Browser extension
The FlowMock extension routes your browser's API calls through FlowMock and adds a FlowMock tab next to Network in DevTools. Pick any request, change what comes back, reload. Only your session sees it.
"Can we try FlowMock on the staging app?"
"Someone has to change the API URL and redeploy first."
"So… next sprint?"
Or: install the extension, open DevTools on the staging app you already use, and mock the first request before the coffee is done.
The page's API requests, labelled with what FlowMock did to each.
Turn FlowMock on for a site and the extension sends that site's API calls through your FlowMock environment. Your app keeps its real API URL. Teammates without the extension keep hitting staging as before, so you can try FlowMock on the app you test today.
In-product visual
FlowMock watches where the site's requests go and picks the environment whose API they call. Each site keeps its own environment, so staging, a preview deploy, and localhost can each point somewhere different. A site you never turned on is never touched.
In-product visual
Every API request the page makes is listed with its status, timing, and a label: Mocked, Transformed, Delayed, or Proxied. Click Mock and the editor opens with the real response filled in. Change the status, the JSON, or add a delay, and it's on for your session.
In-product visual
The Active view lists the running scenario and every mock and transform on for you, with how often each fired in the last ten minutes. Switch anything off from its row, clear everything at once, or turn on a mock or scenario from the team's library.
In-product visual
After a mocked response the page glows for ten minutes — or shows a side line, a ribbon, or a pill, your choice — and the toolbar badge counts the responses FlowMock changed on that tab. No more "why is checkout broken for me?"
In-product visual
The extension gets its own revocable credential, never your password or an org API key, and pages you test never see it. Apps that sign in with cookies stay signed in through FlowMock. Revoke any browser from your account settings.
In-product visual
| Browsers | Chrome and Firefox, desktop |
|---|---|
| Where it lives | A FlowMock tab in DevTools, plus a small button on pages you turned on |
| Scope | Only sites on your Sites list, each bound to one environment |
| Mocks you create | Drafts on your own session, editable in the dashboard |
| Reminders | Page glow, side line, ribbon, or pill · toolbar badge count |
| Price | Free forever for one person, on every plan |
Common objection
Yes, and nothing changes when you get there. The extension and the proxy URL use the same environments, mocks, scenarios, and transforms. Start in the browser today, point CI and the mobile build at the proxy URL when you're ready, and everything the team built keeps working.
Free plan, no card, two-minute setup.
