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News, tutorials, and release notes from LocalStack — the local cloud development platform for AWS, Snowflake, and more.

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AWS Lambda Web Functions Are Here. Test Them Locally with LocalStack.

AWS Lambda Web Functions let you run full web apps and API backends on Lambda, with no adapters or custom configuration. LocalStack supports them from day one, so you can build and test those apps locally, alongside the rest of your application, before deploying to AWS.

LocalStack for Azure is now in Public Preview

Run core Azure services on your own machine. Build and test Azure applications locally, self-serve and free during the preview.

Azureannouncement

Running AWS Amplify Gen 2 Apps Locally with LocalStack

Learn how to deploy an AWS Amplify Gen 2 backend to LocalStack with ampx sandbox, run the React frontend against the local Cognito and AppSync endpoints, inspect the resources Amplify created, and iterate on the schema without an AWS account.

Announcing the LocalStack for AWS 2026.09.0 Release

LocalStack for AWS 2026.09.0 adds S3 Files, makes the new DynamoDB and Kinesis engines the default, adds Timestream scheduled queries, and expands CloudFormation update support.

releaseannouncement

Test Snowflake SQL Locally with Your AI Agent

We gave Claude Code the LocalStack MCP server and a CSV export of SaaS billing data, then asked it to build a quarterly Revenue-by-Plan report on our Snowflake emulator. It loaded the data, found & fixed two bugs, and proved the result, without touching the real Snowflake cloud.

SnowflakeAI Agents

Testing Cognito Authentication Flows Locally with LocalStack

Learn how to build and test Cognito flows against LocalStack: the hosted UI with auth code and PKCE, JWT verification against the pool's JWKS in an API Gateway authorizer, TOTP multi-factor auth, and machine-to-machine tokens from the client credentials grant.

CognitoAuthentication

Give Your AI Agent an Undo Button for AWS State

We gave Claude Code the LocalStack MCP server and a real AWS CDK app, then made a one-line change that looked harmless, which then silently destroyed the data on deployment. The agent caught it, rolled back to a Cloud Pod, and we fixed it forward, all through the MCP server.

Testing Lambda Durable Functions Locally with LocalStack

Learn how to build and test Lambda Durable Functions locally with LocalStack by deploying an order processing workflow with CDK, watching checkpointed steps retry a flaky payment gateway, surviving a restart mid-execution, and resuming the workflow with a callback.

LambdaDurable Functions

Introducing Application Emulators via WonderTwin AI: The Path to Emulating the World's Software

Learn about LocalStack's acquisition of WonderTwin AI and how application emulation enables agentic full-stack emulation for AI-native software development.

WonderTwin AIEmulation

Ask Your AI Agent to Break Your Cloud App

We asked Claude Code to run a chaos game day against a serverless data pipeline on LocalStack: define a steady state, inject faults into every hop, diagnose the failures from App Inspector traces, fix the pipeline, and prove the fix by replaying the same faults.

Chaos EngineeringAI Agents

Meet lstk: A Better Way to Use LocalStack from the CLI

Meet lstk, the new recommended LocalStack CLI. One install replaces the localstack CLI, awslocal, and Python dependencies, with browser-based login, unified snapshot management, TOML config, and the same commands in local development and CI/CD.

Beyond Bluesky: Building an AT Protocol Event Pipeline on AWS

AT Protocol is more than just Bluesky. This post explains what ATproto is, why it matters for event-driven apps, and how to build a reusable AWS pipeline for consuming it — including testing the full stack on LocalStack before touching a real account.