convert nodejs function to AWS Lambda compatible

Question

I am pretty new to both nodejs and AWS Lambda. I have created a very small nodejs function that is working fine locally. Now I need to run it on AWS Lambda, but looks like there are some handlers requirement which I am not understanding completely.

Below is my nodejs function that I need to run it on Lambda. Any idea what changes do I need to make to execute it on AWS? Thanks

(async function () {
DOMAIN = "abc.xyz.com";
KEY = "***";
const mailchimpClient = require("@mailchimp/mailchimp_transactional")(KEY);
    const run = async () => {
          const response = await mailchimpClient.senders.addDomain({
            domain: DOMAIN,
          });
          console.log(response);
        };
        
        run();
})();

JRichardsz · Accepted Answer · 2021-12-29 22:55:04Z

Basically you just need to export a function with a specific name: handler

exports.handler =  async function(event, context) {
  console.log("EVENT: \n" + JSON.stringify(event, null, 2))
  return "foo.bar"
}

In this handler, you just need to return something to mark as success or throw an error to mark as failure.

In your case, this should work:

var DOMAIN = "abc.xyz.com";
var KEY = "***";
const mailchimpClient = require("@mailchimp/mailchimp_transactional")(KEY);

exports.handler =  async function(event, context) {
  const response = await mailchimpClient.senders.addDomain({
    domain: DOMAIN,
  });
  console.log(response);
  return "success"
}

Here more examples and advanced configurations:

Dharman · Accepted Answer · 2021-12-29 22:57:34Z

1

It depends if you are using any framework to create your aws serverless code.

However, your usual code would be somthing like this.

    exports.handler = function(event, context) {
      console.log('Lambda A Received event:', JSON.stringify(event, null, 2));
      context.succeed('Hello ' + event.name);
    };

If you want a easier way to work with AWS serverless code such as Lambdas look at arc.codes

Also, here is a link to the AWS docs https://docs.aws.amazon.com/lambda/latest/dg/nodejs-handler.html

edited Dec 29, 2021 at 22:57

Dharman♦

33.9k27 gold badges103 silver badges157 bronze badges

answered Dec 29, 2021 at 22:51

Martin Patino

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2 Comments

Faisal Shani Over a year ago

Thanks for the comment. If I go with arc.codes or some alternative I would not need to make any changes on my actual function?

Martin Patino Over a year ago

I am missing a lot of context of what you are doing, but in short even if you write your code. It will be a pain to keep updating it and handle deploys this gets more tiring when you are handling multiple lambda functions. Arc codes makes this part easier and takes all that boilerplate code and complication and handles it for you. Here is a video on it: youtube.com/watch?v=h38wYQ4uCrM

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