Sanitize keys in an object

sanitize.ts

import crypto from "crypto";

export const sanitize = (object: Record<string, unknown>, keysToHash: string[]): Record<string, unknown> => {
  if (!object) {
    return object;
  }
  
  const result: Record<string, unknown> = {};

  Object.entries(object).forEach(([key, value]) => {
    if (!value) {
      result[key] = value;
      return;
    }

    if (keysToHash.includes(key)) {
      result[key] = crypto.createHash("sha256").update(JSON.stringify(value)).digest("hex");
      return;
    }

    if (Array.isArray(value)) {
      result[key] = value.map((item) => sanitize(item as Record<string, unknown>, keysToHash));
      return;
    }

    if (typeof value === "object" && !(value instanceof Date)) {
      result[key] = sanitize(value as Record<string, unknown>, keysToHash);
      return;
    }

    result[key] = value;
  });

  return result;
};

usage.ts

const payload = {
  id: 1,
  name: "Lee",
};

const sanitizedPayload = sanitize(payload, ["name"]);

console.log(sanitizedPayload);
// { id: 1, name: "<hash>" }