Vercel Functions

Serverless compute layer for running backend logic without managing servers. Functions scale automatically with demand, handle API and database connections, and route through a global CDN for low latency. Optimized for I/O-bound workloads such as AI inference, webhooks, and data fetching.

Vercel Functions are deployed alongside frontend assets on the same platform, so full-stack apps deploy as a single unit. The fluid compute model allows concurrent execution within the same instance to reduce cold starts and improve cost efficiency compared to traditional function-per-invocation models.

Key capabilities:

• Multiple runtimes: Node.js, Bun, Python, Go, Rust, Ruby, Wasm, and Edge, plus community runtimes for Deno, PHP, and Bash
• Regional deployment with configurable data locality and optional failover across regions
• Framework integration with Next.js, SvelteKit, and others via file-based routing in api/ or framework conventions
• Streaming responses and support for long-running tasks such as AI generation
• Built-in integration with Vercel Storage, Edge Config, and cron jobs

Developers use Vercel Functions for API routes, authentication callbacks, form handlers, webhook endpoints, and server-side data fetching. The Web Request API and fetch handler align with standard web platform APIs, making it straightforward to migrate from other serverless providers or to colocate backend logic with frontend code.