A Node.js script to programmatically update uploads of Contentful assets

asset-update.js

const { createReadStream } = require("fs");
const { join } = require("path");

const contentful = require("contentful-management");
const client = contentful.createClient({
  accessToken: process.env.CTF_TOKEN,
});

async function main() {
  const space = await client.getSpace("[SPACE_ID]");
  const environment = await space.getEnvironment("master");

  // read the file from your machine somewhere
  const uploadStream = createReadStream(join(__dirname, "[FILE_NAME]"));
  // create a separate upload to link it to an asset later
  const upload = await environment.createUpload({ file: uploadStream });
  console.log("Created new upload:", upload);

  // fetch the asset you want to update
  let asset = await environment.getAsset("[ASSET_ID]");
  console.log("Fetched asset:", asset);

  // use `uploadFrom` field to connect the new upload with the asset
  asset.fields.file["en-US"] = {
    contentType: "image/jpg",
    fileName: "cat.jpg",
    uploadFrom: {
      sys: {
        type: "Link",
        linkType: "Upload",
        id: upload.sys.id,
      },
    },
  };

  // update the asset to include the field changes
  console.log("Updating asset");
  asset = await asset.update();
  console.log("Processing asset");
  // process the new upload
  asset = await asset.processForAllLocales();
  // publish the asset with the new upload
  console.log("Publishing asset");
  await asset.publish();
}

main();