FakeJSON

Open your editor, send one request, and you’ve got a working stand-in for your API. FakeJSON lets you describe the payload you want right inside the request body, then echoes it back from a hosted endpoint—no local server to boot, no routes to wire up. Save these definitions as named resources so your team can reuse them across projects. Use the built-in JSON editor to shape objects, nest arrays, and add dynamic fields, or assemble quick HTML snippets that pull from the same placeholders.

For interface work and prototype spikes, swap between happy paths and failure states without touching your code. Tell FakeJSON to return successes, redirects, client mistakes, or server blowups; dial in artificial delay to stress spinners and retries; attach or strip headers to verify caching and auth flows. You can even add garbled text, truncated strings, or nulls to surface brittle logic. Because the response blueprint lives in the request, you can iterate fast in any tool—cURL, Postman, or your app—then pin stable versions as shared resources for teammates.

QA leads can centralize scenarios in one place. Organize smoke packs, track who changed what with version history, and gate edits with roles so only the right people can modify critical mocks. Use the developer portal and dashboard to watch traffic patterns, inspect payloads, and spot flaky clients. When preparing a release, throttle throughput to mimic peak usage or overseas latency, and flip on protective rules to see how your app behaves when upstream services rate-limit, drop connections, or send malformed headers. more