RESTless

AI-Powered API Mocking Platform

Stop waiting for backends. Instantly generate realistic mock APIs with AI-crafted payloads, network simulation, and live request inspection — built for developers creating apps for social good.

Healthcare APIsClimate DataDisaster ReliefFinTech Apps

Start your first project:

Or select an existing project from the sidebar ←

Your endpoints are live instantly at

https://restless-five.vercel.app/mock/[projectId]/[your-path]

No server setup. No deployment. Just define your endpoint and share the URL.

Everything you need

A complete API mocking toolkit powered by Google Gemini.

AI Payload Generation

Describe any API response in plain English — Gemini 2.5 Flash generates realistic JSON instantly.

Network Simulation

Configure per-endpoint latency, error rates, auth enforcement, and CORS — test real-world edge cases.

Instant Live URLs

Every endpoint is live immediately at /mock/[projectId]/[path] — no backend needed.

Faker.js Templates

Use {{faker.person.fullName()}} syntax for fresh, randomised data on every request.

Auth & CORS Controls

Simulate protected endpoints with custom auth headers and CORS policies per endpoint.

Real-Time Inspector

Live SSE feed of every incoming request — see headers, params, and body as they arrive.

How the mock engine works

Every request to your mock URL goes through a 7-step pipeline.

Route Match — Looks up endpoint by projectId, method, and path

Auth Gate — Returns 401 if auth is required and header is missing or invalid

CORS — Appends wildcard CORS headers if enabled for this endpoint

Latency — Delays the response by the configured latencyMs value

Error Simulation — Randomly returns a 5xx error at the configured error rate

Faker Processing — Interpolates {{faker.*}} template tokens with fresh values

Inspector + Response — Emits to real-time SSE bus, then returns the JSON payload

Built with modern tech

Next.js 16TypeScriptPostgreSQLPrisma ORMGoogle Gemini 2.5 FlashFaker.jsshadcn/uiTailwind CSS v4Server-Sent Events

Ready to mock?

Create a project, define your endpoints, and start building — no backend required.