LocalStack

You've spent hours perfecting your IaC with Terraform, CDK, etc. It's time to push it to the cloud & 🤞 that it works. If it doesn't, tear it all back down 🤞 & try again.

What if you could be confident your IaC will deploy & run as expected before you push it to the cloud? You can, using LocalStack.

Emulate AWS CI/CD Services in LocalStack Explore how the CI/CD service emulation capabilities in LocalStack allow fully local development and testing of pipelines including CodeBuild jobs, CodePipeline executions and CodeArtifact…

We've added new CI/CD service emulation capabilities in recent versions of LocalStack, enabling fully local pipeline development and testing, including CodeBuild jobs, CodePipeline executions, and CodeArtifact repos. Viren Nadkarni shows how in this post.

blog.localstack.cloud/emulate-ci-c...

Why wait for the cloud to test your app? In this episode, we’ll write and run an integration test to validate our LocalStack app. You’ll learn how to upload a file, trigger the Lambda-SQS-DynamoDB… Test Your Cloud Workflows Locally Like a Boss

Testing cloud apps can be slow due to spinning up, running & tearing down cloud resources. @blkgrlcto.bsky.social shows how to write & run integration tests locally using LocalStack to upload a file, trigger a Lambda-SQS-DynamoDB flow & assert results – all on your laptop. youtu.be/cXoQa8x8Qb4?...

July highlights:

🌏 OSS contribution from Darasimi Ajewole
💪🏿 Internal engineering updates improving speed, search & content accuracy
🗒️ Release notes: AWS v4.7.0 & Snowflake v1.1
📊 Usage trends shaping next updates
🗺️ Sneak peek: reimagined Getting Started flow

What’s New in LocalStack Docs: July 2025 We’re excited to kick off a new tradition at LocalStack: a monthly blog report that celebrates the people, changes, and insights shaping our documentation.

🥳 New tradition at LocalStack: monthly public docs reports! 🫶🏿

We’re kicking off a new tradition at LocalStack: sharing our biggest documentation updates, insights, and thank-you’s.

🔗 Read the July report:
blog.localstack.cloud/whats-new-in...

Accelerating Developer Productivity with Dagger and LocalStack, Wed, Aug 27, 2025, 4:00 PM | Meetup Join our August meetup to discover how programmable pipelines and local cloud emulation can supercharge your CI/CD workflows. Jason from Dagger will introduce the core con

Join our next community meetup to learn how Dagger lets you treat pipelines as code, run them locally & compose them like software components. See how you can run full AWS emulation locally on LocalStack within Dagger pipelines.

Join us on August 27. Register here 👉 www.meetup.com/localstack-c...

We’d love to hear your perspective:

· Does this separation make it easier to follow what’s relevant to you?
· Are there topics or formats you’d like to see more (or less) of?
· How can we make these updates more valuable for your work?

Your feedback helps us make better decisions! 🍻

Our goal was to make it easier for you to find what matters most. Whether you’re here to follow the community or to stay on top of product changes.

But the real measure of success is whether this approach is actually more useful for you. 🫵🏿

We’ve been making changes to how we share updates with you. 🫶🏿

Recently, we split our monthly newsletter into two distinct issues:

1) Community Meetup & Contributions
2) Product Releases & Blog Posts

In this 5 min tutorial, Kiah teaches:

✅ Run integration tests on AWS services like S3, Lambda, SQS, & DynamoDB locally
✅ Use Python, pytest, & boto3 to verify your pipeline works
✅ Avoid hard-coded resource names using prefix-based lookups
✅ Skip AWS bills, test like a pro

Testing Your AWS Serverless App Locally Like a Boss (or at Least Like Someone Who Writes Tests 😅) Writing tests for serverless apps often feels like herding cats in the cloud. In this tutorial, learn how to run real integration tests on your AWS stack, including S3, Lambda, SQS, and DynamoDB,…

Testing your AWS serverless app locally?

Stop crossing your fingers and start writing tests like a boss!

Because “it worked on my machine” won’t save you when your coworker “optimizes” a Lambda with mysterious regex from ChatGPT. 😅

🔗 blog.localstack.cloud/testing-your...

The mock syntax is fully compatible with Step Functions Local.

Peter’s blog post covers:

✅ A working example using a stock-trading workflow
✅ Clean patterns for Buy vs Sell path testing
✅ Mountable mocking files for use in Docker or CI
✅ Naming, setup, & env flags tips

In this new tutorial by Peter Smith:

· Run real Step Functions workflows locally with LocalStack
· Use mock configuration files to simulate service integrations
· Skip expensive or side-effect-heavy states (like Lambda calls or DB writes)
· Run deterministic test cases directly in CI pipelines

The good news?

LocalStack now supports the same mocking features, plus full support for the latest Step Functions features like JSONata, Variables, and Distributed Map.

LocalStack as a Drop-in Replacement for Step Functions Local Learn how to use LocalStack as a drop-in replacement for AWS Step Functions Local to test your state machine workflows locally with mocking capabilities, allowing you to avoid undesirable side…

AWS deprecated Step Functions Local, so LocalStack built a drop-in replacement. 💪🏿

If you’ve used Step Functions Local for testing workflows, mocking services, and avoiding side effects… you probably noticed it’s no longer supported by AWS!

blog.localstack.cloud/aws-step-fun...

