AWS Lambda Sandbox
Runs in your browserTest Node.js Lambda handlers against canonical event payloads from API Gateway, SQS, S3, EventBridge, and more. Handlers execute in an isolated Web Worker — no AWS credentials, no network calls, nothing leaves your device.
Handler
Node.js 20.xEvent
Configuration
Environment variables
Click Invoke to run the handler. Output, logs, and timing will appear here.
Sandbox limits: Code runs in a Web Worker with no DOM, no fetch to AWS, and no real require(). Calls to aws-sdk or @aws-sdk/* will throw — stub or mock them in your handler before testing. Timeout is enforced exactly like Lambda.