Hoppscotch

Hoppscotch is an API development environment that runs in your web browser. You can test any API by sending requests and viewing the responses instantly. Unlike traditional tools, Hoppscotch is completely free and open-source, meaning anyone can use it or even contribute to improving it.

The platform supports various API types including REST, GraphQL, WebSocket, Socket.IO, MQTT, and Server-Sent Events. This makes it useful for testing modern real-time applications as well as standard web services. You can organize your API requests into collections, use environment variables for different setups, and write tests to check if APIs work correctly.

Hoppscotch offers both a free version with full features and an Organization plan for teams needing extra collaboration tools and support.

• Multi-protocol support (REST, GraphQL, WebSocket, MQTT, SSE)

• Real-time request and response testing

• Collections and workspaces for organization

• Environment variables and secret management

• Pre-request scripts and post-response tests

• Team collaboration with shared collections

• Code snippet generation for multiple languages

• Desktop app, web app, and CLI available

• Open-source and self-hostable

• Browser extension for CORS handling