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vercel-functions

Configure and optimize Vercel Functions across Node.js, Bun, Python, and container runtimes.

Updated Aug 21, 2025
Search Tags:#docker#vercel#serverless functions#websockets#edge runtime#fluid compute#maxduration
One-click install
npx skills add https://github.com/Adithiya-S/AI-Study-Companion --skill vercel-functions-adithiya-s
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: vercel-functions
Source: https://github.com/Adithiya-S/AI-Study-Companion/tree/main/.agents/skills/vercel-functions
Command: npx skills add https://github.com/Adithiya-S/AI-Study-Companion --skill vercel-functions-adithiya-s

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve? Serverless functions on Vercel fail in predictable ways — 504 timeouts, 250 MB bundle errors, 4.5 MB payload caps, and misconfigured Edge runtimes — and this Skill provides the expert guidance to configure, debug, and optimize them correctly. ## Core Features & Use Cases - Runtime Selection & Migration: Guides the choice between Node.js (default), Bun, Python, Rust, and container images, and migrates legacy Edge runtime code to Node.js on Fluid Compute. - Duration & Bundle Optimization: Configures maxDuration up to 1800s (30 min beta), enables 5 GB large functions via VERCEL_SUPPORT_LARGE_FUNCTIONS, and trims bundles with excludeFiles. - Docker & Streaming Support: Deploys OCI container images via Dockerfile.vercel and implements streaming, WebSockets, waitUntil background work, and graceful shutdown. - Use Case: Your API route times out at 300s while calling an LLM. Use this Skill to set per-function maxDuration to 1800s, stream heartbeats over HTTP/2, and stay within Active CPU pricing. ## Quick Start Ask the assistant to configure a Vercel Function that runs for 30 minutes and streams progress to the client.

Frequently Asked Questions about vercel-functions

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I increase the Vercel Function timeout beyond 300 seconds?▼

Set maxDuration in code (export const maxDuration = 800) or vercel.json per function. Pro and Enterprise support 800s generally available and 1800s via the extended-duration beta; Hobby is capped at 300s with no headroom.

Should I use the Edge runtime or Node.js for Vercel Functions?▼

Use Node.js, which is the default. Vercel recommends migrating off Edge, Next.js 16.3+ no longer supports it, and both runtimes share Fluid Compute regions and Active CPU pricing while Node.js offers full APIs and larger bundles.

How do I fix the 250 MB unzipped maximum size error on Vercel?▼

Enable large functions (5 GB bundles) by setting VERCEL_SUPPORT_LARGE_FUNCTIONS=1 and redeploying, which requires Fluid Compute. First trim the bundle with excludeFiles in vercel.json or outputFileTracingExcludes in Next.js.

Can I deploy a Docker container as a Vercel Function?▼

Yes. Add a Dockerfile.vercel or Containerfile.vercel at the project root and Vercel builds it into an autoscaling, scale-to-zero Function with Active CPU pricing. It is stateless serverless, not a long-lived server or VM.

Why does my Vercel Function return 413 FUNCTION_PAYLOAD_TOO_LARGE?▼

Request and response bodies are capped at 4.5 MB. For uploads, use Vercel Blob client uploads that bypass the function; for large responses, stream them since streamed responses are not subject to the limit.

Does Vercel support WebSockets in serverless functions?▼

Yes, Vercel Functions support WebSockets on the Node.js runtime with Fluid Compute. For long-lived bidirectional connections, stream heartbeats and consider duration limits, or use Vercel Workflow for durable execution.

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