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Node.js Runtime Support

3 posts · Jun 2019 – Oct 2025

What this trail covers

Vercel Functions now support multiple runtimes, including Node.js and Bun, offering increased concurrency, unified Web Standard API signatures, zero-config streaming responses, longer execution durations, faster cold starts, and automatic regional failover. Bun provides performance gains for CPU-bound and streaming workloads, while Node.js offers broad compatibility. The platform integrates with observability, logging, and monitoring infrastructure for both runtimes. Fluid compute with active CP

All Vercel trails
  1. Bun runtime on Vercel FunctionsIntroduces Bun as a new runtime option for Vercel Functions, available in Public Beta. Details how to configure Bun via `vercel.json` and provides examples for Next.js, Express, Hono, and Nitro. Presents benchmark results showing a 28% latency reduction for CPU-bound Next.js rendering workloads with Bun compared to Node.js, attributing gains to Bun's runtime architecture and optimized I/O and scheduling. Discusses performance characteristics and tradeoffs between Bun and Node.js, recommending testing dependencies before production migration.
  2. Node.js 10 is Now AvailableThis post announces the enablement of Node.js 10 support for new serverless Node.js functions and Next.js applications deployed on Vercel. It details how to upgrade by adding an `engines` field to `package.json` and lists the supported builders. It also highlights performance improvements in Node.js 10, such as faster `Array.reduce` and `Promise` operations, citing V8 6.6 performance metrics.