Can you publish a message to an SNS topic using an AWS Lambda function backed by node.js?

Question

Can you publish a message to an SNS topic using an AWS Lambda function backed by node.js?

Answer 1

First, you need to grant your Lambda IAM role permissions to publish to your SNS topic using proper IAM policy.

{
    "Action" : [
        "sns:Publish",
        "sns:Subscribe"
    ],
    "Effect" : "Allow",
    "Resource" : [
        { "Ref" : "" }
    ]
}

Then you can use following code to SNS publish to your SNS topic from your other Lambda or Node.js code.

var message = {};
var sns = new AWS.SNS();
sns.publish({
    TopicArn: "",
    Message: JSON.stringify(message)
}, function(err, data) {
    if(err) {
        console.error('error publishing to SNS');
        context.fail(err);
    } else {
        console.info('message published to SNS');
        context.succeed(null, data);
    }
});