JSON返回对象的空值，无法读取该对象的属性

Question

我正在使用Express从外部API收集JSON响应，一些元素的值作为null返回给我。当我稍后尝试使用这些值(以及其他值)时，我得到了TypeError: Cannot read property 'avatar' of null错误。我试着覆盖它，但它总是返回null。当这个特定的参数值为"null“时，我可以跳过或覆盖它吗？下面是我的代码中我遇到问题的部分：

  var clearbit = require('clearbit')(apikey);
  clearbit.Enrichment.find({email: email, stream: true})
  .then(function (response) {
    var person  = response.person;
    var company = response.company;
    res.render('single-user', { 
        // any of below can be equal to null depending on the email that is being checked
        avatar: person.avatar,
        name: person.name.fullName,
        email: person.email,
        //other properties
     });
  })

Answer 1

您可以使用新引入的可选链接(?.)来解决这个问题。您的代码将如下所示：

var clearbit = require('clearbit')(apikey);
clearbit.Enrichment.find({email: email, stream: true})
.then(function (response) {
  var person  = response.person;
  var company = response.company;
  res.render('single-user', { 
      avatar: person?.avatar,
      name: person?.name?.fullName,
      email: person?.email,
     // Similarly for all properties
   });
})

这里有一个供参考的链接：https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Optional_chaining

希望这能有所帮助:)