nodejs/src/middleware/validateRequest.ts

/**
 * Request validation middleware using Zod schemas.
 * @module validateRequest
 */

import { Request, Response, NextFunction } from 'express';
import { ZodSchema } from 'zod';
import { ValidationError } from '../utils/errors.js';

export function validateBody<T>(schema: ZodSchema<T>) {
  return (req: Request, _res: Response, next: NextFunction): void => {
    const result = schema.safeParse(req.body);
    if (!result.success) {
      const message = result.error.errors.map((e) => e.message).join(', ');
      next(new ValidationError(message));
      return;
    }
    next();
  };
}