Node Webhook Consumer with Serverless

Example code to demonstrate how to setup a simple HTTP POST endpoint to consume webhook data.

Based on: https://github.com/serverless/examples/tree/master/aws-node-simple-http-endpoint from serverless.

Read more about this on the "Inside the Embassy" Blog:

https://inside.getambassador.com/serverless-creating-a-webhook-consumer-in-5-minutes-4136adab06b0

Use Cases

• Consuming webhook data from a third-party API or service

Invoke the function locally

serverless invoke local --function webhookConsumer

Which should result in:

Serverless: Your function ran successfully.

{
    "statusCode": 200
}

Deploy

In order to deploy the you endpoint simply run

serverless deploy

The expected result should be similar to:

Serverless: Packaging service...
Serverless: Uploading CloudFormation file to S3...
Serverless: Uploading service .zip file to S3 (1.9 KB)...
Serverless: Updating Stack...
Serverless: Checking Stack update progress...
..............
Serverless: Stack update finished...
Service Information
service: test-webhook-endpoint
stage: dev
region: us-east-1
api keys:
  None
endpoints:
  POST - https://XXXXXXX.execute-api.us-east-1.amazonaws.com/dev/webhook
functions:
  webhookConsumer: test-webhook-endpoint-dev-webhookConsumer

Usage

You can now invoke the Lambda directly and even see the resulting log via

serverless invoke --function webhookConsumer --log

or as send an HTTP request directly to the endpoint using a tool like curl

curl https://XXXXXXX.execute-api.us-east-1.amazonaws.com/dev/ping

Scaling

By default, AWS Lambda limits the total concurrent executions across all functions within a given region to 100. The default limit is a safety limit that protects you from costs due to potential runaway or recursive functions during initial development and testing. To increase this limit above the default, follow the steps in To request a limit increase for concurrent executions.