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Functions

You can configure Vercel functions in many ways, including the runtime, region, maximum duration, and memory.


Configuring Functions

With Vercel, you can configure the runtime of a function in any of the following ways:

Configuring Functions

With different configurations, particularly the runtime configuration, there are a number of trade-offs and limits that you should be aware of. For more information, see the runtimes comparison.

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The runtime you select for your function determines the infrastructure, APIs, and other abilities of your function.

  • Node.js: When working with a TypeScript or JavaScript function, you can use the Node.js runtime by setting a config option within the function. For more information, see the runtimes.
  • Ruby, Python, Go: These have similar functionality and limitations as Node.js functions. The configuration for these runtimes gets based on the file extension.
  • Community runtimes: You can specify any other runtime, by using the functions property in your vercel.json file.

See choosing a runtime for more information.

Region

Your function should execute in a location close to your data source. This minimizes latency, or delay, thereby enhancing your app's performance. How you configure your function's region, depends on the runtime used.

See configuring a function's region for more information.

Maximum duration

The maximum duration for your function defines how long a function can run for, allowing for more predictable billing.


Memory

Last updated July 1, 2026

See configuring a function's duration for more information.

Vercel Functions have a default duration that's dependent on your plan, but you can configure this as needed, up to your plan's limit.

Cross-link map: Configuring Functions (/docs/functions/configuring-functions)From the Vercel docs graph (built 2026-09-21T05:26:59.511Z), spanning vercel.com docs + KB, nextjs.org, ai-sdk.dev, and other Vercel documentation sites. Full graph as JSON: https://vercel.com/docs/graph.jsonSemantically closest pagesConfiguring the Runtime for Vercel Functions — Learn how to configure the runtime for Vercel Functions.Runtimes — Runtimes transform your source code into Functions, which are served by our CDN. Learn about the official runtimes suppoConfiguring regions for Vercel Functions — Learn how to configure regions for Vercel Functions.Configuring Memory and CPU for Vercel Functions — Learn how to set the memory / CPU of a Vercel Function.Vercel Functions — Build API routes, webhooks, and agent request handlers with Vercel Functions, then test and debug them with Vercel CLI.This page links to (6)Configuring Maximum Duration for Vercel Functions — Learn how to set the maximum duration of a Vercel Function.Configuring Memory and CPU for Vercel Functions — Learn how to set the memory / CPU of a Vercel Function.Configuring regions for Vercel Functions — Learn how to configure regions for Vercel Functions.Vercel Functions Limits — Learn about the limits and restrictions of using Vercel Functions.Runtimes — Runtimes transform your source code into Functions, which are served by our CDN. Learn about the official runtimes suppoStatic Configuration with vercel.json — Learn how to use vercel.json to configure and override the default behavior of Vercel from within your project.Pages that link here (7)By site: vercel-docs (7)Fluid compute — Learn about fluid compute, an execution model for Vercel Functions that provides a more flexible and efficient way to ruVercel Functions — Build API routes, webhooks, and agent request handlers with Vercel Functions, then test and debug them with Vercel CLI.Advanced Configuration — Learn how to add utility files to the /api directory, and bundle Vercel Functions.Debugging slow Vercel Functions — Diagnose and fix slow Vercel Functions using CLI tools, logs, and timing analysis.Functions API Reference — Learn about available APIs when working with Vercel Functions.Getting started with Vercel Functions — Build your first Vercel Function in a few steps.Project settings — Use the project settings, to configure custom domains, environment variables, Git, integrations, deployment protection,

Vercel Functions use an infrastructure that allows you to adjust the memory size.

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Runtimes

See configuring a function's memory for more information.

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