Getting the Request ID of a Lambda Invocation when Using Promises With the AWS SDK

Every invocation of an AWS Lambda function is associated with a request ID. Searching the CloudWatch logs with the request ID is the quickest way to find the logs of a given invocation.

To get the request ID when using the JavaScript AWS SDK, you can access the $response property of the response:

const AWS = require('aws-sdk');
const lambda = new AWS.Lambda();

const response = await lambda.invoke({
  ...
}).promise();

const requestId = response.$response.requestId;

The entire response object from the HTTP request is available to you via the $response object. Also, the $response object is available across almost all API calls, not just lambda.invoke().promise().

If you ever want to track down the results of a single invocation among many, consider logging the response ID.