Release announcements, how-to guides, and insights from the Dev Proxy team.https://devproxy.net/https://devproxy.net/blog/why-you-should-use-sdks-instead-of-raw-http-calls/https://devproxy.net/blog/why-you-should-use-sdks-instead-of-raw-http-calls/Ditching SDKs for raw fetch sounds productive until you realize you're rebuilding everything they already handle. Each API is different, and that's the problem.Wed, 15 Jul 2026 00:00:00 GMTWaldek Mastykarzhttps://devproxy.net/blog/dev-proxy-v4-0-0-alpha-1-with-experimental-kestrel-proxy-engine/https://devproxy.net/blog/dev-proxy-v4-0-0-alpha-1-with-experimental-kestrel-proxy-engine/Dev Proxy v4.0.0-alpha.1 is an experimental release that rebuilds the proxy engine on top of Kestrel, unlocking WebSocket inspection and more. It's an early alpha, and we'd love you to try it on your scenarios and tell us what breaks.Thu, 02 Jul 2026 00:00:00 GMTWaldek Mastykarz, Garry Trinderhttps://devproxy.net/blog/dev-proxy-v3-1-0-with-fixed-har-encoding-and-smarter-plugin-initialization/https://devproxy.net/blog/dev-proxy-v3-1-0-with-fixed-har-encoding-and-smarter-plugin-initialization/Dev Proxy v3.1.0 fixes HAR export encoding to properly handle character sets, and stops plugins from unnecessarily initializing when running CLI subcommands.Wed, 01 Jul 2026 00:00:00 GMTWaldek Mastykarz, Garry Trinderhttps://devproxy.net/blog/dev-proxy-v3-0-0-with-nuget-package-for-custom-plugins-and-api-key-authentication/https://devproxy.net/blog/dev-proxy-v3-0-0-with-nuget-package-for-custom-plugins-and-api-key-authentication/Dev Proxy v3.0 introduces the DevProxy.Abstractions NuGet package for building custom plugins, API key authentication for simulated CRUD APIs, important security fixes, and updated core dependencies.Thu, 28 May 2026 00:00:00 GMTWaldek Mastykarz, Garry Trinderhttps://devproxy.net/blog/dev-proxy-v2-4-0-with-accurate-ai-cost-tracking-and-ai-coding-agent-skill/https://devproxy.net/blog/dev-proxy-v2-4-0-with-accurate-ai-cost-tracking-and-ai-coding-agent-skill/Dev Proxy v2.4.0 brings accurate cached token pricing, model tagging for OpenTelemetry, upgrade-safe configuration downloads, improved LLM failure simulation, and a new skill for AI coding agents.Tue, 05 May 2026 00:00:00 GMTWaldek Mastykarz, Garry Trinderhttps://devproxy.net/blog/dev-proxy-v2-3-4-with-accurate-har-timestamps/https://devproxy.net/blog/dev-proxy-v2-3-4-with-accurate-har-timestamps/Dev Proxy v2.3.4 fixes HAR entry timestamps to reflect actual request times in proper UTC format, making your API recordings more reliable.Thu, 23 Apr 2026 00:00:00 GMTWaldek Mastykarz, Garry Trinderhttps://devproxy.net/blog/dev-proxy-v2-3-2-with-fixed-chrome-devtools-inspection/https://devproxy.net/blog/dev-proxy-v2-3-2-with-fixed-chrome-devtools-inspection/Dev Proxy v2.3.2 fixes Chrome DevTools inspection broken on Chromium 146+ (Chrome and Edge) by updating the WebSocket connection to use the IPv4 loopback address.Wed, 22 Apr 2026 00:00:00 GMTWaldek Mastykarz, Garry Trinderhttps://devproxy.net/blog/dev-proxy-v2-3-1-with-fixes-for-permissions-guidance-and-entra-mocking/https://devproxy.net/blog/dev-proxy-v2-3-1-with-fixes-for-permissions-guidance-and-entra-mocking/Dev Proxy v2.3.1 fixes GraphMinimalPermissionsGuidancePlugin not evaluating all application endpoints and EntraMockResponsePlugin crashing on startup.Tue, 14 Apr 2026 00:00:00 GMTWaldek Mastykarz, Garry Trinderhttps://devproxy.net/blog/dev-proxy-v2-3-with-improved-detached-mode-and-multi-instance-support/https://devproxy.net/blog/dev-proxy-v2-3-with-improved-detached-mode-and-multi-instance-support/We're excited to announce the release of Dev Proxy