News, tutorials, and insights from the LocalStack team on cloud emulation, product showcases, and local development practices.https://blog.localstack.cloud/https://blog.localstack.cloud/build-authenticated-apps-locally-keycloak-localstack/https://blog.localstack.cloud/build-authenticated-apps-locally-keycloak-localstack/Learn how to use the Keycloak extension to add OAuth2/OIDC authentication to your AWS apps. Walk through a sample app with API Gateway, Lambda, and DynamoDB that uses Keycloak JWTs for role-based access control, all running locally without cloud dependencies.Mon, 20 Apr 2026 00:00:00 GMThttps://blog.localstack.cloud/how-to-build-your-own-localstack-extension/https://blog.localstack.cloud/how-to-build-your-own-localstack-extension/LocalStack Extensions can facilitate specialized workflows or development needs. This guide walks through using LocalStack's Extensions API to create a mock API for Anthropic, a popular LLM provider, that allows you to test your application code without relying on the live service.Thu, 16 Apr 2026 00:00:00 GMThttps://blog.localstack.cloud/build-search-apps-locally-paradedb-localstack/https://blog.localstack.cloud/build-search-apps-locally-paradedb-localstack/Learn how to build search applications locally with LocalStack and ParadeDB, a Postgres-based search and analytics engine including a sample app to understand the schema, data and query relationships, and how LocalStack and ParadeDB fit together.Thu, 12 Mar 2026 00:00:00 GMThttps://blog.localstack.cloud/simulate-external-apis-locally-with-the-wiremock-extension-for-localstack/https://blog.localstack.cloud/simulate-external-apis-locally-with-the-wiremock-extension-for-localstack/Learn how to use the WireMock extension for LocalStack to simulate external APIs locally. You'll learn how to install and use the extension with a sample application to mock OpenAI API responses, enabling deterministic integration testing without external dependencies.Tue, 10 Feb 2026 00:00:00 GMThttps://blog.localstack.cloud/build-knowledge-graph-applications-localstack-typedb-extension/https://blog.localstack.cloud/build-knowledge-graph-applications-localstack-typedb-extension/Learn how to build knowledge graph applications with TypeDB extension for LocalStack. You'll learn how to install and use the extension with a sample application to understand the TypeDB schema, data and query relationships, and how LocalStack and TypeDB fit together.Tue, 03 Feb 2026 00:00:00 GMThttps://blog.localstack.cloud/local-testing-ses-workflows-localstack-mailhog-extension/https://blog.localstack.cloud/local-testing-ses-workflows-localstack-mailhog-extension/Explore how you can test SES email workflows locally using LocalStack with our MailHog extension. You'll learn how you can configure a Lambda function to handle email delivery via SES, perform local testing with Jest, and enable a fully local development workflow without needing real AWS credentials.Mon, 06 Jan 2025 00:00:00 GMThttps://blog.localstack.cloud/2022-09-12-announcing-localstack-extensions/https://blog.localstack.cloud/2022-09-12-announcing-localstack-extensions/With LocalStack 1.0 we have introduced LocalStack Extensions that allow developers to extend and customize LocalStack. You can now use Extensions to add new services, extend existing services, and even add custom functionality.Mon, 12 Sep 2022 00:00:00 GMT