A small example of how you can test your lambdas locally like, simulating how they should behave behind an API Gateway on AWS.
There is an article on Medium here.
Run these commands
docker-compose -f "./docker-compose.yml" up -d --build
cd aws
terraform init
terraform apply -auto-approve
and go to http://localhost:9001 to try it out.
Obviously you need docker and terraform.
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