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typescriptbeginner

Express Zod Request Validation

Validate Express request body, params, and query with Zod schemas via reusable middleware.

typescript
import { Request, Response, NextFunction } from 'express';
import { ZodSchema, ZodError } from 'zod';

export function validate(schema: ZodSchema) {
  return (req: Request, res: Response, next: NextFunction) => {
    try {
      schema.parse({
        body: req.body,
        query: req.query,
        params: req.params,
      });
      next();
    } catch (err) {
      if (err instanceof ZodError) {
        res.status(400).json({
          error: 'Validation failed',
          issues: err.issues.map((i) => ({
            path: i.path.join('.'),
            message: i.message,
          })),
        });
        return;
      }
      next(err);
    }
  };
}

Use Cases

  • API input validation
  • Form submission handling

Tags

#express#zod#validation#middleware

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