Controllers with JOI validation

• npm i joi

1. POST
   • Make controller without JOI
   • Import Joi to controller file and describe in SCHEMA required fields of the object waiting

     See the Pen 11 - JOI import & describe SCHEMA for object by Andrii (@imitator) on CodePen.

   • Then in function before all code validate req.body by

     const { error, value } = productSchema.validate(req.body);

   • So if we get required fields our code in function works as a usual, if something wrong, we get error and should process it by usual if () {}

     See the Pen 13 - POST with JOI validation by Andrii (@imitator) on CodePen.

   • P.S. For reusing productSchema somewhere else (f.e. for updating item) we may move schema from file controller to separate place, f. e. to utils/validate/product-joi.js
     const Joi = require('joi');

     const productSchema = Joi.object({

     name: Joi.string().min(2).required(),

     price: Joi.number().min(0).required(),

     });

     module.exports = productSchema;

     And in controller only import it by

     const productSchema = require('../../utils/validate/product-joi');