How do I Pass JSON as a parameter to AWS Lambda

Question

I have a CloudFormation template that consists of a Lambda function that reads messages from the SQS Queue.

Lambda function will read the message from the queue and transform it using a JSON template(Which I want it to be injected externally)

I will deploy different stacks for different products and for each product I will provide different JSON templates to be used for transformation.

I have different options but couldn't decide which one is better;

1. I can write all JSON files under the project and pack them together and pass related JSON name as a parameter to lambda.
2. I can store JSON files on S3 and pass S3 URL to lambda so I can read on runtime.
3. I can store JSON files on Dynamo DB and read from there using the same approach with 2

The first one seems like a better approach as I don't need to read from an external file on every lambda execution. But I will need to pack all templates together.

The last two are a more clear approach but require an external call to read JSON for every call.

Another approach could be (I'm not sure if it is possible) to inject a JSON file to Lambda on deploy from S3 bucket or sth. And Lambda function will read it like an environment variable.

Answer 1

I decided to go with S3 setup and also improved efficiency by storing Json on a global variable (after reading the first time). So I read once and use it for the lifetime of the Lambda container.

I'm not sure this is the best solution but works well enough for my scenario.