The Tool Desk
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What you need before you start
- An OpenAPI YAML or JSON description covering the paths and HTTP methods the screen uses, plus relevant parameters, request bodies, and response schemas.
- Node.js meeting Prism’s documented requirement: 18.20.1 or later, with a stated exception for Node.js 18.x requiring 18.16 or later. Check the current Prism project guidance before adopting the setup, because package requirements can change.
- A way to configure your frontend’s development API base URL, such as its existing environment variable or development proxy.
Start a local Prism mock
- Review the OpenAPI file. Confirm it describes the operations the frontend needs. For UI states that must be predictable, add response examples to the relevant operations. Prism uses examples when available and can generate values from schemas when examples are missing.
- Install the CLI. The Prism project documentation gives this global npm installation command:
npm install -g @stoplight/prism-cli - Run the mock against your spec. From a terminal, substitute the path to your file:
prism mock path/to/openapi.yaml
The Prism CLI guide shows the server listening athttp://127.0.0.1:4010and printing the operations it discovered. Use the address and port shown by your own process. - Point the frontend at that address. Set the API base URL using the project’s existing development configuration. Keep this setting separate from production configuration so the app does not accidentally ship with a local URL.
- Call a route and inspect the result. Use the frontend or an HTTP client such as curl to request an operation listed by Prism. Check the status, headers, and response body against what the screen expects. The CLI guide includes a local curl example.
Make mock responses useful for UI work
Write examples for important states
Schema-derived data is useful for exercising a route, but it may not represent the application-specific cases a screen needs. Add explicit examples for states such as an empty collection, a normal successful response, and an error response. Prism supports multiple named examples; in its documented setup, select one with a request header such as Prefer: example=empty, replacing empty with the example name in your specification. Include the expected response status code with the example: Prism’s guidance notes that validation or security behavior can affect the status and prevent an example from being selected.
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Use dynamic generation when appropriate
For responses that should vary rather than repeat authored example data, Prism documents dynamic mode through prism mock -d or a Prefer: dynamic=true request header. Use named examples when a UI state needs to be repeatable; use dynamic responses when variation is more useful than deterministic fixtures.
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Mock only the routes a screen needs
You do not have to treat the entire API as a finished product before unblocking one screen. Start with the operations that screen actually calls, make sure their request and response shapes are represented in the OpenAPI file, and add examples for the states the interface must render. Run the mock from that contract and direct the frontend to it. If the specification lacks an operation, parameters, or response details the UI relies on, improve the contract first; a mock cannot reliably supply behavior that is not described.
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Choose a tool based on the kind of mock you need
| Need | Starting point | What to assess |
|---|---|---|
| Generate routes from OpenAPI and validate requests against the description | Prism | Response generation, examples, content negotiation, validation, and CLI setup. |
| A configurable mock-server workflow | Mockoon | Environment setup, local behavior, CORS requirements, and how the team stores or shares configuration. |
| Load a local or remote spec and adjust straightforward server settings | OpenAPI Mock | Specification source, port, CORS, and response settings. Its documentation says CORS is configurable and disabled by default. |
| General HTTP stubs or broader request-matching behavior | WireMock | Standalone deployment, request matching, dynamic responses, and whether OpenAPI-derived behavior is necessary. |
These are documentation-based distinctions, not results of comparative hands-on testing. Choose according to how closely responses need to follow the OpenAPI contract, whether request validation matters, how much bespoke behavior the UI requires, and how the team wants to configure and share mocks. Prism is documented as an open-source, self-hosted CLI; the workflow does not require a paid tool.
Troubleshoot failed requests
The mock does not start or a route is missing
- Check that the spec path is correct and that the file describes the operation you are calling.
- Read Prism’s startup output for the discovered operations and the address it is listening on; use those details rather than assuming a route or port.
- Confirm the operation’s method and path match the frontend request.
The browser reports a CORS error
A browser cross-origin error is distinct from a missing route. First try the same request with curl: if it reaches the mock, inspect the browser’s network panel and configure CORS on the mock or use the frontend’s existing development proxy. OpenAPI Mock’s documentation describes a configurable CORS setting that is disabled by default.
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The response is unexpected or an example is not selected
- Check that the example is attached to the correct operation and response status code.
- Check the example name in the
Prefer: example=<name>header. - Review request validation and security requirements that might change the response status or affect which response example applies.
- If Prism is generating from a schema rather than an example, add an explicit example when the frontend needs a particular business state.
Keep the setup reproducible—and know what it cannot verify
Record the mock tool, spec path, local port, frontend base-URL setting, and any example-selection convention in the project README or package scripts. Recheck the tool’s current installation and version guidance when upgrading.
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