An API Gateway mapping template to output all HTTP parameters in the JSON body

gistfile1.txt

#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
    }
}

I was unable to get this to run but by removing the quotes around $input.json('$') it seems to work:

"body-json" : $input.json('$'),

Before I did that I received an error when posting a json body:

Body:

{
     "hello": "world" 
}

Error:

Could not parse request body into json: Unexpected character (\'h\'

@carlnordenfelt Thanks! That quotes cost me several hours.....

This mapping template just results in errors for me, even when removing the quotes around $input.json('$'). :(

{"message": "Could not parse request body into json: Unrecognized token 'json': was expecting ('true', 'false' or 'null')\n at [Source: [B@41ebdee4; line: 1, column: 6]"}