What Is the Lambda Handler

The Lambda function handler is the method in your function code that processes events. When your function is invoked, Lambda runs the handler method. When the handler exits or returns a response, it becomes available to handle another event.

What does a lambda do?

Lambda runs your code on high availability compute infrastructure and performs all the administration of your compute resources. This includes server and operating system maintenance, capacity provisioning and automatic scaling, code and security patch deployment, and code monitoring and logging.

Can AWS Lambda have multiple handlers?

Best practices suggest that one separate the handler from the Lambda’s core logic. Not only is it okay to add additional definitions, it can lead to more legible code and reduce waste–e.g. multiple API calls to S3.