MONGOOSE

MONGOOSE

Error message

Mongoose: `Document.prototype.validateSync()` is deprecated and will be removed in Mongoose 10. Use `Document.prototype.validate()` instead.

What it means

Error "Mongoose: `Document.prototype.validateSync()` is deprecated and will be removed in Mongoose 10. Use `Document.prototype.validate()` instead." thrown in Automattic/mongoose.

Source

Thrown at lib/document.js:3411

 *
 *     const err = doc.validateSync();
 *     if (err) {
 *       handleError(err);
 *     } else {
 *       // validation passed
 *     }
 *
 * @param {Array|string} [pathsToValidate] only validate the given paths
 * @param {object} [options] options for validation
 * @param {boolean} [options.validateModifiedOnly=false] If `true`, Mongoose will only validate modified paths, as opposed to modified paths and `required` paths.
 * @param {Array|string} [options.pathsToSkip] list of paths to skip. If set, Mongoose will validate every modified path that is not in this list.
 * @return {ValidationError|undefined} ValidationError if there are errors during validation, or undefined if there is no error.
 * @deprecated Use `validate()` instead. `validateSync()` does not run middleware and will be removed in Mongoose 10.
 * @api public
 */

Document.prototype.validateSync = function() {
  utils.warn('Mongoose: `Document.prototype.validateSync()` is deprecated and will be removed in Mongoose 10. Use `Document.prototype.validate()` instead.');
  return this.$__validateSync.apply(this, arguments);
};

/*!
 * ignore
 */

Document.prototype.$__validateSync = function(pathsToValidate, options) {
  const _this = this;

  if (arguments.length === 1 && typeof arguments[0] === 'object' && !Array.isArray(arguments[0])) {
    options = arguments[0];
    pathsToValidate = null;
  }

  const hasValidateModifiedOnlyOption = options &&
      (typeof options === 'object') &&
      ('validateModifiedOnly' in options);

View on GitHub (pinned to 49cdab0136)

When it happens

Trigger: Thrown at lib/document.js:3411 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of Automattic/mongoose@49cdab0136 (2026-08-21). Data as JSON: /api/errors/223c9bda3189ec7d. Report an issue: GitHub.