How to insert or delete items from a DynamoDB table using Node.js

dynamoDbTest.js

var AWS = require('aws-sdk');

var region = "us-west-2";
var accessKeyId = process.env.DYNAMODB_ACCESS_KEY_ID;
var secretAccessKey = process.env.DYNAMODB_SECRET_ACCESS_KEY;
var tableName = "your table name";

var dynamoDB = new AWS.DynamoDB({
  region: region,
  accessKeyId: accessKeyId,
  secretAccessKey: secretAccessKey,
});

// One item with two properties: question_id and title.
var params = {
  Item: {
    question_id: {
      N: "12345" // Number value.
    },
    title: {
      S: "Foo foo foo" // String value.
    }
  },
  ReturnConsumedCapacity: "TOTAL",
  TableName: tableName,
};

dynamoDB.putItem(params, function(err, data) {
  if (err) {
    console.log(err, err.stack);
  }
  else {
    console.log(data);
  }
});

var fileItem = {
    Key: {
      question_id: {
        N: "1234" // My partition key is a number.
      }
    },
    TableName: tableName,
};

dynamoDB.deleteItem(fileItem, function(err, data) {
  if (err) {
    console.log(err, err.stack);
  }
  else {
    console.log(data);
  }
});

deleteItem is not a function