Moqyy — API Mocking & Fetch/XHR Interceptor

Moqyy is the easiest way for frontend developers and QA testers to mock API responses and intercept network requests inside the browser. Mock APIs instantly, intercept **fetch** and **XMLHttpRequest (XHR)** calls, and test your frontend without waiting for backend endpoints. Moqyy is lightweight, fast, and built specifically for modern frontend workflows (React, Vue, Next.js, Angular). Key features • Intercept **fetch** and **XHR** calls. • Create API mock rules in one click. • Auto-fill request/response patterns and templates. • Save mock rules locally and import/export JSON. • Enable/Disable mocks globally or per-rule. • Capture real responses to use as a mock (Auto-capture). • Test different server responses (200, 400, 500, custom JSON). • Lightweight extension that won’t clutter your devtools. Who should use Moqyy • Frontend developers building UI without backend readiness. • QA teams testing client behavior for edge/backend error states. • Engineers who need fast, local API mocks without complex setup. Quick start 1. Install the extension. 2. Open the Network tab in Moqyy and trigger a fetch/XHR from your app. 3. Click the “+” next to a request to create a mock. 4. Edit the mock response and enable it — refresh your app and see the mocked response in action. Why Moqyy vs other tools • Focused on **API mocking** for frontend workflows (not a general network toolbox). • Simpler onboarding and a modern UI that developers prefer. • Built for speed — create useful mocks in under 30 seconds. If you find issues or want features, use the in-extension Feedback button — we read every message.