Securing Your API with a Lambda Authorizer (JWT Validation) in AWS SAM

When building serverless APIs, security is critical. One common way to secure APIs is by requiring clients to present a JWT token. AWS API Gateway supports Lambda Authorizers, allowing you to write custom authorization logic using a Lambda function. In today's post, we’ll cover: What is a Lambda Authorizer? How to build a simple Lambda Authorizer with Node.js How to connect it to your API Gateway with AWS SAM

Apr 26, 2025 - 19:13
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Securing Your API with a Lambda Authorizer (JWT Validation) in AWS SAM

When building serverless APIs, security is critical. One common way to secure APIs is by requiring clients to present a JWT token.
AWS API Gateway supports Lambda Authorizers, allowing you to write custom authorization logic using a Lambda function.

In today's post, we’ll cover:

  • What is a Lambda Authorizer?
  • How to build a simple Lambda Authorizer with Node.js
  • How to connect it to your API Gateway with AWS SAM