OpenAPI Mock

Windows · Linux · Self-hosted

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Freedom report

One barScore 5.5

Free tierNo free tier on record
Open codeNo open-source code on record
Runs widely2 of 6 device platforms
DocumentedPlans, terms and facts published

OpenAPI Mock is ranked #13 of 27 in API mocking tools on Freedom251. It runs on Linux, Self-hosted, Windows.

Compared on API mocking tools

Dynamic responses: Yes
OpenAPI import: Yes
Mock data generation: Yes
Local deployment: Yes
Supported protocols: HTTP

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The record

Purpose: OpenAPI Mock is an API mock server that generates random response data from specified schemas.
OpenAPI support: The project states that it supports OpenAPI 3.x specifications in JSON and YAML formats.
Specification input: The server can load a specification from a local file or a URL.
Response generation: Mock responses can be generated from schemas or examples, and the configured strategy can ignore examples, use them when present, or use them exclusively.
Content negotiation: The server supports content negotiation using the Accept header.
Response formats: JSON responses are supported, while XML response generation has basic support without XML tags.
Deployment: The project can run as a standalone application on Linux or Windows, or in a Docker container; it also documents Docker Compose usage.
Configuration: Settings can be supplied through command-line options, environment variables, or YAML and JSON configuration files.
CI use: The documentation describes a validate command that can check whether a specification can be handled by the application, including for Continuous Integration.
Validation limit: The validate command reports only critical errors without details, and the documentation recommends another tool for a better specification-validation experience.
Reference limits: Remote and URL reference resolving, request-data validation, and forcing a custom response schema are listed as unsupported.
License: The project is licensed under the MIT License.
Maker identity: The repository is published under the GitHub account muonsoft; the repository page does not state a headquarters or founding date.
Container integration: The project documents use with Docker and Docker Compose.

Where it ranks on Freedom251

Best API Mocking Tools in 2026#13 of 27

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Sources

github.com/muonsoft/openapi-mock· checked 2 Oct 2026
github.com/muonsoft/openapi-mock/blob/master/docs/· checked 2 Oct 2026