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OpenAPI Server

On the record

Additional features
It supports serving static files, HTTP and HTTPS, watch mode, and custom Express middleware.github.com · read 5 Oct 2026
Configuration
Configuration is available through command-line options, environment variables, and environment files.github.com · read 5 Oct 2026
Default behavior
Mocks are enabled by default and take precedence over proxying when a matching mock exists.github.com · read 4 Oct 2026
End-to-end testing
Mocks can provide predictable API responses for end-to-end tests.github.com · read 4 Oct 2026
Install
The README instructs users to install it from its GitHub repository with npm.github.com · read 4 Oct 2026
Installation
The README gives a GitHub-based npm install command and a quick start that serves the API at localhost:3000/api.github.com · read 5 Oct 2026
Integration
The project can run as a command-line server or be imported programmatically as an application or Express router.github.com · read 5 Oct 2026
Intended use
The README describes using it to mock services while prototyping a single-page application without a working backend.github.com · read 4 Oct 2026
License
The package declares the ISC license.github.com · read 5 Oct 2026
Maker location
The Intesys GitHub organization profile lists Italy as its location.github.com · read 4 Oct 2026
Mock formats
Mocks can be JSON files, JavaScript modules, or Express middleware.github.com · read 4 Oct 2026
Mocking
Mocks can be JSON files, JavaScript modules, or Express middleware, and mocks are enabled by default.github.com · read 5 Oct 2026
Multiple specifications
It supports multiple specification files and directories and checks paths and methods for conflicts.github.com · read 4 Oct 2026
Notable limits
JavaScript mocks must run at runtime; the README says TypeScript mock files are not allowed because they cannot be transpiled at runtime.github.com · read 4 Oct 2026
OpenAPI support
It validates OpenAPI version 3 and Swagger version 2 specifications in YAML format.github.com · read 5 Oct 2026
Other features
The README lists a static file server, HTTP and HTTPS support, watch mode, and configuration through environment variables, files, or CLI parameters.github.com · read 4 Oct 2026
Proxy
When proxying is enabled, valid requests without a matching mock are forwarded to the configured backend.github.com · read 5 Oct 2026
Proxy and validation
It can proxy requests to another server and optionally validate responses.github.com · read 4 Oct 2026

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