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OpenAPI Mock Server

CI Scrutinizer Code Quality Code Coverage GitHub release (latest by date)

OpenAPI API mock server with random data generation by specified schemas.

  • OpenAPI 3.x support.
  • Load specification from a local file or URL.
  • JSON and YAML format supported.
  • Generates fake response data by provided schemas or by examples.
  • Content negotiation by Accept header.
  • Can be used as standalone application (Linux and Windows) or can be run via Docker container.

Supported features

Feature Support status
generating xml response basic support (without xml tags)
generating json response supported
generation of basic types supported
generation of enums supported
generation of associative arrays supported
generation of combined types supported (without tag not and discriminator)
local reference resolving supported
remote reference resolving not supported
URL reference resolving not supported
validating request data not supported
force using custom response schema not supported (schema detected automatically)

Quick start

Download latest binary and run a server.

# runs a local server on port 8080
./openapi-mock serve --specification-url

# to test that the server successfully ran
curl 'http://localhost:8080/v1/pets'

Alternatively, you can use Docker image.

# downloads an image
docker pull muonsoft/openapi-mock

# runs a docker container with exported port 8080
docker run -p 8080:8080 -e "OPENAPI_MOCK_SPECIFICATION_URL=" --rm muonsoft/openapi-mock

# to test that the server successfully ran
curl 'http://localhost:8080/v1/pets'

Also, you can use Docker Compose. Example of docker-compose.yml

version: '3.0'

    container_name: openapi_mock
    image: muonsoft/openapi-mock
      - "8080:8080"

To start up a container run command.

docker-compose up -d

Usage guide


This project is licensed under the MIT License - see the LICENSE file for details.