Joi validation return only one error message

I have a three field form made of a name field, email field and a textarea. I'm using Joi 4.7.0 version along with hapijs. I use the object below validate the input. I receive the data object from an ajax call. When I fill all the three fields with wrong informations I get only the message relative to the first wrong field. Like that:

"{"statusCode":400,"error":"Bad Request","message":"name is not allowed to be empty","validation":    {"source":"payload","keys":["data.name"]}}"

validate: {
      payload: {
        data: {
          name: Joi.string().min(3).max(20).required(),
          email: Joi.string().email().required(),
          message: Joi.string().min(3).max(1000).required()
        }
      }
}

For explanation let suppose to not fill the three field. I get only one message error and not the message error of the others fields. Why?

Solution

It happens because Joi aborts early by default.

abortEarly - when true, stops validation on the first error, otherwise returns all the errors found. Defaults to true.

*EDIT: Configuration has changed in hapi 8.0. You need to add abortEarly: false to the routes config:

var server = new Hapi.Server();
server.connection({
    host: 'localhost',
    port: 8000,
    routes: {
        validate: {
            options: {
                abortEarly: false
            }
        }
    }
});

*See the Joi API documentation for more details.
*Also, see validation under Hapi Route options.

So Joi stops the validation on the first error:

var Hapi = require('hapi');
var Joi = require('joi');

var server = new Hapi.Server('localhost', 8000);

server.route({
    method: 'GET',
    path: '/{first}/{second}',
    config: {
        validate: {
            params: {
                first: Joi.string().max(5),
                second: Joi.string().max(5)
            }
        }
    },
    handler: function (request, reply) {

        reply('example');
    }
});

server.start();

server.inject('/invalid/invalid', function (res) {

    console.log(res.result);
});

Outputs:

{ statusCode: 400,
  error: 'Bad Request',
  message: 'first length must be less than or equal to 5 characters long',
  validation: { source: 'params', keys: [ 'first' ] } }

You can however configure Hapi to return all errors. For this, you need to set abortEarly to false. You can do this in server configuration:

var server = new Hapi.Server('localhost', 8000, { validation: { abortEarly: false } });

If you run the script now, you get:

{ statusCode: 400,
  error: 'Bad Request',
  message: 'first length must be less than or equal to 5 characters long. second length must be less than or equal to 5 characters long',
  validation: { source: 'params', keys: [ 'first', 'second' ] } }