aws DynamoDB getItem InvalidParameterType 错误

Question

I've been trying to communicate my ReactJS app with aws DynamoDB, but keeps getting InvalidParameterType error. apikey, secret key and region have been confirmed correct. Skip the UI part, I've tried hard-code the request Key to params so the error doesn't come from other parts. the related code is:

var AWS = require('aws-sdk');
var client = new AWS.DynamoDB({apiVersion: '2012-08-10'});
var params = {
  TableName: "customer",
  Key:
    {
      "email" : "12345@qwerrrr.com"
    }
}
client.getItem(params, function(err, data) {
    if(err){
        console.log(err);
    }else{
        console.log(data)
    }
});`

error is(skipping the same parts that's key '0' to '16'):

  Error: There were 18 validation errors:
* InvalidParameterType: Expected params.Key['email'] to be a structure
* UnexpectedParameter: Unexpected key '0' found in params.Key['email']

my dynamoDB looks like this:

Answer 1

Your key parameter should look something like this:

Key : { 
  "email" : {
    "S" : "12345@qwerrrr.com"
  }
}

As seen here: http://docs.aws.amazon.com/AWSJavaScriptSDK/latest/AWS/DynamoDB.html#getItem-property

Answer 2

You can use AWS.DynamoDB.DocumentClient to avoid having to specify types.

http://docs.aws.amazon.com/AWSJavaScriptSDK/latest/AWS/DynamoDB/DocumentClient.html#get-property

var AWS = require('aws-sdk');
var client = new AWS.DynamoDB.DocumentClient({apiVersion: '2012-08-10'});
var params = {
  TableName: "customer",
  Key:
    {
      "email" : "12345@qwerrrr.com"
    }
};
client.get(params, function(err, data) {
    if(err){
        console.log(err);
    }else{
        console.log(data)
    }
});`