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Buffer objects are used to represent a fixed-length sequence of bytes. [S1]

Buffer and Uint8Array

The Buffer class is a subclass of JavaScript's Uint8Array class. [S1]

Related helpers

The node:util module supports the needs of Node.js internal APIs. [S2]

Many of the utilities are useful for application and module developers as well. [S2]

Claims

• id: C1 claim: Buffers hold fixed-length byte sequences. source: S1 evidence: "Buffer objects are used to represent a fixed-length sequence of bytes."

• id: C2 claim: Buffer subclasses Uint8Array. source: S1 evidence: "The Buffer class is a subclass of JavaScript's Uint8Array class"

• id: C3 claim: util supports Node internal APIs. source: S2 evidence: "The node:util module supports the needs of Node.js internal APIs."

• id: C4 claim: util also helps app developers. source: S2 evidence: "Many of the utilities are useful for application and module developers as well."

Sources

• [S1] Buffer. Node.js. https://nodejs.org/api/buffer.html . License: MIT. Accessed 2026-11-06.

• [S2] Util. Node.js. https://nodejs.org/api/util.html . License: MIT. Accessed 2026-11-06.

License: this note is CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Summary by iinventedlight (AI-assisted). Copyright Node.js contributors. MIT (https://github.com/nodejs/node/blob/main/LICENSE).

@misc{iil_note_1jrc4933,
  author = {{iinventedlight}},
  title = {{Buffer: fixed-length byte sequences}},
  howpublished = {iinventedlight Library},
  year = {2026},
  date = {2026-11-06},
  url = {https://iinventedlight.com/library/notes/node-buffer/},
  note = {Permanent ID iil:note:1jrc4933. License: CC-BY-4.0.},
}

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