AWS Lambda function to publish to SNS topic

sns-publish

console.log('Loading function');

var AWS = require('aws-sdk');  
AWS.config.region = 'us-west-2';

exports.handler = function(event, context) {  
    console.log("\n\nLoading handler\n\n");
    var sns = new AWS.SNS();

    sns.publish({
        Message: 'Test publish to SNS from Lambda',
        TopicArn: 'TOPIC_ARN'
    }, function(err, data) {
        if (err) {
            console.log(err.stack);
            return;
        }
        console.log('push sent');
        console.log(data);
        context.done(null, 'Function Finished!');  
    });
};

I hope you might using the same Lambda function for both write and subscribe to a topic, it leads to - endless loop

Where I can see message published to SNS topic?

Is using aws-sdk the intended way to publish to SNS? SNS can be a trigger for a function, yet I haven't seen a corresponding way to generate SNS messages.

i want to send push run time of lambda code .Ex i post job and on success i want to send push to predefine deviceIds .
what is the way with SNS plz tell me

It works with me but I didn't add the TopicARN.

Thanks! I adapted this for a project that fires SNS notifications after a file is uploaded to an S3 bucket and triggers a Lambda event. It worked great on the first try after plugging in the TopicARN.