Error InvalidParameterType: Expected params.Item['pid'] to be a structure in DynamoDB

Question

Note: all these are happening on the local instance of DynamoDB.

This is the code that I\'ve used to create a table from the DynamoDB Shell:

var para         


        

Answer 1

Note: This answer may no longer be valid as mentioned in multiple comments below.

The function that must be used to add records into the database from nodejs is put and not putItem which is used in the DynamoDB shell. Changing the above function to the following fixed it.

function(request, response) {
  params = {
    TableName: 'TABLE-NAME',
    Item: {
      pid: 'abc123'
    }
  };
  console.log(params);
  dynamodb.put(params, function(err, data) {
    if (err)
      console.log(JSON.stringify(err, null, 2));
    else
      console.log(JSON.stringify(data, null, 2));
  });
}

Answer 2

The putItem() method on the AWS.DynamoDB class is expecting the params.Item object to be formatted as a AttributeValue representation. That means you would have to change this:

params = {
  TableName: 'TABLE-NAME',
  Item: {
    pid: 'abc123'
  }
};

Into this:

params = {
  TableName: 'TABLE-NAME',
  Item: {
    pid: {
      S: 'abc123'
    }
  }
};

---

If you want to use native javascript objects you should use the AWS.DynamoDB.DocumentClient class, that automatically marshals Javascript types onto DynamoDB AttributeValues like this:

• String -> S
• Number -> N
• Boolean -> BOOL
• null -> NULL
• Array -> L
• Object -> M
• Buffer, File, Blob, ArrayBuffer, DataView, and JavaScript typed arrays -> B

It provides a put() method, that delegates to AWS.DynamoDB.putItem().