7 Next.js App Router Mistakes I See Most Often

Short summary

A list of seven common Next.js App Router mistakes including overusing useEffect for data fetching, declaring 'use client' too broadly, over-fetching data in components, and bloating Server Actions with business logic. The core principle is server-first with minimal client boundaries. The article is based on a previously published Medium post with minor expansions.

• •Default to server-side data fetching over useEffect
• •Keep client component boundaries as small as possible
• •Keep Server Actions thin: validate, call service, return result

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