v2.3. This release brings significant improvements to detached mode, including proper JSON output, multi-instance support, and proxy URL visibility.Thu, 26 Mar 2026 00:00:00 GMTWaldek Mastykarz, Garry Trinderhttps://devproxy.net/blog/dev-proxy-v2-2-with-yaml-config-detached-mode-and-openai-responses-api/https://devproxy.net/blog/dev-proxy-v2-2-with-yaml-config-detached-mode-and-openai-responses-api/Dev Proxy v2.2 brings YAML configuration support, detached background mode, OpenAI Responses API support, structured JSON output, and major CLI improvements for agents and automation.Thu, 05 Mar 2026 00:00:00 GMTWaldek Mastykarz, Garry Trinderhttps://devproxy.net/blog/dev-proxy-v2-1-with-configuration-hot-reload-and-stdio-proxying/https://devproxy.net/blog/dev-proxy-v2-1-with-configuration-hot-reload-and-stdio-proxying/We're excited to announce the release of Dev Proxy v2.1.0! This release brings two major productivity features that developers have been asking for: automatic configuration hot reload and stdio traffic proxying.Thu, 29 Jan 2026 00:00:00 GMTWaldek Mastykarz, Garry Trinderhttps://devproxy.net/blog/dev-proxy-v2-0-with-improved-ai-telemetry-and-small-breaking-changes/https://devproxy.net/blog/dev-proxy-v2-0-with-improved-ai-telemetry-and-small-breaking-changes/We're excited to announce the release of Dev Proxy v2.0. Following semantic versioning (SemVer), we're bumping the major version due to breaking changes in...Thu, 04 Dec 2025 00:00:00 GMTWaldek Mastykarz, Garry Trinderhttps://devproxy.net/blog/dev-proxy-v1-3-with-exporting-to-har-llm-usage-tracking-and-enhanced-permissions-analysis/https://devproxy.net/blog/dev-proxy-v1-3-with-exporting-to-har-llm-usage-tracking-and-enhanced-permissions-analysis/We're thrilled to announce the release of Dev Proxy v1.3.0! This update introduces two powerful new plugins: HAR file generation for universal debugging and...Thu, 30 Oct 2025 00:00:00 GMTWaldek Mastykarz, Garry Trinderhttps://devproxy.net/blog/dev-proxy-v1-2-with-mock-response-mirroring-and-improved-performance/https://devproxy.net/blog/dev-proxy-v1-2-with-mock-response-mirroring-and-improved-performance/We're thrilled to announce the release of Dev Proxy v1.2! This update introduces mock response mirroring capabilities that make API simulation more...Tue, 23 Sep 2025 00:00:00 GMTWaldek Mastykarz, Garry Trinderhttps://devproxy.net/blog/dev-proxy-v1-1-with-improved-support-for-microsoft-graph-batching/https://devproxy.net/blog/dev-proxy-v1-1-with-improved-support-for-microsoft-graph-batching/We're excited to announce the release of Dev Proxy v1.1. This update delivers critical fixes for Microsoft Graph batch request simulation, resolves...Wed, 03 Sep 2025 00:00:00 GMTWaldek Mastykarz, Garry Trinderhttps://devproxy.net/blog/dev-proxy-v1-0-with-new-features-for-building-robust-ai-powered-apps/https://devproxy.net/blog/dev-proxy-v1-0-with-new-features-for-building-robust-ai-powered-apps/We're excited to announce Dev Proxy v1.0, with new language model-specific testing capabilities. This release introduces tools to help developers build more...Tue, 05 Aug 2025 00:00:00 GMTWaldek Mastykarz, Garry Trinderhttps://devproxy.net/blog/dev-proxy-v0-29-with-refactored-architecture-mcp-server-and-exposed-lm-prompts/https://devproxy.net/blog/dev-proxy-v0-29-with-refactored-architecture-mcp-server-and-exposed-lm-prompts/We're excited to introduce Dev Proxy v0.29, with a major architectural overhaul, control over language model prompts, and improved diagnostics. Whether...Wed, 25 Jun 2025 00:00:00 GMTWaldek Mastykarz, Garry