serverless-dev-mode
io.github.serverless/serverless/serverless-dev-mode
Runs a deployed stage's Lambda invocations and web app requests locally with Serverless Framework Dev Mode (`serverless dev`): Node.js, TypeScript and Python handler edits, and web app servers (`webApps`, `dev.command`, `--local-only`), meet real events and real-URL requests with no redeploy. Use whenever a task drives a Dev Mode session, runs a web app against a deployed stage, reads `.serverless/dev/`, asks why a recent request or invocation failed where that folder exists, or meets a Dev Mode reason or `Runtime.DevMode*` error, even if Dev Mode is not named. Not for `--sandbox` or `--mode agents` sessions.