Stateful Mocking: WireMock Scenarios vs Spec-Based State
Quick answer: Many APIs are not pure request-response: the response to a second call depends on what the first call did, and a stateless mock that always returns the same
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mocking
Latency and Fault Injection: Mockoon vs OpenAPI Mock Config
Quick answer: A mock that only returns instant success cannot test how a client behaves when an API is slow, times out, or fails intermittently — and those paths are where
Read articleMocking Idempotency: Replaying the Same Key Should Return the Same Result
Quick answer: A mock that returns a fresh resource for every request cannot test the one behavior that makes payment and order APIs safe to retry: idempotency. Replaying the same
Read articleThe API Mocking Guide: Servers, Tools, and When to Use
Quick answer: API mocking stands in for a real service with a controllable stand-in that returns canned or spec-driven responses, so frontend, mobile, and integration work can proceed before the
Read articleYour saved API example keeps passing against the mock and fails against the live backend
The saved request in your API client and the recorded mock were hand-written once and never re-validated. The mock accepts the old payload and local replay stays green until the deployed backend rejects it. Derive examples from the spec, regenerate mocks on change, and validate before replay.
Read articleStop letting examples lie: make your OpenAPI spec the single source of truth for docs, mocks, and agents
The same example payload is usually hand-copied into docs, a mock server, a Postman collection, and test fixtures, and then they drift. OpenAPI examples can drive all four from one document, but only if they are realistic, schema-valid, and cover success, empty, and error states.
Read articleFrom a scanned spec to mocks, scenario tests, and an MCP server
A scanned document is only worth something if the team exercises it. Start a mock for blocked consumers, chain real scenario tests against staging, and serve the spec as an MCP server for internal agents.
Read articleThe best OpenAPI mock servers in 2026: four tools tested on one real spec
We pointed Prism, Microcks, Postman mock servers, and a local spec-driven workspace at the same OpenAPI 3.2 document, including an SSE stream. Here is what each handled, what cost money, and where examples quietly became lies.
Read articleThe backend was three weeks late. We shipped the frontend anyway.
A concrete sprint diary: one OpenAPI file drove a local mock with latency and error overrides, a four-step checkout scenario with an HTML report, live docs, derived database tables and a hosted MCP endpoint while the real API did not exist yet.
Read articleDon't block frontend work on a backend that isn't ready
Fake objects in components demo well and integrate badly. Agree on the coupon validation contract first, then let a spec-driven mock answer real HTTP while the service is still being built.
Read articleMocking APIs for frontend development: MSW vs Prism vs spec-driven mocks
MSW intercepts requests inside the browser and shines in component tests; Prism serves a spec over HTTP and validates contracts; spec-driven workspaces add journeys and streams. Here is where each belongs and how teams combine them without maintaining three sets of fixtures.
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