Egor Stambakio
– Egor Stambakio, Commented Jul 14, 2017 at 7:27
Thanks, but I don't see any help there parsing /inventory/sku1,sku2 into a list to iterate over, and, at least in the Method Test UI, I don't seem to be able to repeat a query string parameter — Duncan McGregor
– Duncan McGregor, Commented Jul 14, 2017 at 7:46
Is it ok for you to make a GET request like /?skus=[1,2,3,4] ? In this case you can just map one param. — Egor Stambakio
– Egor Stambakio, Commented Jul 14, 2017 at 8:32
That doesn't look ideal, but I think I have discovered a solution — Duncan McGregor
– Duncan McGregor, Commented Jul 14, 2017 at 8:46

Duncan McGregor · Accepted Answer · 2017-07-14 08:47:32Z

3

You can use String::split for the path-based approach.

#set($skus = $input.params('skus').split(","))
{
  "skus": [ 
     #foreach($sku in $skus)
      "$sku"
     #if($foreach.hasNext),#end
     #end
  ]
}

answered Jul 14, 2017 at 8:47

Duncan McGregor

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