const JoiSchemaBuilder = require('ak-json-to-joi');
let JoiValidationSchema = JoiSchemaBuilder.build(yourJSON);
let result = Joi.validate(yourPayloadJSON, JoiValidationSchema)

string
number
email
array
object
boolean

minLength: {integer value}
maxLength: {integer value}
optional: {true / false}
required: {true / false}
regex: {regex pattern}
default: {default value}

{
    "$array": {
        "name":{
            "$type":"string"
        },
        "number":{
            "$type":"number",
            "optional": true
        }
    }
}

{
    "name": {
        "original": {
            "$type": "string",
            "required": true,
            "maxLength": 200
        },
        "nick": {
            "$type": "string",
            "optional": true,
            "default": "arshad"
        }
    },
    "phone": {
        "$type": "number",
        "required": true
    },
    "email": {
        "$type": "email",
        "optional": true
    },
    "date": {
        "$type": "date",
        "minDate": "1-1-2017",
        "maxDate": "10-05-2018"
    }
}

'type' and 'array' key in validation json should be prefixed with '$' symbol
on missing $ symbol your validation might not work.