Trinderhttps://devproxy.net/blog/dev-proxy-v0-28-with-llm-usage-and-costs-tracking/https://devproxy.net/blog/dev-proxy-v0-28-with-llm-usage-and-costs-tracking/We're thrilled to announce the release of Dev Proxy v0.28. This version introduces a new ability to help you understand language models' usage and costs in...Tue, 03 Jun 2025 00:00:00 GMTWaldek Mastykarz, Garry Trinderhttps://devproxy.net/blog/dev-proxy-v0-27-with-generating-typespec-files-and-configuring-using-natural-language/https://devproxy.net/blog/dev-proxy-v0-27-with-generating-typespec-files-and-configuring-using-natural-language/We're excited to announce the release of Dev Proxy v0.27. This version focuses on making Dev Proxy even more developer-friendly, helping you generate API...Tue, 29 Apr 2025 00:00:00 GMTWaldek Mastykarz, Garry Trinderhttps://devproxy.net/blog/dev-proxy-v0-26-with-improved-mocking-plugin-validation-and-docker-support/https://devproxy.net/blog/dev-proxy-v0-26-with-improved-mocking-plugin-validation-and-docker-support/We're excited to announce the release of Dev Proxy v0.26. This version brings improved validation, plugin reliability, an improved developer experience, and...Wed, 02 Apr 2025 00:00:00 GMTWaldek Mastykarz, Garry Trinderhttps://devproxy.net/blog/dev-proxy-v0-25-now-available-with-automatic-shut-down-and-simplified-configuration-management/https://devproxy.net/blog/dev-proxy-v0-25-now-available-with-automatic-shut-down-and-simplified-configuration-management/We're excited to announce the release of Dev Proxy v0.25. This update brings significant improvements to configuration management, plugin support, and...Thu, 27 Feb 2025 00:00:00 GMTGarry Trinder, Waldek Mastykarzhttps://devproxy.net/blog/dev-proxy-v0-24-with-improved-generating-openapi-specs/https://devproxy.net/blog/dev-proxy-v0-24-with-improved-generating-openapi-specs/We're thrilled to announce the release of Dev Proxy v0.24. If you're looking to simulate APIs and test your applications under real-world conditions, you...Wed, 29 Jan 2025 00:00:00 GMTWaldek Mastykarz, Garry Trinderhttps://devproxy.net/blog/dev-proxy-v0-23-with-inspecting-cloud-api-requests/https://devproxy.net/blog/dev-proxy-v0-23-with-inspecting-cloud-api-requests/We're excited to share with you a new version of Dev Proxy to help you build robust apps connected to APIs.Thu, 28 Nov 2024 00:00:00 GMTWaldek Mastykarz, Garry Trinderhttps://devproxy.net/blog/dev-proxy-v0-22-with-improved-checking-minimal-api-permissions-and-logging/https://devproxy.net/blog/dev-proxy-v0-22-with-improved-checking-minimal-api-permissions-and-logging/We're excited to share with you a new version of Dev Proxy that helps you build robust apps connected to APIs.Sun, 03 Nov 2024 00:00:00 GMTWaldek Mastykarz, Garry Trinderhttps://devproxy.net/blog/dev-proxy-v0-21-with-simulating-authentication-and-authorization/https://devproxy.net/blog/dev-proxy-v0-21-with-simulating-authentication-and-authorization/Achieve more with APIs in your organization. We're excited to share with you a new version of Dev Proxy that helps you to build robust apps connected to APIs.Mon, 30 Sep 2024 00:00:00 GMTWaldek Mastykarz, Garry Trinderhttps://devproxy.net/blog/dev-proxy-v0-20-with-improved-simulating-api-errors-and-a-new-api-for-building-integrations/https://devproxy.net/blog/dev-proxy-v0-20-with-improved-simulating-api-errors-and-a-new-api-for-building-integrations/We're excited to share with you a new version of Dev Proxy to help you build robust apps connected to APIs.Tue, 27 Aug 2024 00:00:00 GMTWaldek Mastykarz, Garry Trinderhttps://devproxy.net/blog/dev-proxy-v0-19-with-simulating-llm-apis-and-new-azure-api-center-integrations/https://devproxy.net/blog/dev-proxy-v0-19-with-simulating-llm-apis-and-new-azure-api-center-integrations/Achieve