Hoppscotch

Hoppscotch is an open-source API development and testing platform that lets developers build, test, and document HTTP, GraphQL, WebSocket, and other API requests directly from a fast, lightweight browser interface, positioning itself as a leaner alternative to heavier desktop API clients. Requests can be organized into collections and environments, with variables for things like base URLs and auth tokens that switch cleanly between development, staging, and production without editing every request by hand. Because it's open-source, teams can self-host Hoppscotch on their own infrastructure for full control over where API credentials and request history are stored, which matters for teams working with sensitive internal APIs who don't want request data leaving their own network. Its real-time collaboration features let a team share collections and work on the same set of API requests together, and built-in code generation produces ready-to-use request snippets in many programming languages so a tested API call can be dropped directly into application code. Hoppscotch also supports API documentation generation directly from collections, letting teams keep documentation in sync with the actual requests being tested rather than maintaining a separate, often-stale documentation file. It's popular with developers and small teams who want a fast, free, open-source tool for everyday API testing and don't need the heavier feature set of larger commercial API platforms.