node.js中joi模块的基本使用方式

//引入joi模块
const Joi = require('joi');
//定义对象的验证规则
const schema = {
    username: Joi.string().min(2).max(5).required().error(new Error('username属性没有通过验证')),
    birth: Joi.number().min(1900).max(2020).error(new Error('birth没有通过验证'))
};
async function run() {
    try {
        //实施验证
        await Joi.validate({ username: 'ab', birth: 1800 }, schema);
    } catch (ex) {
        console.log(ex.message);
        return;
    }
    console.log('验证通过');
}
run();

npm install joi --save
import Joi from 'joi'

const schema = Joi.string()

const result = schema.validate('1')
console.log(result)
// 此时result为 { value: '1' }

const schema = Joi.string()
const result = schema.validate(1)
console.log(result)
// result:
{
  value: 1,
  error: [Error [ValidationError]: "value" must be a string] {
    _original: 1,
    details: [ [Object] ]
  }
}
console.log(result.error.message)
// "value" must be a string

Joi.string().allow('').required()

Joi.number().min(18).max(35)

Joi.array().items(Joi.string()).length(3)

Joi.object({
    p1: Joi.string()
})

Joi.func()

Joi.date()

Joi.any()

Joi.string().pattern(/\d/ig)

Joi.empty()

const schema = Joi.object({
    age: Joi.number().valid(14, 16, 18),
    childAge: Joi.number().valid(Joi.in('age')),
    childAgeBack: Joi.ref('childAge'),
    childAgeBack1: Joi.ref('childAge', {ancestor: 2}),
})

const schema = Joi.object({
  a: Joi.any(),
  b: Joi.any()
}).with('a', 'b');
const schema = Joi.object({
  a: Joi.any(),
  b: Joi.any()
}).without('a', ['b']);
const schema = Joi.object({
  a: Joi.any(),
  b: Joi.any()
}).xor('a', 'b');

const schema = Joi.object({
  mode: Joi.string().allow('email', 'phone').required(),
  address: Joi.string().when('mode', { is: 'email', then: Joi.string().email() }).required()
});

const { error } = schema.validate({
  name: 'chaorenya'
}).unknown() // 允许出现其他字段

// demo1
  if ((!req.body.keyList || !req.body.keyList.length) && !req.body.hasFilter) {
    return new req.Exception(`keyList / hasFilter ${req.ReturnMessages.INVALID}`)
  }
// joi ed
const schema = Joi.object({
    keyList: Joi.when('hasFilter', { is: Joi.not(true), then: Joi.array().min(1).required() }),
    hasFilter: Joi.boolean()
  })
// demo2
 if (!['FAT', 'FWS'].includes(ENV)) {
    return new req.Exception('env INVALID')
  }
// joi ed
const schema = Joi.object({  
    env:Joi.string().valid('FAT', 'FWS').insensitive().required()
  })
// 或者可以转换为大写再比较，Joi.string().uppercase().valid().required()