Automattic/mongoose · error · TypeError

Invalid value for schema path `${fullPath}`, got value "${va

Error message

Invalid value for schema path `${fullPath}`, got value "${val}"

What it means

Error "Invalid value for schema path `${fullPath}`, got value "${val}"" thrown in Automattic/mongoose.

Source

Thrown at lib/schema.js:811

  prefix = prefix || '';
  // avoid prototype pollution
  if (prefix === '__proto__.' || prefix === 'constructor.' || prefix === 'prototype.') {
    return this;
  }

  const keys = Object.keys(obj);
  const typeKey = this.options.typeKey;
  for (const key of keys) {
    if (utils.specialProperties.has(key)) {
      continue;
    }

    const fullPath = prefix + key;
    const val = obj[key];

    if (val == null) {
      throw new TypeError('Invalid value for schema path `' + fullPath +
        '`, got value "' + val + '"');
    }
    // Retain `_id: false` but don't set it as a path, re: gh-8274.
    if (key === '_id' && val === false) {
      continue;
    }
    // Deprecate setting schema paths to primitive types (gh-7558)
    let isMongooseTypeString = false;
    if (typeof val === 'string') {
      // Handle the case in which the type is specified as a string (eg. 'date', 'oid', ...)
      const MongooseTypes = this.base?.Schema.Types ?? Schema.Types;
      const upperVal = val.charAt(0).toUpperCase() + val.substring(1);
      isMongooseTypeString = MongooseTypes[upperVal] != null;
    }
    if (
      key !== '_id' &&
      ((typeof val !== 'object' && typeof val !== 'function' && !isMongooseTypeString) ||
      val == null)

View on GitHub (pinned to 49cdab0136)

When it happens

Trigger: Thrown at lib/schema.js:811 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/21a09504b5a9d177. Report an issue: GitHub.