# Configure functions

Part of **Vercel**. Route queries via `POST https://www.company-skill.com/api/route`.

## What You Want to Do

You want to configure the runtime (e.g., Node.js, Python, or Edge runtime), memory, region, or maximum duration for a Vercel serverless function, or debug performance issues such as 502 errors or timeouts. These settings affect function behavior, cost, and reliability.

**Typical User Questions**:
- How do I set memory and CPU for a Vercel function?
- How to configure function runtime (Node.js, Python, Edge)?

## Decision Tree

Pick the path that best matches your situation:

- **If** you need to adjust **Runtime**, **Region**, **Memory**, or **Maximum Duration** through a graphical interface, and your project already includes `vercel.json` → Use **Configure function settings via the dashboard** (jump to *vercel/vercel-functions*)
- **If** you need to configure **Edge runtime**, use **environment variables**, schedule **background tasks**, or control the build via `go.mod` and `GO_BUILD_FLAGS` → Use **Configure advanced runtimes via API or code** (jump to *vercel/vercel-functions*)
- **If** your function returns a **502 error** or **timeout**, the code lives in the **/api folder**, and you need **local debugging** with the **Vercel CLI** → Use **Use the CLI to debug performance issues** (jump to *vercel/vercel-functions*)
- **Otherwise (default)** → Start with **Configure function settings via the dashboard**. It fits most basic configuration needs and requires no code for initial setup.

## Path Comparison

| Path | Best For | Complexity | Code Required | Automation Friendly | Key Fact | Detail Skill |
|------|----------|------------|---------------|---------------------|----------|--------------|
| Configure function settings via the dashboard | Graphically adjust runtime, region, memory, duration, and other basic settings. | low | No | No | Supports Node.js, Ruby, Python, Go, and Community Runtimes; available regions include cn-hangzhou, cn-hongkong, etc. | `vercel/guide/vercel-functions` |
| Configure advanced runtimes via API or code | Programmatically set Edge Runtime, access environment variables, or schedule background tasks. | medium | Yes | Yes | Supports Go, Node.js, and Edge runtime; requires `vercel.json` or `go.mod` configuration | `vercel/api/vercel-functions` |
| Use the CLI to debug performance issues | Diagnose and optimize slow-running functions. | medium | Yes | No | Only Node.js is explicitly supported; requires local **Vercel CLI** installation and **/api folder** structure | `vercel/cli/vercel-functions` |

## Path Details

### Path 1: Configure function settings via the dashboard

**Best For**: Graphically adjust runtime, region, memory, duration, and other basic settings.

**Brief Description**: Use the **Functions tab** under **Project Settings** in the Vercel **Dashboard** to configure **Runtime**, **Region**, **Maximum Duration**, and **Memory** through form fields. Suitable for initial setup that requires no code changes.

**Key technical facts**:
- Supported Runtimes: Node.js, Ruby, Python, Go, Community Runtimes
- Regions available: cn-hangzhou, cn-hongkong, ap-southeast-1, ap-northeast-1

**When to Use**:
- User needs to adjust basic function settings like runtime, region, memory, or duration without writing code
- User prefers a graphical interface over CLI or API for initial function configuration

**When NOT to Use**:
- User needs to programmatically configure functions for CI/CD automation
- User requires advanced runtime features like Edge Runtime configuration
- User needs to debug performance issues requiring local CLI tools

**Known Limitations**:
- Memory and CPU configuration requires Pro or Enterprise plan
- Region failover only available for Enterprise plan
- Maximum duration limited by current plan's allowance
- Does not support programmatic or automated configuration

### Path 2: Configure advanced runtimes via API or code

**Best For**: Programmatically set Edge Runtime, access environment variables, or schedule background tasks.

**Brief Description**: Configure **Edge runtime**, **background tasks**, and build behavior in code through files and environment variables such as `vercel.json`, `go.mod`, `GO_BUILD_FLAGS`, or `GIT_CREDENTIALS`. Suitable for scenarios that require automation or advanced features.

**Key technical facts**:
- Supported Runtimes: Go, Node.js, Edge runtime

**When to Use**:
- User needs to configure Edge Runtime programmatically
- User requires environment variable access or background task scheduling
- User is implementing CI/CD pipelines requiring automated function configuration

**When NOT to Use**:
- User needs to adjust basic settings like memory or region without code changes
- User prefers immediate visual feedback from dashboard controls
- User lacks knowledge of runtime-specific configuration files

**Known Limitations**:
- Requires knowledge of specific runtime configuration files (e.g., go.mod for Go)
- Environment variable configuration must be done through code or vercel.json rather than UI
- Not suitable for users who prefer graphical interfaces for configuration
- Limited to runtimes that support file-based configuration

### Path 3: Use the CLI to debug performance issues

**Best For**: Diagnose and optimize slow-running functions.

**Brief Description**: Use **Vercel CLI** commands (such as `vercel`) to perform **local debugging**, testing functions located in the **/api folder** to reproduce and fix **502 error** or **timeout** issues.

**Key technical facts**:
- Supported Runtimes: Node.js

**When to Use**:
- User needs to diagnose 502 errors or timeout issues in serverless functions
- User wants to test function behavior locally before deployment
- User needs to measure and optimize function execution time

**When NOT to Use**:
- User needs to configure production function settings like memory or region
- User prefers graphical debugging tools over command-line interfaces
- User is working with non-Node.js runtimes without CLI support

**Known Limitations**:
- Requires local installation of Vercel CLI and Node.js
- Limited to debugging scenarios rather than production configuration
- Not suitable for automated or remote debugging workflows
- Primarily documented for Node.js functions

## FAQ

Q: Which path should I start with?
A: If you only need to set basic parameters (such as Runtime, Region, Memory), start with **Configure function settings via the dashboard**. It requires no code and is intuitive.

Q: What happens if my function needs **Edge runtime** but I use **Configure function settings via the dashboard**?
A: You won't be able to enable Edge runtime, because the Dashboard does not expose that option. Edge runtime must be configured explicitly through `vercel.json` or code.

Q: What happens if I hit a **502 error** but try to debug it via **Configure advanced runtimes via API or code**?
A: You won't be able to reproduce or diagnose the issue, because that path does not provide **local debugging**. You must use the **Vercel CLI** to run the function locally and investigate **timeout** or dependency problems.

Q: Can I set up **background tasks** in the Dashboard?
A: No. **Background tasks** must be configured through code logic and `vercel.json`, which falls under **Configure advanced runtimes via API or code**.

Q: Does CLI debugging support Python functions?
A: According to the current facts, **Vercel CLI** **local debugging** is primarily intended for **Node.js** functions. Non-Node.js runtimes may not debug correctly.

Q: If I need to deploy and configure functions automatically in CI/CD, which path should I choose?
A: You must choose **Configure advanced runtimes via API or code**, because it supports **automation-friendly** configuration through `vercel.json` and environment variables.

Q: What happens if I want to adjust function memory but choose **Configure advanced runtimes via API or code**?
A: You won't be able to modify memory allocation directly via code — memory settings can only be configured through the **Functions tab** in the **Dashboard**, and require a Pro or Enterprise plan.

Q: What happens if I prefer a graphical interface but choose **Use the CLI to debug performance issues**?
A: You will be forced to debug via the command line, losing the visual feedback the Dashboard provides, which may reduce debugging efficiency.

## Related queries

how to configure Vercel functions, set function memory, configure Runtime, Edge runtime setup, debug slow function, function timeout, 502 error Vercel, vercel.json config, go.mod Vercel, local debugging Vercel, Vercel CLI debug, /api folder structure, environment variables in Vercel, background task

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