How to test WebSocket APIs with Hoppscotch?

Select the WebSocket protocol from the interface, enter the server URL, and establish a connection to send and receive messages in real-time. The tool logs all communications for debugging purposes.

Hoppscotch vs Postman: which is better for open-source projects?

Hoppscotch is fully open-source with self-hosting options, making it ideal for cost-control and data privacy, while Postman offers more integrations and a larger ecosystem but is proprietary. Choose Hoppscotch if open-source alignment is a priority.

Can Hoppscotch be used offline?

Yes, as a Progressive Web App, Hoppscotch supports offline usage with cached data and service workers. You can install it on your device for access without an internet connection.

How to write automated tests in Hoppscotch?

Use the post-request tests feature to write JavaScript code that validates status codes, headers, and response data. These tests execute after each request and can modify environment variables for dynamic workflows.

Does Hoppscotch support GraphQL subscriptions?

Hoppscotch supports GraphQL queries and mutations, but for real-time subscriptions, you may need to use WebSocket or SSE protocols separately, as GraphQL subscriptions aren't explicitly detailed in the core features.

How to fix CORS errors in Hoppscotch?

Enable Proxy Mode in settings to route requests through Hoppscotch's proxy server, which helps bypass CORS restrictions. Alternatively, use the official browser extensions for a similar effect without manual setup.

Is Hoppscotch free for commercial use?

Yes, Hoppscotch is licensed under MIT, allowing free use, modification, and distribution for commercial purposes, provided the license terms are followed, as stated in the README.

Open-Awesome

Hoppscotch

MITTypeScript2026.5.0Self-Hosted

An open-source API development ecosystem for testing HTTP, WebSocket, GraphQL, and other APIs with real-time collaboration.

Visit Website GitHub

79.5k stars5.9k forks0 contributors

What is Hoppscotch?

Hoppscotch is an open-source API development ecosystem that allows developers to test, debug, and collaborate on APIs across multiple protocols like HTTP, WebSocket, and GraphQL. It solves the need for a lightweight, fast, and extensible alternative to proprietary API clients, offering real-time collaboration and self-hosting options.

Target Audience

Developers, QA engineers, and API designers who need a versatile tool for testing and debugging APIs across various protocols, especially those working in teams or requiring offline/on-premise deployment.

Value Proposition

Developers choose Hoppscotch for its open-source nature, multi-protocol support, and robust collaboration features, all while being lightweight and fully self-hostable, providing control over data and infrastructure.

Overview

Open-Source API Development Ecosystem • https://hoppscotch.io • Offline, On-Prem & Cloud • Web, Desktop & CLI • Open-Source Alternative to Postman, Insomnia

Use Cases

Best For

Testing REST APIs with support for custom HTTP methods and authentication
Debugging real-time WebSocket, Socket.IO, or MQTT connections
Collaborating on API collections with team-based access controls
Self-hosting an API testing tool for security or compliance needs
Writing automated pre-request scripts and post-response tests
Working offline or in low-connectivity environments with PWA support

Not Ideal For

Teams requiring built-in API documentation generation and publishing features
Organizations needing advanced performance testing with load simulation and detailed analytics
Developers who prefer a fully no-code, GUI-driven workflow without any scripting requirements
Projects deeply integrated with specific cloud platforms that rely on native API management tools

Pros & Cons

Pros

Multi-Protocol Versatility

Supports HTTP, WebSocket, SSE, Socket.IO, MQTT, and GraphQL from a single interface, allowing comprehensive API testing without switching tools, as highlighted in the key features.

Real-Time Collaboration

Offers team workspaces with role-based access control and cloud sync, enabling seamless collaboration across devices, which is essential for distributed teams.

Extensive Automation Capabilities

Includes pre-request scripts and post-response tests in JavaScript, facilitating custom automation and validation for API workflows, as described in the features.

Cross-Platform Accessibility

Available as a PWA, desktop app, and CLI, ensuring flexibility and offline usage, which is emphasized in the cross-platform availability section.

Cons

Enterprise Feature Limitations

SSO support is marked as an enterprise edition feature, requiring self-hosting or paid plans for full organizational integration, as noted in the README footnote.

Self-Hosting Complexity

Setting up a self-hosted instance involves additional configuration and maintenance, as indicated in the documentation link, which can be daunting for some teams.

Proxy Dependency for CORS

To bypass CORS issues, users must enable proxy mode or use extensions, introducing potential privacy concerns and an extra layer, as mentioned in the proxy feature description.

Open Source Alternative To

Hoppscotch is an open-source alternative to the following products:

Insomnia

Insomnia is an open-source API client for designing, testing, and debugging REST, GraphQL, and other web APIs with a collaborative interface.

Postman

Postman is a collaboration platform for API development that allows developers to design, test, and document APIs.

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