Defining Specs

first we must define the validation spec for request body using Joi

spec.js

import Joi from 'joi';

export const DEVICE_SPEC = Joi.object().keys({
    serialNo: Joi.string()
        .alphanum()
        .min(3)
        .max(25)
        .required(),
    manufacturedYear: Joi.number()
        .integer()
        .min(1900)
        .required(),
    type: Joi.string()
        .valid(['TYPE-A','TYPE-B'])
        .required(),
});