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Vercel Edge Function Timeout — Serverless Execution Time Limit Exceeded

Warning5xx server error

Overview

Fix Vercel edge function and serverless function timeout errors when functions exceed execution time limits on Hobby or Pro plans.

Key Details

  • Vercel Hobby plan limits serverless functions to 10 seconds and edge functions to 25 seconds
  • Vercel Pro plan allows up to 60 seconds for serverless and 25 seconds for edge functions
  • Edge functions run on Cloudflare Workers runtime with limited APIs compared to Node.js serverless functions
  • Timeout errors appear as FUNCTION_INVOCATION_TIMEOUT in Vercel deployment logs
  • The timeout includes cold start time, so infrequently called functions may timeout more often

Common Causes

  • Serverless function performing a slow database query or external API call
  • Cold start latency consuming a significant portion of the timeout budget
  • Function attempting to process too much data in a single invocation
  • Edge function using a Node.js API not available in the edge runtime

Steps

  1. 1Move long-running operations to background jobs using Vercel Cron or external queue services
  2. 2Optimize database queries and add connection pooling (use Vercel Postgres connection pooling)
  3. 3Reduce cold start time by minimizing function bundle size and avoiding heavy dependencies
  4. 4Split large operations into smaller chunks and use streaming responses where possible
  5. 5Consider upgrading from Hobby to Pro plan for increased timeout limits (10s to 60s for serverless)

Tags

verceledge-functiontimeoutserverlesscold-start

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Frequently Asked Questions

Edge functions run on Cloudflare's edge network with 25s timeout and limited Node.js APIs. Serverless functions run on AWS Lambda with 10-60s timeout and full Node.js support. Edge functions have faster cold starts.