Amazon Lambda Node.js 12.x async handler function example

index.js

/* Grr, Amazon's documentation sucks!
 * Their own documentation: https://docs.aws.amazon.com/lambda/latest/dg/nodejs-prog-model-handler.html
 *   says that you're allowed to return strings, but that always results in "Internal Server Error"!
 * In reality, your result has to be structured like the one you see below.
 */

exports.handler = async (event, context) => {
  return {
    statusCode: 200,
    headers: {
      'Content-Type': 'application/json'
    },
    body: JSON.stringify({"here is": "an example"})
  };
}

/* Note:
 *
 *   They say you can return "a response, error, or promise."
 *
 *   If you want to return a promise, do resolve(the same response format as above).
 *   If you want to return an error, not sure what exactly the response should look like,
 *     I'm guessing it should be the same but with statusCode set to some error status code.
 */