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

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().