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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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Get LocalStack running on day one, even behind a corporate firewall

Proxies, TLS inspection, and locked-down laptops can stall a first LocalStack run. lstk doctor runs 11 checks in one pass, finds the root cause, and gives you the exact fix.

lstkDeveloper Experience

Give Every AI Agent Its Own Ephemeral Instance

We pointed several AI agents to build an AWS app in parallel, using the LocalStack MCP Server. Each agent built a different part of the app in its own Git worktree and deployed to a separate Ephemeral Instance, avoiding conflicts and making it easier for agents to work independently.

Running Lambda Web Functions Locally with LocalStack

Learn how to run AWS Lambda Web Functions locally with LocalStack by deploying an Express URL shortener backed by DynamoDB and S3 with the AWS CLI, calling its endpoint, and reading its logs and metrics.

Lambda Web FunctionsServerless

AI Writes the Code. Who Tests It? Inside the State of AI in Cloud Development 2026

309 developers and managers on AI in software development: 79% give AI agents cloud access, 97% worry, and nearly 40% of AI code never ships.

Building an Event Hubs App Locally with LocalStack for Azure

Build and test a real-time payment fraud detection pipeline locally with LocalStack for Azure. Stream payments through Event Hubs using AMQP, Kafka, and HTTPS, process them with Azure Functions, and explore checkpoints, Event Hubs Capture, and Blob Storage before deploying to Azure.

AzureEvent Hubs

Announcing the LocalStack for AWS 2026.10.0 Release

LocalStack for AWS 2026.10.0 introduces Lambda Web Functions for running Node.js web applications behind HTTPS endpoints, adds native EventBridge Scheduler emulation, and expands API Gateway behavior.

ReleaseAnnouncement

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