replace all ids of a JSON file with new UUIDs

replace-ids.js

#!/usr/bin/env node

const crypto = require("crypto");
const fs = require("fs");

const replaceIds = (obj) => {
  if (typeof obj !== "object" || obj === null) {
    return obj;
  }

  for (const [key, value] of Object.entries(obj)) {
    if (key === "id" && typeof value === "string") {
      obj[key] = crypto.randomUUID();
    } else if (typeof value === "object") {
      replaceIds(obj[key]);
    }
  }

  return obj;
};

const main = async (argv) => {
  const [, , ...args] = argv;

  if (args.length === 0) {
    throw new Error("missing input file");
  }

  const file = await fs.promises.readFile(args[0]);
  const json = JSON.parse(String(file));

  console.log(JSON.stringify(replaceIds(json), null, 2));
};

main(process.argv).catch((error) => {
  console.error(error);
  process.exitCode = 1;
});