more with APIs in your organization. We're excited to share with you a new version of Dev Proxy that helps you to build robust apps connected to APIs.Tue, 25 Jun 2024 00:00:00 GMTWaldek Mastykarz, Garry Trinderhttps://devproxy.net/blog/dev-proxy-v0-18-with-reporters-better-ci-support-and-improved-azure-api-center-integration/https://devproxy.net/blog/dev-proxy-v0-18-with-reporters-better-ci-support-and-improved-azure-api-center-integration/Achieve more with APIs in your organization. We're excited to share with you a new version of Dev Proxy that helps you to build robust apps connected to APIs.Wed, 29 May 2024 00:00:00 GMTWaldek Mastykarz, Garry Trinderhttps://devproxy.net/blog/dev-proxy-v0-17-includes-integration-with-azure-api-center/https://devproxy.net/blog/dev-proxy-v0-17-includes-integration-with-azure-api-center/Achieve more with APIs in your organization. We're excited to share with you a new version of Dev Proxy that helps you to build robust apps connected to APIs.Sun, 28 Apr 2024 00:00:00 GMTGarry Trinder, Waldek Mastykarzhttps://devproxy.net/blog/building-custom-copilots-in-microsoft-teams-with-teams-app-test-tool-and-dev-proxy/https://devproxy.net/blog/building-custom-copilots-in-microsoft-teams-with-teams-app-test-tool-and-dev-proxy/Custom copilots are AI assistants that have been tailored to meet the specific needs of an organization. Microsoft Teams is where employees communicate and...Sun, 07 Apr 2024 00:00:00 GMTGarry Trinder, Waldek Mastykarzhttps://devproxy.net/blog/dev-proxy-v0-16-with-simulated-handling-teams-admin-center-notifications-for-microsoft-graph-connectors/https://devproxy.net/blog/dev-proxy-v0-16-with-simulated-handling-teams-admin-center-notifications-for-microsoft-graph-connectors/Focus on developing your app and not on things that won't go into production. See how your apps deal with API errors. We're excited to share the launch of...Thu, 28 Mar 2024 00:00:00 GMTWaldek Mastykarz, Garry Trinderhttps://devproxy.net/blog/simulate-handling-teams-admin-center-notifications-for-microsoft-graph-connectors/https://devproxy.net/blog/simulate-handling-teams-admin-center-notifications-for-microsoft-graph-connectors/Microsoft Graph connectors can be packaged as Microsoft Teams apps, enabling admins to deploy them in Teams Admin Center with a single click. This works by...Tue, 19 Mar 2024 00:00:00 GMTMajesty Uwagerikpe, Waldek Mastykarzhttps://devproxy.net/blog/dev-proxy-v0-15-with-simulating-crud-apis-secured-with-microsoft-entra/https://devproxy.net/blog/dev-proxy-v0-15-with-simulating-crud-apis-secured-with-microsoft-entra/We're excited to announce the release of Dev Proxy v0.15, with new features that allow you to spend more time building your app and less time on things you...Wed, 28 Feb 2024 00:00:00 GMTWaldek Mastykarz, Garry Trinderhttps://devproxy.net/blog/dev-proxy-v0-14-with-generating-openapi-specs-and-simulating-crud-apis/https://devproxy.net/blog/dev-proxy-v0-14-with-generating-openapi-specs-and-simulating-crud-apis/Spend more time on building your app and less on plumbing. Make your apps more robust. We're thrilled to announce the release of Dev Proxy v0.14.0, with...Thu, 18 Jan 2024 00:00:00 GMTWaldek Mastykarz, Garry Trinderhttps://devproxy.net/blog/dev-proxy-v0-13-with-new-guidance-and-inspecting-web-requests/https://devproxy.net/blog/dev-proxy-v0-13-with-new-guidance-and-inspecting-web-requests/Are you ready to build better apps? We are thrilled to announce the first release of Dev Proxy, formerly known as Microsoft 365 Developer Proxy.Mon, 04 Dec 2023 00:00:00 GMTWaldek Mastykarz, Garry Trinder