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

In the latest version use message as.

var schema = Joi.object().keys({
  firstName: Joi.string().min(5).max(10).required().messages({
    "string.base": `"username" should be a type of 'text'`,
    "string.empty": `"username" cannot be an empty field`,
    "any.required": `"username" is a required.`,
  }),
  lastName: Joi.string().min(5).max(10).required().messages({
    "string.base": `"lastName" should be a type of 'text'`,
    "string.empty": `"lastName" cannot be an empty field`,
    "any.required": `"lastName" is a required.`,
  }),
  [...]
});