Build a Production-Ready Serverless API With AWS SAM and TypeScript
Most serverless tutorials leave you with a toy: a single "hello world" Lambda that teaches you nothing about IAM, a DynamoDB table you never actually touch, and zero thought about what happens when a real request goes sideways. I wanted the opposite — a starting point that is small enough to read in one sitting but shaped like production: least-privilege IAM, typed data access, fail-closed error handling, CORS that actually works, and the gotchas that cost people real hours written down where you'll see them before they bite.
This article walks through the starter kit I ended up with: four TypeScript Lambda functions, one DynamoDB table, and one SAM template — no CDK, no bundler, no opinionated framework. By the end you'll have the whole architecture in your head, and a repo you can clone, deploy, and grow into a real product.
The 30-second mental model
Browser -> API...
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