Convert base64 PNG string to image file (migrating from database to object storage)

image-convert.mjs

/**
 * Usage: Put a base64 encoded PNG image string into a file called image.txt
 * Run: `node image-covert.mjs --file image.txt`
 * Receive: Output file with random UUID for storage in object storage
 */
import fs from "node:fs/promises";
import crypto from "crypto";
import { parseArgs } from "node:util";

const uuid = crypto.randomUUID();

const args = process.argv;
const options = {
  file: {
    type: "string",
  },
};
const { values } = parseArgs({
  args,
  options,
  allowPositionals: true,
});

const input = await fs.readFile(`./${values.file}`);
await fs.writeFile(`./${uuid}.png`, Buffer.from(input.toString(), "base64"));