Learn AWS Serverless Computing

Testing, monitoring, and debugging

Now, you have a Lambda function deployed and ready to go. Let's test it to see if it works as expected! We're going to touch on the basic concepts of testing and debugging Lambdas and then delve more deeply into this in Chapter 6, Going Deeper with Lambda.

To test a function, we need to come up with an event object to invoke it with. If your function doesn't use anything from the event object, then this can simply be some arbitrary JSON data. If your function is being called by another service, then it's likely to be invoked with an event object of a known structure.

For example, here's a simplified event object from an SQS queue event source:

{    "Records": [        { "messageId": "19dd0b57-b21e-4ac1-bd88-01bbb068cb78", ...