Mock any API in seconds. Free.
Beeceptor limits the free tier to 50 requests per day. mockapi.dog has no limits, no signup, and supports LLM streaming that Beeceptor does not offer.
- Deploy a mock endpoint in under 5 seconds - no account, no API key
- Simulate delays, errors, and LLM streaming responses out of the box
- Unlimited requests, unlimited endpoints, zero cost
Used by frontend developers, indie hackers, and startup teams shipping without waiting.
The Problem
You need a mock API. Maybe the backend team is two sprints behind. Maybe OpenAI's rate limits killed your demo prep. Maybe you just need a 500 response on demand to test error handling.
You open Beeceptor. It works - until you hit the 50 requests/day cap on the free tier. Now you're looking at $10/month for a paid plan. For a mock endpoint.
Or maybe you need to mock an LLM streaming endpoint for your AI chat feature. Beeceptor doesn't support Server-Sent Events or token streaming at all.
Scenario
A frontend developer building a dashboard needs three mock endpoints: two REST endpoints for product data and one streaming endpoint for an AI-powered search feature. She needs them working immediately, without request limits, and without paying for a subscription to a mocking tool.
The Solution
mockapi.dog gives you a live API endpoint in seconds. Open the page. Define your JSON response. Pick your HTTP method and status code. Click save. Your endpoint is live.
Need to simulate a slow server? Set a delay. Need to test error handling? Configure a failure rate. Building an AI chat interface? Create an LLM streaming endpoint that sends tokens over SSE, matching the OpenAI response format.
No account to create. No workspace to configure. No request caps. No daily limits. You get a URL. It works. You move on.
Feature Breakdown
Instant deployment
Click save and your endpoint is live. No build step, no deployment pipeline, no waiting. The URL works the moment you create it.
Any HTTP method, any status code
GET, POST, PUT, DELETE, PATCH, HEAD, OPTIONS. Return 200, 201, 400, 404, 500, or any status code you need. Full control over what your mock returns.
Delay and error simulation
Add artificial latency in milliseconds. Set a random error rate percentage. Configure conditional errors triggered by specific request headers. Test every failure mode.
LLM streaming responses
Mock OpenAI-compatible streaming endpoints. Tokens arrive over Server-Sent Events, just like the real API. Test your streaming UI without burning API credits.
Zero configuration
No package.json. No docker-compose.yml. No Postman collections. No Beeceptor subdomain setup. Open the browser and start.
CORS enabled by default
Every endpoint supports cross-origin requests. Your frontend app on localhost can call your mock endpoint without proxy configuration.
mockapi.dog vs Beeceptor
| Feature | mockapi.dog | Beeceptor |
|---|---|---|
| Setup time | Seconds | Seconds |
| Signup required | No (limited) | |
| Free tier limits | None | 50 req/day, 3 rules |
| LLM streaming (SSE) | ||
| Delay simulation | ||
| Error simulation | Random + conditional | |
| Stateful mocking | ||
| OpenAPI import | ||
| Request inspection | ||
| Proxy / record | ||
| Cost | Free, no limits | $0–$99/month |
| Focus | Mocking only | Mocking + virtualization |
Honest tradeoffs
mockapi.dog does not support OpenAPI import, request recording, stateful mocking, proxy passthrough, or CRUD routes. If you need a full API virtualization platform with traffic inspection and enterprise features, Beeceptor is a better fit. mockapi.dog is for developers who need a working mock endpoint fast, with no limits and no overhead.
Use Cases
Building a frontend without a backend
Your backend team is still designing the database schema. Create mock endpoints that return the exact JSON your components expect. Swap the URLs when the real API is ready.
Mocking OpenAI for UI development
You're building a streaming chat interface. Each OpenAI call costs money and has rate limits. Create an LLM streaming mock that sends tokens over SSE. Iterate on your UI for free.
Testing retry logic with server errors
Set up a mock endpoint with a 30% error rate. Verify that your retry mechanism, error toasts, and fallback states all work correctly without depending on an unstable backend.
Demoing a product to investors
You have a pitch meeting tomorrow. The API integration isn't finished. Create mock endpoints that return realistic data. Your demo works without depending on a staging server.
Developer Experience
5 seconds to first endpoint. Open mockapi.dog. Your shortcode is already generated. Type your JSON response. Click save. Done.
There is no onboarding wizard. No "create a workspace" step. No team invitation flow. No subdomain to configure.
It works in your browser. Chrome, Firefox, Safari - any modern browser on any operating system. No desktop app, no CLI, no Docker container.
You get a URL. You use it in your code. That is the entire workflow.
Pricing
Free. No limits. No signup.
No request caps. No endpoint limits. No premium tier. No "contact sales" button.
mockapi.dog is a free tool built by a solo developer for the developer community. It exists because mocking an API should not require a procurement process or a credit card.
Ready to start?
You need a mock API. Not a platform. Not a subscription. Open mockapi.dog. Create your endpoint. Get back to building.