如何打印正确的json错误？

Question

我有一个包含登录表单的简单代码。我已为登录输入字段启用服务器端验证。代码如下：

const validator = require('validator')
const isEmpty = require('./util')

const validateLoginInput = (data) => {
let errors= {}

data.email = !isEmpty(data.email) ? data.email : '';
data.password = !isEmpty(data.password) ? data.password : '';

if(validator.isEmpty(data.email))
    errors.email= "Email is required"

if(validator.isEmpty(data.password))
    errors.password= "Password is required"

if(!validator.isEmail(data.email))
    errors.email= "Email Incorrrect"

return{
    errors,
    isValid: isEmpty(errors)
}

}

并且使用它的api是：

exports.registerPatient = (req,res) =>{

const {isValid, errors} = validateRegisterPatient(req.body)

if(!isValid)
    return res.status(400).json(errors)

现在，当我在邮递员上运行此后端代码时，仅提供密码而不提供电子邮件，我希望收到错误"Email is required"，但不幸的是，我碰到了错误"Email Incorrect"。有任何修复程序吗？

Answer 1

您的最后一个验证将覆盖第一个验证。为了防止这种情况，您可以使用：

const validator = require('validator')
const isEmpty = require('./util')

const validateLoginInput = (data) => {
let errors= {}

data.email = !isEmpty(data.email) ? data.email : '';
data.password = !isEmpty(data.password) ? data.password : '';

// Email validations (2 of them)
if(validator.isEmpty(data.email))
    errors.email= "Email is required"
else if(!validator.isEmail(data.email))
    errors.email= "Email Incorrrect"

// Password validations (Only 1 validation)
if(validator.isEmpty(data.password))
    errors.password= "Password is required"

return{
    errors,
    isValid: isEmpty(errors)
}

Answer 2

您可以使用双感叹号：

let email='';
console.log(!!email);

email = null
console.log(!!email);

email = undefined ;
console.log(!!email);