Voiden API Client
Git-native. Modular. Made for devs who build.
FreeAPI302 impressions#1286 of its week
Voiden is an open-source, Git-native API client that lets you design, test and document APIs in plain Markdown files.
- for
- Developers who version-control APIs and need offline, code-centric tooling.
- pricing
- open source
- license
- Apache-2.0
- v2.3.1Voiden v2.3.115 days ago
- runner-v2.3.0voiden-runner runner-v2.3.019 days ago
- runner-v2.3.0-beta.22voiden-runner runner-v2.3.0-beta.2219 days ago
Key features
- Executable Markdown Docs — Run API requests directly inside Markdown alongside documentation and explanations.
- LEGO-style Request Blocks — Compose requests from reusable blocks (endpoint, headers, auth, params) that are version-controlled as text.
- Multi-Protocol Support — Test REST, WebSocket, gRPC and GraphQL APIs without leaving the tool.
- MCP Agent Integration — Expose requests as AI-agent callable tools and connect Claude, Codex or other MCP assistants.
- CI/CD Runner — Run .void files headlessly in Node.js environments like GitHub Actions or GitLab CI with deterministic exit codes.
- Advanced Auth & Scripts — Built-in OAuth, token, basic auth and pre/post request JavaScript, Python or Shell scripts.
- Rich Media & Format Previews — Preview PDFs, images, videos and handle XML, YAML, JSON payloads directly in responses.
- OpenAPI & Postman Import — Import OpenAPI specs or Postman collections to auto-generate .void files.
Use cases
- Version-controlled API design and testing stored alongside application code.
- Automated API testing in CI pipelines using voiden-runner.
- Turning API endpoints into AI-agent callable tools for Claude or Codex.
- Collaborative API documentation that lives in Git and is diffable.
- Migrating existing Postman collections or OpenAPI specs to a markdown-first workflow.
Voiden API Client vs alternatives
| Voiden API Client |  Postman |  Insomnia |  Bruno |  Firecamp | |
|---|---|---|---|---|---|
| Best for | Git-native, markdown-based API design & testing | Cloud-based API platform | Open-source API client | Git-friendly offline API client | OpenSource Postman clone |
| Pricing | Open source | Subscription | Free | Free | Free |
| DevHunt upvotes | 0 | 0 | 0 | 0 | 48 |
| Launched | Jan 2026 | — | — | — | Jan 2023 |
- Voiden API Client vs Postman: Traditional SaaS UI with cloud sync; Voiden is offline, Git-native markdown.
- Voiden API Client vs Insomnia: Open-source but UI-centric; Voiden focuses on text-based, versionable files.
- Voiden API Client vs Bruno: Offline-first and Git-friendly but lacks markdown execution and MCP integration.
- Voiden API Client vs Firecamp: OpenSource Postman alternative; Voiden adds markdown docs, CI runner and AI-agent support.
Voiden API Client FAQ
Why not just use curl or Postman?+
Voiden stores API definitions, tests and docs in plain Markdown files that are Git-native, offline and fully versionable, unlike proprietary tools.
Where does my data live?+
All data is saved in .void files inside your repository; there is no cloud storage or telemetry.
How does collaboration work?+
Since files are in Git, you collaborate via standard Git workflows—branching, pull requests and diffs.
Does Voiden support large specs (OpenAPI, Postman collections, etc.)?+
Yes, it can import OpenAPI schemas and both v2.0 and v2.1 Postman collections to generate .void files.
Is Voiden meant for teams or individuals?+
It works for both; the Git-native model scales from solo developers to teams using shared repositories.
Can Voiden turn API requests into MCP tools?+
Yes, you can mark a request with a /tool block and publish it via @voiden/mcp for AI agents to call.
Summarized by DevHunt from voiden.md · Oct 8, 2026. Details may change; check the official site.
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