Joi.validate code example

Example 1: joi object id validation

npm i joi-objectid

const Joi = require('joi');
Joi.objectId = require('joi-objectid')(Joi)

// now you can use Joi.objectId to validate the post request sent by user

Example 2: joi regex validate

Joi.string().regex(/^[a-zA-Z0-9_][a-zA-Z0-9_.]*/)