実行ロールには、DynamoDB へのアクセス権がついている必要があります。
出力結果は、CloudWatch で確認が出来ます。

テーブルの一覧

list_tables.js

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

var dynamodb = new AWS.DynamoDB({region: 'ap-northeast-1'})

var params = {    Limit: 100}

exports.handler = async (event) => {

console.log("*** start ***")

try {
	var data = await dynamodb.listTables(params).promise()
	console.log(data)
	} catch (ee) {
		console.log(ee)
	}

 
const response = {
        statusCode: 200,
        body: JSON.stringify('Hello from Lambda!'),
    }
    return response;
}

テーブルの説明

describe_table.js

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

var dynamodb = new AWS.DynamoDB({region: 'ap-northeast-1'})

var table = "Movies"
var params = {TableName: table}

exports.handler = async (event) => {
    
console.log("*** start ***")

try {
    var data = await dynamodb.describeTable(params).promise()
    console.log(data)
    } catch (ee) {
       console.log(ee)
    }

    const response = {
        statusCode: 200,
        body: JSON.stringify('Hello from Lambda!'),
    }
    return response
}