Network Interceptor

Network Interceptor gives developers full control over network requests directly in the browser. Set up rules to mock, redirect, block, delay, or modify requests — without touching your backend or configuring a proxy.

── RULE TYPES ──────────────────────────────────────────

Mock Return a custom response body and status code for any
fetch or XHR request.

Redirect JS Serve a local or alternate script in place of a remote JavaScript file.

── MATCHING OPTIONS ────────────────────────────────────

Match URLs by exact string, contains, wildcard (*), or full regex. Filter by HTTP method (GET, POST, PUT, DELETE, etc.) or match any.

── HOW IT WORKS ────────────────────────────────────────

Rules are applied in real time — no page reload required after toggling. A subtle on-page toast shows which rules fired and against which URL, so you always know what was intercepted.

── USE CASES ───────────────────────────────────────────

• Mock API responses during frontend development • Test error states (404, 500) without backend support • Simulate slow network conditions • Override feature flags or A/B test payloads • Strip or inject authentication headers • Redirect production API calls to a local dev server

No external servers. No data leaves your browser.