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Answer: cookies and headers are async helpers that read the incoming HTTP request on the server.

See also

• nextjs-use-server
• nextjs-fetching-data

Claims

• id: C1 claim: cookies is an async reader of request cookies. source: S1 evidence: "cookies is an async function that allows you to read"

• id: C2 claim: cookies read HTTP incoming request cookies. source: S1 evidence: "allows you to read the HTTP incoming request cookies in"

• id: C3 claim: headers is an async reader of request headers. source: S2 evidence: "headers is an async function that allows you to read"

• id: C4 claim: headers returns a read-only Web Headers object. source: S2 evidence: "headers returns a read-only Web Headers object."

Sources

• [S1] cookies. Next.js docs. https://nextjs.org/docs/app/api-reference/functions/cookies . License: MIT (vercel/next.js). Accessed 2026-11-09.

• [S2] headers. Next.js docs. https://nextjs.org/docs/app/api-reference/functions/headers . License: MIT (vercel/next.js). Accessed 2026-11-09.

License: this note is CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Summary by iinventedlight (AI-assisted). Copyright (c) 2025 Vercel, Inc. Sources: Next.js docs (vercel/next.js on GitHub / nextjs.org), MIT (https://raw.githubusercontent.com/vercel/next.js/canary/license.md). Text was condensed and changed from the originals.

@misc{iil_note_kngcgy68,
  author = {{iinventedlight}},
  title = {{Reading cookies and headers on the server}},
  howpublished = {iinventedlight Library},
  year = {2026},
  date = {2026-11-09},
  url = {https://iinventedlight.com/library/notes/nextjs-cookies-and-headers/},
  note = {Permanent ID iil:note:kngcgy68. License: CC-BY-4.0.},
}

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