json8-patch/lib/valid.js

JSON Patch toolkit for JavaScript

"use strict";

module.exports = function valid(patch) {
  if (!Array.isArray(patch)) return false;

  for (let i = 0, l = patch.length; i < l; i++) {
    const op = patch[i];

    if (typeof op !== "object" || op === null || Array.isArray(op))
      return false;

    if (typeof op.path !== "string") return false;

    const operation = op.op;
    if (typeof op.op !== "string") return false;

    switch (operation) {
      case "add":
      case "replace":
      case "test":
        if (op.value === undefined) return false;
        break;
      case "move":
      case "copy":
        if (typeof op.from !== "string") return false;
        break;
      case "remove":
        break;
      default:
        return false;
    }
  }

  return true;
};