knock

knock — fetch / XHR control inside Chrome DevTools

📖 Docs, screenshots, live demos: https://knock.racgoo.com

A DevTools panel that sits between your page and the network. Capture every fetch and XMLHttpRequest, rewrite them on the fly with rule pipelines, or pause a request and finish it by hand from an in-page floating editor.

Runs entirely in your browser. No account, no telemetry, no server.

— Capture every fetch / XHR with method, URL, status, headers, body. Detail pane shows the post-modify state.
— Rule pipelines rewrite outgoing requests (headers / query / body / cookies — Override or Replace) and synthesize responses (status / headers / body / delay / Set-Cookies). Rules run in order.
— Pause either side and edit live in a draggable in-page editor.
— Real cookies through chrome.cookies — actual jar state, not a fake header.
— Scenarios bundle rules with domain allowlists. Export / import as JSON.

→ Get started: https://knock.racgoo.com/docs/getting-started