Your API Mocking Tool for Agile Development

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🚀 Overview

Mokapi is an open-source tool that helps Agile, DevOps, and Continuous Deployment teams design, test, and validate APIs before implementation. It enables rapid prototyping of scenarios—like delayed responses, failures, or edge cases—without needing a live backend. By simulating real-world conditions early, Mokapi improves API quality and reduces the risk of bugs in production.

✨ Features

• Multiple Protocol support: HTTP, HTTPS, Apache Kafka, SMTP, LDAP
• Everything as Code: Reusing, version control, consistency and integrate mocks with your CI/CD.
• An embedded JavaScript engine to control everything - status, headers, delays, errors or other edge cases.
• Patch Configuration changes for mocking needs, rather than changing the original contract
• Multiple Provider support: File, HTTP, GIT, NPM to gather configurations and scripts.
• Dashboard to see what's going on.

🧩 OpenAPI & AsyncAPI Support

Mokapi supports mocking REST APIs using OpenAPI 2.0 / 3.0 / 3.1 and event-driven systems using AsyncAPI.

🔧 Spin Up Mokapi

Install and start Mokapi using one of the following methods. Replace the URL with your own OpenAPI or AsyncAPI specification.

Windows

choco install mokapi
mokapi https://petstore31.swagger.io/api/v31/openapi.json

MacOS

brew tap marle3003/tap 
brew install mokapi
mokapi https://petstore31.swagger.io/api/v31/openapi.json

Docker

docker run -p 80:80 -p 8080:8080 mokapi/mokapi:latest https://petstore31.swagger.io/api/v31/openapi.json

🎯 Hit Your First Mock

Once Mokapi is running, you can make requests to your mocked API like so:

curl http://localhost/api/v31/pet/2 -H 'Accept: application/json'

🧩 Customize Your Mock with JavaScript

Mokapi makes it simple to control responses using embedded JavaScript.

For example, you can dynamically change the response based on query parameters:

import { on } from 'mokapi';

export default function() {
    on('http', (request, response): boolean => {
        switch (request.path.petId) {
            case 2:
                response.data.name = 'Betty';
                return true;
            case 9:
                response.statusCode = 404;
        }
        return false;
    });
}

🖥️ Dashboard

Mokapi’s dashboard lets you visualize your mock APIs. View requests and responses in real-time, generate and validate sample data for testing.

🧪 Learn by Example

Explore tutorials that walk you through mocking different protocols and scenarios:

• 🌍 Get started with REST API
  This tutorial will show you how to mock a REST API using an OpenAPI specification.

• ⚡ Mocking Kafka with AsyncAPI
  Mocking a Kafka topic using Mokapi and verifying that a producer generates valid messages.

• 👨‍💻 Mocking LDAP Authentication
  Simulate LDAP-based login flows, including group-based permissions.

• 📧 Mocking SMTP Mail Servers
  Use Mokapi to simulate sending and receiving emails in Node.js apps.

• 🖥️ End-to-End Testing with Jest and GitHub Actions
  Integrate Mokapi into your CI pipeline for full-stack E2E testing.

More examples are available on mokapi.io/docs/resources

📚 Documentation

• Get Started
• HTTP
• Kafka
• LDAP
• SMTP
• Javascript API
• Resources

☕ Support

If you find Mokapi helpful, consider supporting the project:

📄 License

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