Voiden.md
Voiden.md is a developer tool that treats API design, testing, and documentation as code. By using a file-centric, Markdown-based approach, it allows developers to store API definitions in .void files directly within their Git repositories. It eliminates the need for external cloud-based API platforms by providing a local-first, version-controlled workspace that supports composable request blocks, making API workflows reviewable, branchable, and fully integrated into existing development pipelines.
Checked on Oct 19, 2026.
Alternative resources
Hoppscotch
An open-source API development ecosystem for testing, documenting, and managing REST, GraphQL, and WebSocket requests.
Bruno
A Git-native, local-first API client that stores collections as plain-text files directly within your project repository.
Mock Service Worker
API mocking library for JavaScript using Service Workers to intercept REST and GraphQL requests for testing and development.