Triggering an AWS Lambda from the Command-Line

As I'm starting to get more involved with playing with AWS Lambdas, I wondered if there was a better way to test the deployed Lambda without using the AWS UI.

It turns out this is well documented by AWS, and we can use the AWS CLI:

$ aws lambda invoke --function-name my-function --payload '{ "key": "value" }' response.json

This outputs information about whether the operation was a success to stdout, and the Lambda's response to response.json.

Remember that if you're using different AWS accounts/profiles, you'll need to specify the AWS profile before you run the above command.