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Error library

Next.js prerender error during build

next build failed while prerendering a page, usually because the page throws during render: missing env vars or data at build time, props assumed to exist, or browser-only code. Find the page in the build log and make it render safely at build time or render it dynamically.

Cause: A page throws during build-time rendering.

How to fix it

  1. Find the page path in the build log.
  2. Make sure env vars and APIs the page needs are available during the build.
  3. Guard against missing data/props.
  4. If the page depends on request data, render it dynamically instead of statically.

Example

Illustrative example, not from a customer project.

- const title = data.post.title
+ const title = data?.post?.title ?? 'Untitled'

FAQ

Why does it work in dev?

Dev renders on demand; build prerenders every static page up front.

Non-page files in pages/?

Next.js docs list stray non-page files in pages/ as a cause.

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