Download all CNFT images from an NFT Collection via Node.js

download-assets.js

import { BlockFrostAPI } from "@blockfrost/blockfrost-js"
import download from "download"

const API = new BlockFrostAPI({
  projectId: "YOUR_BLOCKFROST_API_KEY", // see: https://blockfrost.io
})

try {
  const assets = await API.assetsPolicyByIdAll(
    "POLICY_ID"
  )

  const start = 0
  const batchSize = 10
  const total = 10001

  for (let i = start; i < total; i += batchSize) {
    console.log(i + 1, i + batchSize)
    const assets10 = assets.slice(i + 1, i + batchSize)

    const ipfsLinks = await Promise.all(
      assets10.map(async (asset) => {
        const assetData = await API.assetsById(asset.asset)
        const ipfsId = assetData?.onchain_metadata?.image?.split("ipfs://")?.[1]

        return {
          id: assetData?.onchain_metadata?.name?.split("GOAT Tribe ")?.[1],
          image: `https://infura-ipfs.io/ipfs/${ipfsId}`,
        }
      })
    )

    const filterLinks = ipfsLinks.filter((item) => !!item.id)

    console.log(filterLinks)
    ;(async () => {
      await Promise.all(
        filterLinks.map((link) =>
          download(link?.image, "./images", { filename: `${link.id}.png` })
        )
      )
    })()

    // wait a few seconds to not overload max requests
    await new Promise((resolve) => setTimeout(resolve, 4000))
  }
  console.log("done")
} catch (err) {
  console.log("error", err)
}