Microsoft Dev Proxy
Microsoft Dev Proxy: A free open-source proxy for API simulation, traffic control, and CI/CD workflows. Ranked #23 of 27 in Web Debugging Proxies by our editors (6.9/10); pricing: Free plan; best for free CI/CD and API simulation workflows.
At a glance
- Editor score6.9 / 10
- PricingFree plan
- Best forFree CI/CD and API simulation workflows
- Free planYes
- Paid fromFree
- Facts checked21 Sep 2026
Where it wins
- Simulates API errors, throttling, latency, and predefined responses
- Runs across Windows, macOS, Linux, browsers, automated tests, and CI/CD
- Offers plugins, custom plugins, and a web API for programmatic control
Where it doesn't
- No breakpoint rules for proxy-specific traffic control
- No traffic replay or WebSocket inspection
- No proxy chaining support
Our verdict on Microsoft Dev Proxy
Microsoft Dev Proxy is a free, open-source command-line forward proxy for developers working with applications that call APIs. It runs locally on Windows, macOS, and Linux, with browser-specific proxy use for web testing. Teams can intercept and modify HTTP and HTTPS requests and responses, record traffic for analysis, and simulate API behavior without changing application code. That makes it a practical fit for local development, automated tests, API simulation, and CI/CD workflows.
Its strongest area is controlled API behavior. Dev Proxy can return predefined mock responses and simulate errors, throttling, and latency, helping teams exercise failure paths and slow-network conditions before deployment. The plugin model extends that control: configurable and custom plugins can inspect, analyze, modify, or replace requests and responses. A web API also supports programmatic control, which suits repeatable automation and pipeline-driven workflows rather than only interactive debugging.
The trade-off is focus. Dev Proxy covers interception, response mocking, fault simulation, recording, plugins, and CI/CD, but it does not provide breakpoint rules, traffic replay, WebSocket inspection, or proxy chaining. Its command-line design and automation support favor developers and teams that need programmable API conditions across environments. Choose it for free, open-source simulation and pipeline integration; choose another web debugging proxy when interactive breakpoints, replay, WebSocket analysis, or multi-proxy routing are central requirements.
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Microsoft Dev Proxy pricing
Microsoft Dev Proxy fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Free |
| Platforms | Not verified |
| Request/response editing | Yes |
| Breakpoint rules | No |
| Traffic replay | No |
| Response mocking | Yes |
| WebSocket inspection | No |
| Proxy chaining | No |
| Deployment | Desktop |
| Platforms | Windows, macOS, Linux |
| Support | Docs, Community |
| Built for | Small business, Mid-market, Enterprise (editorial estimate) |
| Pricing | Free plan |
| Website | learn.microsoft.com |
| Facts checked | 21 Sep 2026 |
Alternatives to Microsoft Dev Proxy
- mitmproxyA broad, programmable proxy for debugging HTTP, HTTPS, WebSockets, and related traffic.9.4
- FluxzyA broad debugging proxy with a capable free personal tier and €49 perpetual Pro access.9.3
- HTTP ToolkitA broad HTTP debugging proxy for teams working across browsers, apps, containers, and APIs.9.2
See all Microsoft Dev Proxy alternatives →
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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