const AWS = require('aws-sdk');
const sns = new AWS.SNS({ region: 'REGION', apiVersion: '2015-03-31' });

const params = {
  Message: 'STRING_VALUE',
  MessageAttributes: {
    Url: { DataType: 'String', StringValue: 'STRING_VALUE' },
    Keys: { DataType: 'String', StringValue: 'STRING_VALUE' },
  },
  MessageStructure: 'STRING_VALUE',
  Subject: 'STRING_VALUE',
  TopicArn: 'TOPICARN',
};
sns.publish(params, (err, data) => {
  if (err) console.log(err, err.stack); // an error occurred
  else console.log(data); // successful response
});