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Working a lot with node.js, dynode and dynamoDB recently. Still trying to wrap my head around it all. Had a horrible time getting dynode.batchGetItem to work. Here is the error I was getting:

{ name: 'AmazonError',
type: 'ValidationException',
serviceName: 'com.amazon.coral.validate',
message: 'One or more parameter values were invalid: Mismatching attribute types between location and schema',
statusCode: 400,
retry: [Getter] }

Basically it came down to that the range selector I was using was being passed through as a string instead of a number. This is *even though* I am chaining queries, having just gotten the range selector out of another table and am immediately using it in the query that is failing. The way I was able to fix it was by casting it from a string into a number (the way Amazon expects it to come across):

results.Items.forEach(function(element, index, array){
    console.log(element);

    element.events.SS.forEach(function(ielement, iindex, iarray){
        var batchVars = {"events": {keys:[ {hash: ielement, range: parseInt(element.timestamp.N)} ]}};
        dynode.batchGetItem(batchVars, events.debugOutput);
    }, query);
}, query);

The crucial part here being this line:
{keys:[ {hash: ielement, range: parseInt(element.timestamp.N)} ]}

Note the "parseInt" function there that gets run on the timestamp that was pulled out of the previous query results. That's the key to getting this to work.

UPDATE:
The dynode author asked me to submit an issue, so, I did!

https://github.com/Wantworthy/dynode/issues/18

I had just assumed this was a quirk of the library. I feel way too new to all of this to know what is a bug and what is just me doing something stupidly...