How to call single item with DynamoDB?

Question

I'm trying to call getItem to DynamoDB. I'm using code samples from the documentation, however, all that I'm getting is null.

• I have a table called table.
• I have table row with Primary partition key called id (number).
• I don't have Primary sort key.
• Lambda function has the permission of Allow: dynamodb:GetItem

My item with id of 123 has few more rows attached to it, and I'd like to retrieve them all in the console log.

// Load the AWS SDK for Node.js
var AWS = require('aws-sdk');
// Set the region 
AWS.config.update({ region: 'eu-central-1' });

exports.handler = async (event) => {

  // Create the DynamoDB service object
  ddb = new AWS.DynamoDB({ apiVersion: '2012-10-08' });

  var params = {
    TableName: 'table',
    Key: {
      'id': { N: '123' },
    }
  };

  // Call DynamoDB to read the item from the table
  ddb.getItem(params, function (err, data) {
    if (err) {
      console.log("Error", err);
    } else {
      console.log("Success", data.Item);
    }
  });

};

Answer 1

var AWS = require('aws-sdk');
// Set the region 
AWS.config.update({region: 'REGION'});
exports.handler = (event, context, callback) => { 
// Create the DynamoDB service object
ddb = new AWS.DynamoDB({apiVersion: '2012-10-08'});

var params = {
  TableName: 'TABLE',
  Key: {
    'KEY_NAME' : {N: '123'},
  },
  ProjectionExpression: 'ATTRIBUTE_NAME'
};

// Call DynamoDB to read the item from the table

ddb.getItem(params, function(err, data) {
  if (err) {
    console.log("Error", err);
  } else {
    console.log("Success", data.Item);
  }
});
}

This is my lambda example you can try it.