Example pattern:

1) Create init.sql with your tables, schemas, and seed data.

2) Pass it into LocalStack when starting Snowflake locally in CI:

LOCALSTACK_INIT_SCRIPTS=/path/to/init.sql localstack start

3) Run your tests against an environment that’s always clean and predictable.

That means every CI job (or local run) starts with:

· The exact schema you expect: no drift from previous runs
· Preloaded data: no need to insert rows in every test
· Guaranteed isolation: no chance of corrupting shared or staging data

A better workflow?

Preload your environment with an init.sql script that sets up your schema and inserts test data before any queries run. 😎

Welcome to LocalStack for Snowflake Docs LocalStack for Snowflake allows you to develop and test your Snowflake data pipelines entirely on your local machine!

LocalStack + Snowflake Tip: Initialize clean local test environments

When you run Snowflake locally with LocalStack (especially in CI), it’s easy to spend more time prepping your environment than running your tests. 😤

docs.localstack.cloud/snowflake/

If you’ve:
· Built something cool with LocalStack
· Solved a pain point that used to slow you down
· Figured out a workflow that others could benefit from

…we want the LocalStack community to hear about it! 📣

Here’s the truth: the talks that inspire people most don’t come from us.

They come from YOU. 🫶🏿 Our customers, contributors, and community members.

That’s why we want to feature more of your voices in our upcoming meetups!

Your story deserves the spotlight.

Every month, the LocalStack Community Meetup brings builders together from around the world. We share workflows, architectures, and lessons that help us all build faster, safer, and smarter.

🔗 www.meetup.com/localstack-c...

When they realize you're faking the whole cloud with LocalStack 😏

Announcing the LocalStack for AWS 4.7 Release LocalStack 4.7 is now available! This release introduces Valkey engine support for ElastiCache and MemoryDB, a new native Organizations provider for multi-account management, AppSync Events API for re...

LocalStack 4.7 is LIVE 🪄

This release brings ▶️

🧨 Valkey support for ElastiCache & MemoryDB
🚀 New & Native AWS Organizations provider
🌳 AppSync Events API Support
🐘 Enhancements across CodeBuild, CodeTrail, EKS

Learn more: blog.localstack.cloud/localstack-f...

#LocalStack #AWS

Announcing the LocalStack for Snowflake 1.1 Release LocalStack for Snowflake 1.1 is now available! This release introduces a new way to start the Snowflake emulator via CLI, Snowflake REST APIs, Compute Pools, Security Integrations, JavaScript Stored…

Just dropped: LocalStack for Snowflake 1.1 ❄️

• REST API support
• Compute Pools
• JavaScript Stored Procs
• Change Tracking
• +30 new SQL functions

More Snowflake parity. Zero cloud spend.

🔗 Dive in: blog.localstack.cloud/localstack-f...

Local Development for AI Workflows and Cloud-Native Apps with LocalStack Join our next meetup for a hands-on look at how LocalStack enables local development and testing for AI-powered and cloud-native applications.• Waldemar Humm...

We’re excited to kick off our meetup, where we’ll explore local development and testing for AI-powered and cloud-native applications using LocalStack.

• Develop and test your AI-powered cloud apps locally by Waldemar
• Fake It Till You Make It: Cloud Edition by Kiah

Join → localstack.cloud/live

Local Development for AI Workflows and Cloud-Native Apps with LocalStack, Tue, Jul 29, 2025, 4:00 PM | Meetup Join our next meetup for a hands-on look at how LocalStack enables local development and testing for AI-powered and cloud-native applications. Waldemar Hummer will walk th

🚨 July meetup TOMORROW!
Learn how to build & test AI-powered, cloud-native apps entirely locally with LocalStack.

🧠 AI workflows
⚙️ Full AWS stack emulation
💸 $0 cloud bill

Featuring @whummer.bsky.social & @blkgrlcto.bsky.social. Don’t miss it!
🔗 www.meetup.com/localstack-c...

It really do be like that sometimes 🤷‍♀️🤷‍♂️

#LocalStack #AWS #CloudDevelopment #CloudTesting

🚀 Our LocalStack meetup community has officially crossed 1,000+ members!

From cloud developers to DevOps engineers, from startups to enterprises — thank you to everyone who's made this community thrive.

Don't miss out on the action. Join our community: www.meetup.com/localstack-c...

Why I Run My AWS Serverless Apps Locally First (and You Probably Should Too) Tired of waiting on CloudFormation, racking up bills, and debugging invisible resources? Learn how to run a real serverless app (S3, Lambda, SQS, and DynamoDB) entirely on your laptop using LocalStack...

Tired of waiting on CloudFormation, racking up bills, and debugging invisible resources?

Learn how to run a real serverless app entirely on your laptop using LocalStack, with step-by-step commands and explanations.

Check out this guide by Kiah to get started: blog.localstack.cloud/why-i-run-my...