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Incremental Static Regeneration (ISR) is an architectural approach for static site generators that enables selective, incremental regeneration of pre-rendered pages without full rebuilds. Pages are regenerated on demand and refreshed in CDN/edge caches. ISR balances latency, consistency and build cost. It is suited for content-heavy sites requiring frequent…
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Incremental Static Regeneration (ISR) pre-renders pages and refreshes individual pages when needed without rebuilding the entire site.
ISR emerged among static site generators as an answer to the tension between fast delivery and frequently changing content. Next.js popularized the term for a model in which pages are updated at build time or after a revalidation interval.
Imagine a shelf of prepared pages: visitors receive a finished page while a stale one is reprinted in the background. Responses stay fast without rolling a complete site build out for every content change.
HTML is generated before a request and can be served quickly.
A page is generated again after a time or event.
An existing page remains available while a new version is produced.
ISR combines CDN-friendly speed with refreshable content. Teams must deliberately set freshness, cache behavior, and acceptable short-lived staleness.
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