Automattic/mongoose · error · TypeError

Invalid schema configuration: Could not determine the embedd

Error message

Invalid schema configuration: Could not determine the embedded type for array `${path}`. See https://mongoosejs.com/docs/guide.html#definition for more info on supported schema syntaxes.

What it means

Error "Invalid schema configuration: Could not determine the embedded type for array `${path}`. See https://mongoosejs.com/docs/guide.html#definition for more info on supported schema syntaxes." thrown in Automattic/mongoose.

Source

Thrown at lib/schema.js:1744

    if (cast) {
      type = cast[options.typeKey] && (options.typeKey !== 'type' || !cast.type.type)
        ? cast[options.typeKey]
        : cast;
      if (Array.isArray(type)) {
        return new MongooseTypes.Array(path, this.interpretAsType(path, type, options), obj, null, this);
      }

      name = typeof type === 'string'
        ? type
        : type.schemaName || utils.getFunctionName(type);

      // For Jest 26+, see #10296
      if (name === 'ClockDate') {
        name = 'Date';
      }

      if (name === void 0) {
        throw new TypeError('Invalid schema configuration: ' +
          `Could not determine the embedded type for array \`${path}\`. ` +
          'See https://mongoosejs.com/docs/guide.html#definition for more info on supported schema syntaxes.');
      }
      if (!Object.hasOwn(MongooseTypes, name)) {
        throw new TypeError('Invalid schema configuration: ' +
          `\`${name}\` is not a valid type within the array \`${path}\`.` +
          'See https://bit.ly/mongoose-schematypes for a list of valid schema types.');
      }

      if (name === 'Union' && typeof cast === 'object') {
        cast.parentSchema = this;
      }
    }

    return new MongooseTypes.Array(path, cast || MongooseTypes.Mixed, obj, options, this);
  }

  if (type?.instanceOfSchema) {

View on GitHub (pinned to 49cdab0136)

When it happens

Trigger: Thrown at lib/schema.js:1744 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/c0cb02b36bd48c7c. Report an issue: GitHub.