Node.js + Joi how to display a custom error messages?

Question

It seems pretty straight forward to validate user\'s input in Node.js RESTapi with Joi.

But the problem is that my app is not written in English. That m

Answer 1

The best solution I found was :

Create a Middleware for JOI validation

Validator.js - You can create your custom error object

const Joi = require('Joi');

module.exports = schema => (req, res, next) => {
  const result = Joi.validate(req.body, schema);
  if (result.error) {
    return res.status(422).json({
      errorCause: result.error.name,
      missingParams: result.error.details[0].path,
      message: result.error.details[0].message
    });
  }
  next();
};

In the routes or controller pass this middleware function

const joiValidator = require('../utils/validator'); // Wherever you have declare the validator or middlerware

   const  userSchema = joi.object().keys({
    email : joi.string().email().required(),
    password : joi.string().required()
  });

  routes.routes('/').get(joiValidator(userSchema), (req, res) => {
    res.status(200).send('Person Check');
  });