microfn
Tiny, composable JavaScript functions. Deploy in seconds.
SubscriptionMCPContent Writing9,042 impressions#3 of its week
microfn lets you turn tiny JavaScript snippets into instantly callable cloud functions.
- for
- Developers and AI agents needing quick, reusable serverless functions.
- pricing
- freemium
Key features
- One-click deployment — Write a JS function and get a live HTTPS URL in seconds.
- MCP integration — Call functions from any MCP-connected AI agent.
- Multiple triggers — Invoke functions via webhook, email, schedule or Siri shortcuts.
- Function chaining — Compose functions together to build multi-step automations.
- Editable sandbox — Inspect and edit code in a built-in editor with full sandboxed execution.
- KV storage & secrets — Persist data and keep credentials secure for each function.
Use cases
- Send a Discord notification with weather data every morning.
- Expose a custom webhook that processes incoming data and forwards it via email.
- Create a reusable AI-generated utility that other agents can call on demand.
microfn vs alternatives
| Best for | Instant serverless JavaScript functions | Comprehensive MCP infrastructure | API-to-agent bridging | AI workflow scripting | YAML-driven MCP deployment |
|---|---|---|---|---|---|
| Pricing | Freemium | Subscription | Free | Free | Free |
| DevHunt upvotes | 3 | 29 | 8 | 40 | 20 |
| Launched | Nov 2025 | Jan 2026 | May 2026 | Oct 2025 | Aug 2026 |
- microfn vs Unified MCP Server: Provides a full MCP server with thousands of tools, while microfn focuses on single-function deployment.
- microfn vs MCP Bridge by Appfactor: Connects any API to an AI agent; microfn hosts custom JS functions as callable services.
- microfn vs Pipelex: Offers a declarative language for AI workflows; microfn offers concrete JavaScript functions.
- microfn vs gridctl: Manages multiple MCP endpoints via YAML; microfn provides a UI for individual functions.
microfn FAQ
How do I create a function?+
Write your JavaScript code in the editor and click save; microfn deploys it to a public HTTPS URL.
Can I trigger a function automatically?+
Yes, functions can be invoked via webhooks, email, scheduled cron jobs, or Siri shortcuts.
Is the code editable after deployment?+
All saved functions can be opened, inspected, and edited directly in the microfn editor.
What does MCP stand for?+
MCP is the Microfn Conversation Protocol that lets AI agents call your functions without leaving the chat.
Do I need a credit card for the Free plan?+
No, the Free plan does not require a credit card.
Are there limits on execution speed?+
Runtime and API rate limits still apply, but Pro removes daily execution caps.
Summarized by DevHunt from microfn.dev · Sep 28, 2026. Details may change; check the official site.