4 Open Source Alternatives To Postman

Hoppscotch is an open-source API development ecosystem designed to simplify and accelerate the process of testing and interacting with APIs. It provides a fast, user-friendly interface that serves as an alternative to other popular tools like Postman and Insomnia.

• User-Friendly Interface: Easily navigate and interact with APIs through an intuitive and responsive UI.
• Real-time API Testing: Test your APIs in real-time, ensuring they work as expected before deployment.
• Environment Management: Manage different environments and variables with ease, making it simple to switch contexts.
• Collaboration Tools: Share your API requests and responses with team members to enhance collaboration.
• Extensive Protocol Support: Supports REST, GraphQL, WebSocket, and other protocols, covering a wide range of API needs.
• Open Source: Fully open-source, allowing for community contributions and transparency in development.

Hoppscotch offers a comprehensive solution for API development, making it easier for developers to create, test, and share their APIs efficiently.

Kong Insomnia is a collaborative open-source API development platform designed to simplify the process of building high-quality APIs. It supports multiple protocols and provides a dev-friendly UI with built-in automation and an extensible plugin ecosystem, making API development efficient and enjoyable.

• Multi-protocol Support: Create, organize, share, and execute HTTP, REST, GraphQL, gRPC, SOAP, or WebSockets requests without app switching.
• Organizations and E2EE: Boost team collaboration with fully encrypted file and project synchronization across devices.
• Local Vault or Git Sync: Work entirely locally or push data governance and permissioning directly to your Git repository with native Git sync.
• Automatic Validation: Ensure consistency across designs with automatic linting of your OpenAPI specification as you type.
• API Mocking: Easily mock APIs to simulate endpoints for testing and development.
• Automated API Testing: Build tests and linting to improve reliability with native CLI and CI/CD integrations.
• Extensible Plugin Ecosystem: Extend workflows with over 350 open-source plugins, balancing capabilities and complexity.

Kong Insomnia offers a streamlined, developer-friendly workflow for designing, debugging, testing, and mocking APIs. It supports collaboration and innovation without the friction, making it the go-to tool for developers aiming to build elegant and reliable APIs.

Karate is a versatile open-source test automation framework that unifies API testing, mocks, performance testing, and UI automation into a single, easy-to-use platform. Its language-neutral syntax is accessible even to non-programmers, making it an ideal choice for diverse teams.

• API Testing: Write and execute tests for HTTP, JSON, GraphQL, and XML with simple, readable syntax.
• UI Automation: Automate web and mobile UI tests, integrating seamlessly with Appium and other tools.
• Mocks: Create and manage API mocks to simulate real-world scenarios and test interactions.
• Performance Testing: Use Karate's integration with Gatling to perform load and stress testing.
• Parallel Execution: Run tests in parallel to significantly reduce execution time.
• Rich Reporting: Generate detailed HTML reports with built-in assertions and logs for easy debugging.
• Standalone Executable: Use Karate without needing to compile code, ideal for teams not comfortable with Java.
• Java API: Programmatically integrate Karate’s automation capabilities into Java projects.

Karate simplifies the complexities of test automation by providing a comprehensive suite of tools and features in one unified framework.

Milkman is an extensible request/response workbench designed to help developers craft and organize their requests to any kind of technology. It provides a robust platform for managing and testing various types of requests with ease and efficiency.

• Extensible Architecture: Seamlessly integrate with various plugins and features, ensuring adaptability to different technologies.
• User-Friendly Interface: Offers both light and dark themes to suit your preferences, making the user experience pleasant and effective.
• Regular Updates: Stay up-to-date with new features and plugins that are regularly added to enhance functionality.
• Community Driven: Engage with a vibrant community that welcomes contributions, suggestions, and discussions to continually improve the tool.

Milkman is a versatile tool that evolves with your needs, making it an essential part of your development toolkit.