Chrome DevTools network sampler and API mocker
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Syfen — Chrome DevTools Network Sampler & API Mocker
Syfen is a Chrome DevTools panel that lets you capture, save, and replay real API responses — without touching your backend or writing any mock servers.
What it does
Open the Syfen panel in DevTools, click Live, and it silently intercepts every fetch and XHR request your page makes. Pick any captured request, save it as a preset, then toggle it on to have Syfen serve that exact response the next time the same endpoint is called — complete with original headers, status codes, and response body.
Key features
Zero-config capture — no proxy, no browser flags, no code changes. Works on any page, any framework.
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