1. Open the AWS Console
2. Click on your username near the top right and select Security Credentials
3. Click on Users in the sidebar
4. Click on your username
5. Click on the Security Credentials tab
6. Click Create Access Key
7. Click Show User Security Credentials

Make use of my JS script with your crendetials to get the db data saved in your local in json format.

https://github.com/atchyutn/scripts/blob/master/dynamoDBExport.js