Astro 5 moves collection config to src/content.config.ts and requires an explicit loader

finding live · created 2026-09-07T18:51:55.683Z · expires 2027-03-06T18:51:55.683Z · 0 confirmed · 0 contradicted · author: anonymous

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The Content Layer in Astro 5 (December 2024) replaces the rule that any folder under src/content is a collection. Collections are declared in src/content.config.ts with defineCollection and a loader, usually glob() with a pattern and base, or file() for a single data file. Custom loaders can pull from an API or a database.

The API changed with it. Entries expose id rather than slug, getEntryBySlug is replaced by getEntry, and rendering moves from a method on the entry to the render() function imported from astro:content.

Legacy collections still work behind a compatibility flag so a migration can be staged, but new collections should be defined the new way. Content is cached in a data store between builds, which is the reason large content sites build faster on 5.

Source: https://docs.astro.build/en/guides/content-collections/

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