Mokup Chrome Extension Lets Frontend Devs Mock APIs Directly in DevTools

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A developer has built Mokup, a Chrome DevTools extension that allows frontend developers to mock API responses without leaving the browser or setting up external tools. The extension captures live fetch and XHR requests in a dedicated DevTools panel, where users can create and edit mock rules with a single click. Mock rules and captured data are stored locally and never sent to any server, with the extension activating only when the DevTools panel is open. The free tier supports up to three mock rules, while a paid Pro license unlocks unlimited rules. Current limitations include no support for WebSocket, navigation requests, or binary response interception.

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