# MockAPI Dog Documentation

Everything you need to create free mock REST APIs and LLM streaming endpoints

## What is MockAPI Dog?

MockAPI Dog is a free, instant mock API generator for both **REST APIs** and **LLM (AI) streaming endpoints**. Create custom endpoints that return exactly the data you need - no server code, no API keys, no signup required.

### Mock REST APIs

Create traditional REST API endpoints with custom JSON responses, HTTP methods, status codes, delays, and error simulation. Perfect for frontend development and testing.

[Read REST API Guide](/content/et/docs/mock-rest-api/index.html)

### Mock LLM APIs

Simulate OpenAI, Anthropic Claude, and other LLM streaming endpoints. Build AI features without spending thousands on API calls. Save big on development costs.

[Read LLM API Guide](/content/et/docs/mock-llm-api/index.html)

## Quick Start

### Create a REST API Endpoint

1. Visit [mockapi.dog](/content/et/index.html)
2. Select "REST API" tab
3. Choose HTTP method (GET, POST, etc.)
4. Write your JSON response
5. Save and get your unique endpoint URL

`GET https://abc123.mockapi.dog/api/users`

### Create an LLM Streaming Endpoint

1. Visit [mockapi.dog/llm-mock](/content/et/llm-mock/index.html)
2. Choose provider (OpenAI, Anthropic, etc.)
3. Configure content mode and tokens
4. Save and use in your AI app
5. Replace baseURL in your SDK

`baseURL: 'https://abc123.mockapi.dog/llm/openai'`

## Common Use Cases

#### Frontend Development

Build UIs while backend is in progress. Test with realistic data.

#### AI Development

Build chatbots and AI features without expensive API costs.

#### API Prototyping

Validate API designs before implementation. Get stakeholder feedback.

#### Testing & QA

Test error handling, edge cases, and loading states.

#### CI/CD Pipelines

Run automated tests without rate limits or API costs.

#### Learning & Teaching

Practice API integration without complex backend setup.

## Ready-to-Use Mock API Library

We provide pre-built mock APIs for common use cases. Perfect for learning, testing, or rapid prototyping. Explore categories like Users, Posts, Products, Auth, and more.

[Browse API Library](/content/et/docs/mock-rest-api#mock-api-library/index.html)

## Key Features

#### No Signup Required

Start creating endpoints instantly. No registration, no email verification.

#### Instant Deployment

Your endpoints are live immediately after saving. No build or deploy step.

#### Advanced Features

Add delays, error rates, conditional errors, and custom headers.

#### 100% Free

Unlimited endpoints, unlimited requests. No premium tiers or paywalls.

#### LLM Streaming

Mock OpenAI, Claude, and other AI providers. Real streaming responses.

#### Pre-built APIs

Access ready-to-use APIs for users, posts, products, and more.

### Ready to Start?

Choose your path below to learn how to create mock REST APIs or LLM streaming endpoints. Both are completely free and require no signup.

[REST API Guide →](/content/et/docs/mock-rest-api/index.html) [LLM API Guide →](/content/et/docs/mock-llm-api/index.html)