Question 1

What is next.config.js in Next.js and what are common configurations?

Accepted Answer

**Target Audience:** Frontend engineers preparing for Next.js interviews — assumes basic React and App Router familiarity.
**Difficulty:** Medium

> **How to read this doc:** Each idea is explained in plain language first, then tagged with `📌 Interview term:`. Every behaviour claim was checked against the Next.js docs shipped with the package (written on 16.3.4, re-reviewed against 16.4.2) and, in the **Verified** section, against real output from a build or a running server; each Verified bloc

Question 2

What is static export (output: 'export') in Next.js and what does it not support?

Accepted Answer

**Target Audience:** Developers preparing for Next.js interviews — assumes the basics of App Router rendering (static vs dynamic routes).
**Difficulty:** Medium

> **How to read this doc:** Each idea is explained in plain language first, then tagged with `📌 Interview term:`. Every behaviour claim was checked against the Next.js 16.4.2 docs shipped with the package and, in the **Verified** section, against lab builds with `output: "export"`, a plain static file server and a Chromium browser.

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NEXT.JSDECODED.

Medium

What is next.config.js in Next.js and what are common configurations?

What is static export (output: 'export') in Next.js and what does it not support?