Do I need to write code to use Mock API Builder?

No coding required! Simply define your data structure through our intuitive interface, and we generate realistic mock data automatically. You can also import OpenAPI specifications for instant setup.

Can I import my existing OpenAPI/Swagger specifications?

Yes! Mock API Builder supports both OpenAPI 3.0 and Swagger 2.0 specifications. Import your spec file and we'll automatically generate all endpoints with mock data.

Is Mock API Builder really free?

Yes, Mock API Builder is completely free forever. All core features are included with no credit card required, no hidden limits, and no premium tiers.

How do I share my mock API with my team?

Each mock API gets a unique shareable URL that you can distribute to your team. You can configure whether your API is public or requires authentication.

Does it support authentication and custom headers?

Yes! Mock API Builder supports API tokens, JWT authentication, custom headers, and CORS configuration for realistic API testing scenarios.

Does Mock API Builder require account registration?

No account needed to get started. Use Guest Mode to try all core features instantly — guest projects are available for 24 hours. Create a free account to save your projects permanently and manage them long-term.

How do I recover my account if I forget my password?

Use the "Forgot Password" link on the sign-in page. We'll send a reset link to your registered email address so you can regain access quickly.

All features included free

Powerful Features for Modern API Development

Everything you need to create, test, and deploy mock REST APIs. Build faster with instant mock data generation, OpenAPI import, and powerful collaboration tools.

100%

Free Forever

< 30s

API Setup Time

Core Features

99.9%

Uptime

Everything You Need

Comprehensive tools designed to accelerate your API development workflow

OpenAPI / Swagger Import

Import OpenAPI 3.0 and Swagger 2.0 specifications. Automatically generate mock endpoints from your API contracts in seconds.

Auto-generate endpoints
Support for both OpenAPI 3.0 & Swagger 2.0
Preserve schema definitions

Instant Mock Generation

Create working mock APIs without coding. Define fields and data types, and we generate realistic mock data automatically.

No coding required
Realistic data generation
Multiple data types supported

Easy Sharing & Collaboration

Share your mock APIs with team members via shareable links. Perfect for frontend developers awaiting backend APIs.

Generate shareable URLs
Public & private APIs
Team collaboration

Authentication Support

Built-in support for API tokens, JWT, and custom headers. Secure endpoints with email verification, and recover access via password reset.

API token support
JWT authentication
Custom headers

Request Logging & Analytics

View all requests and responses in real-time. Debug API issues with detailed request logs and response data.

Real-time request logs
Response inspection
Request history

CORS & Custom Headers

Configure CORS, custom headers, and response codes. Full control over API behavior and responses.

CORS configuration
Custom response headers
Status code control

Rate Limiting & Throttling

Test rate limiting scenarios. Simulate real-world API constraints without backend complexity.

Rate limit simulation
Request throttling
Realistic scenarios

Webhook Support

Configure webhooks to trigger external services. Test webhook integrations with mock data.

Webhook configuration
Event triggering
Integration testing

Guest Mode

Try Mock API Builder instantly without creating an account. Guest projects are available for 24 hours — create a free account to save them permanently.

No account required
Instant access
Save permanently with free account

Use Cases

Perfect For Every Team

Whether you're a solo developer or part of a large team, Mock API Builder fits your workflow

Frontend Development

Build and test your frontend applications without waiting for backend APIs to be ready.

Parallel developmentInstant feedbackNo backend dependencies

API Testing

Create comprehensive test scenarios with realistic mock data and edge cases.

Edge case testingAutomated testingCI/CD integration

API Prototyping

Design and validate API contracts before investing in backend implementation.

Quick iterationStakeholder demosContract validation

Why Choose Us

Mock API Builder vs Traditional Development

See how Mock API Builder accelerates your development process

Traditional Approach

Wait days for backend APIs
Manual mock data creation
Complex server setup
No collaboration tools
Expensive infrastructure
Limited testing scenarios

With Mock API Builder

Create APIs in seconds
Automatic realistic data
Zero infrastructure setup
Built-in team sharing
Completely free forever
Comprehensive test coverage

FAQ

Frequently Asked Questions

Get answers to common questions about Mock API Builder

Ready to Build Your First Mock API?

Join hundreds of developers who are already building faster with Mock API Builder. Start for free with no credit card required.

No credit card required • Setup in under 2 minutes • Free forever