OpenAPI Mock Generator CLI

Overview

OpenAPI Mock Generator CLI is a Node.js-based tool designed to generate mock data from OpenAPI specifications. It simplifies the process of creating mock data for testing and development purposes, ensuring that developers can simulate the OpenAPI response as realistically as possible.

Features

• Mock Data Generation: Automatically generate mock data based on OpenAPI schemas.
• Support for Multiple OpenAPI Versions: Compatible with OpenAPI 2.0, 3.0, and beyond.

Prerequisites

• Node.js >= 22.x

Installation

To install the dependencies, use the following command:

1pnpm install

Optionally, install the CLI globally:

1pnpm add -g openapi-mock-generator-cli

Usage

Command Line Interface (CLI)

1. Place your OpenAPI specification files in the openapi/ directory or configure the path in the openapiMockGenerator.config.json file using the openApiFilesPath property.
   • The generator will look for OpenAPI files in the specified directory.
   • You can also specify the mock data output directory in the configuration file using outputSchemasPath property. The default output directory is mocks/.
2. Run the following command to generate mock data:

1#npm
2npx openapi-mock-generator-cli
3
4# pnpm
5pnpm dlx openapi-mock-generator-cli 

Or if you have installed in your project

1#npm
2npm run openapi-mock-generator-cli
3# pnpm
4pnpm openapi-mock-generator-cli

Supported Configuration File Names

The CLI will automatically look for a configuration file in your project root.
You can use any of the following names and formats:

JSON	YAML/YML	JavaScript/TypeScript
openapiMockGenerator.json	openapiMockGenerator.yaml	openapiMockGenerator.js
openapiMockGenerator.config.json	openapiMockGenerator.config.yaml	openapiMockGenerator.config.js
	openapiMockGenerator.yml	openapiMockGenerator.ts
	openapiMockGenerator.config.yml	openapiMockGenerator.config.ts

Tip: This flexibility allows you to choose the format that best fits your workflow or CI/CD pipeline.

Using @faker-js/faker for Mock Data

The OpenAPI Mock Generator supports the use of the @faker-js/faker library to generate realistic mock data. You can define custom mock data in your OpenAPI specification by using x-faker extensions.

Example

In your OpenAPI specification, add the x-faker extension to specify the Faker.js method for generating data:

1components:
2  schemas:
3    User:
4      type: object
5      properties:
6        id:
7          type: string
8          x-faker: datatype.uuid
9        name:
10          type: string
11          x-faker: name.findName
12        email:
13          type: string
14          x-faker: internet.email

How It Works

1. The generator reads the x-faker extensions in your OpenAPI specification.
2. It uses the specified Faker.js methods to generate mock data for the corresponding fields.
3. The mock server will return the generated data when the API is called.

Faker.js Documentation

For a full list of available Faker.js methods, refer to the @faker-js/faker documentation.

By leveraging @faker-js/faker, you can create more realistic and meaningful mock data for your APIs.

Project Structure

• src/: Contains the source code, including helpers and library modules.
  • helppers/: Utility functions for configuration, file handling, logging, and string manipulation.
  • lib/: Core logic for mock generation and OpenAPI reading.
• mocks/: Predefined mock schemas for testing.
• openapi/: OpenAPI specification files.
• coverage/: Code coverage reports.

Testing

Run the test suite using:

1pnpm test

License

This project is licensed under the Apache 2.0 License. See the LICENSE file for details.