/pages ↔ ( Next 12 ) dir to export default Page

[id].tsx

( Next 12 ) FC to export default Page with Dynamic Route with _id URL Parameter

/pages/api

dir to map to API endpoint, instead of Page for server-side bundle

References

1. Incremental Adoption ↔ (feat) Next 12 compat with Next 13, can migrate individual Page from /pages to /app