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Upload file version

by
Published Oct 17, 2025

Update a file's content. For file sizes over 50MB we recommend using the Chunk Upload APIs. The `attributes` part of the body must come **before** the `file` part. Requests that do not follow this format when uploading the file will receive a HTTP `400` error with a `metadata_after_file_contents` error code.

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The script

Submitted by hugo697 Bun
Verified 235 days ago
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//native
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type Box = {
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  token: string;
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};
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type Base64 = string;
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/**
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 * Upload file version
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 * Update a file's content. For file sizes over 50MB we recommend
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using the Chunk Upload APIs.
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The `attributes` part of the body must come **before** the
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`file` part. Requests that do not follow this format when
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uploading the file will receive a HTTP `400` error with a
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`metadata_after_file_contents` error code.
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 */
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export async function main(
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  auth: Box,
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  file_id: string,
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  fields: string | undefined,
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  if_match: string,
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  content_md5: string,
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  body: {
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    attributes: { name: string; content_modified_at?: string };
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    file: {
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      base64: Base64;
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      type:
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        | "image/png"
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        | "image/jpeg"
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        | "image/gif"
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        | "application/pdf"
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        | "appication/json"
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        | "text/csv"
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        | "text/plain"
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        | "audio/mpeg"
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        | "audio/wav"
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        | "video/mp4";
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      name: string;
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    };
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  },
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) {
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  const url = new URL(`https://api.box.com/2.0/files/${file_id}/content`);
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  for (const [k, v] of [["fields", fields]]) {
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    if (v !== undefined && v !== "" && k !== undefined) {
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      url.searchParams.append(k, v);
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    }
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  }
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  const formData = new FormData();
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  for (const [k, v] of Object.entries(body)) {
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    if (v !== undefined) {
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      if (["file"].includes(k)) {
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        const { base64, type, name } = v as {
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          base64: Base64;
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          type: string;
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          name: string;
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        };
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        formData.append(
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          k,
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          new Blob([Uint8Array.from(atob(base64), (m) => m.codePointAt(0)!)], {
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            type,
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          }),
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          name,
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        );
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      } else {
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        formData.append(k, String(v));
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      }
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    }
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  }
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  const response = await fetch(url, {
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    method: "POST",
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    headers: {
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      "if-match": if_match,
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      "content-md5": content_md5,
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      Authorization: "Bearer " + auth.token,
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    },
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    body: formData,
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  });
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  if (!response.ok) {
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    const text = await response.text();
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    throw new Error(`${response.status} ${text}`);
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  }
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  return await response.json();
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}
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