API Mocking for Every Workflow

Frontend teams often face a common bottleneck: waiting for backend APIs to be ready before they can build and test their user interfaces. This dependency creates delays, blocks parallel development, and makes it difficult to iterate quickly on designs.

With Mockd, frontend developers can start building immediately by creating mock endpoints that mirror the expected API contracts. Define the response shapes, error states, and edge cases you need to test, then build your UI against these mocks. When the real backend is ready, simply switch the endpoint URL.

Beyond basic development, mocking enables comprehensive testing of error handling, loading states, and edge cases that would be difficult or impossible to trigger with real backends. Need to test what happens when the API returns a 503? Or when a field is unexpectedly null? Mocks make these scenarios trivial to reproduce.

Developing in a microservices architecture presents unique challenges. Your service might depend on five, ten, or even dozens of other services. Running all of them locally is impractical - it consumes resources, requires complex setup, and creates a maintenance burden.

Mockd enables service isolation by mocking all dependencies. Define the contracts your service expects, create mocks that fulfill those contracts, and develop in isolation. Test how your service behaves when dependencies are slow, unavailable, or return unexpected data.

For chaos engineering, Mockd's fault injection capabilities let you simulate realistic failure scenarios. Add random latency, inject errors at specific rates, or simulate partial outages. Build confidence that your service handles failures gracefully before they happen in production.

Enterprise environments often involve legacy systems that are difficult to replicate in development. SOAP/XML services from decades-old systems, mainframe integrations, and partner APIs with strict security requirements create barriers to effective testing.

Mockd supports enterprise protocols including SOAP/XML web services and gRPC microservices. Mock legacy SOAP endpoints complete with WSDL validation, or create gRPC mocks directly from your .proto files. No need to maintain separate tooling for each protocol.

For security-sensitive scenarios, Mockd provides mTLS (mutual TLS) authentication. Configure client certificate requirements, match requests based on certificate fields, and ensure your security testing is comprehensive. Meet compliance requirements with detailed audit logging to file, stdout, or external systems like Splunk.

Sharing mock APIs with remote teammates typically requires deploying to a staging server, setting up cloud infrastructure, or maintaining a shared development environment. This adds friction to the development process and creates delays when iterating on API designs.

Mockd's cloud tunnel eliminates this overhead. Any team member can share their local mock server with a public URL by running a single command. Remote teammates, QA engineers, and stakeholders can access the mocks immediately without any deployment step.

For paid tiers, tunnel authentication (token, basic auth, or IP allowlisting) ensures that only authorized users can access your shared mocks. Custom subdomains on Team and Enterprise plans provide stable, memorable URLs for ongoing collaboration.

The best APIs are designed before they're built. But traditional development often inverts this - backends are built first, and frontends adapt to whatever API emerges. This leads to awkward interfaces, unnecessary round trips, and poor developer experience.

Mockd enables true design-first development. Define your API contract as mock configurations, share them with consumers for feedback, iterate on the design, and validate that the interface meets everyone's needs before writing a line of backend code.

For API consumers, early access to mocks means they can start integration work immediately. Share mock configurations via your repository, publish mock servers for partners to test against, and catch contract mismatches before they become production incidents.