voiden
Design, Test and Document APIs in plain Markdown. Compose Requests with API blocks. Reuse, Replace & Version everything just like code. Offline, Truly Git Native, No Lock-in.
Voiden is a Claude Code plugin that provides an offline, Git-native API workspace for designing, testing, and documenting APIs using plain Markdown files. It stores all API requests, tests, and documentation in executable `.void` files that can be versioned with Git and edited by AI agents. The plugin enables developers to work with REST, GraphQL, gRPC, and WebSocket APIs in a programmable interface with slash commands, while maintaining complete local control without cloud lock-in. Built on Electron, it offers a headless CLI runner for CI/CD integration and supports import from Postman, Insomnia, and OpenAPI formats.
Key Features
Use Cases
- 01API testing and development with version-controlled request collections managed through Git pull requests
- 02Collaborative API documentation that stays synchronized with executable test requests in the same file
- 03CI/CD pipeline integration using the headless Voiden Runner to validate API contracts automatically
- 04AI-assisted API development where agents can read and modify plain-text `.void` files directly
- 05Migration from Postman or Insomnia to a Git-native workflow with full collection import
- 06Local API testing during development without internet connectivity or cloud service dependencies
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voiden — FAQ
What is the Voiden Claude Code plugin?+
Voiden is an offline API workspace that integrates with Claude and Codex agents, allowing developers to design, test, and document APIs using plain-text `.void` files. It supports REST, GraphQL, gRPC, and WebSocket protocols, storing all work locally without requiring accounts or cloud sync.
How do I install Voiden?+
Download the installer for your platform (macOS, Windows, or Linux) from voiden.md/download. Alternatively, use package managers: `brew install voiden` on macOS, or APT/Snap on Linux. No signup or login is required after installation.
Which AI clients does Voiden work with?+
Voiden provides skills support for Claude and Codex agents, enabling these AI assistants to read and edit `.void` files directly. The plain-text format is designed to be AI-friendly, diffable, and greppable.
Do I need an API key to use Voiden?+
No API keys are required to use Voiden itself. However, your `.void` files may contain API requests that require authentication tokens or keys for the services you're testing, which you configure within each request block.
Is Voiden free to use?+
Yes, Voiden is open-source software licensed under Apache 2.0. The README states there is no VC funding, no telemetry, and no cloud lock-in, indicating it's freely available without subscription fees.
Can I import my existing Postman collections?+
Yes, Voiden supports importing collections from Postman (JSON v2.1), Insomnia, and Swagger/OpenAPI. Simply drag the exported JSON file into Voiden and click 'Generate Voiden Files' to convert your requests into native `.void` format with all headers, auth, params, and bodies preserved.
How do I install voiden?+
Open the source repository on GitHub and follow its README. voiden is a plugin — MCP Agents Market links you directly to the official repo.
Is voiden free?+
voiden is an open-source project hosted on GitHub. Check the repository for its license and any usage requirements.