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Why Am I Getting a Serverless Function Timed Out Error on My Vercel Deployed Express.js App?

Serverless function timeouts on Vercel with Express.js usually stem from prolonged processing within your API routes. Common causes include slow database queries, inefficient algorithms, large file uploads/downloads, or external API calls with delayed responses. Vercel imposes strict execution time limits for serverless functions (typically around 10 seconds), so exceeding this limit results in a timeout error. To resolve this, optimize your code by implementing database query indexing, using caching mechanisms, offloading computationally intensive tasks to background processes, optimizing image sizes and compression or increasing your timeout limit within Vercel's project settings if possible. Additionally, monitoring your function execution times with Vercel's analytics can pinpoint the slowest parts of your code that require attention.

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