Node.JS：从 JSON 对象请求键值

Question

API_URL show something like this:

{
    "posts": [{
        "id": "987f2bhfzu3r3f43fg",
        "uuid": "g3g4g-4g34gd7f-40ae-96g43g82-65g34g43ccec94a566",
        "title": "This is my title",
        "tag": "thistag"
    }]
}

const request = require('request');


request('API_URL', { json: true }, (err, res, body) => {
  if (err) { return console.log(err); }
  console.log(body.posts);

});

Returns me

[{
    "id": "987f2bhfzu3r3f43fg",
    "uuid": "g3g4g-4g34gd7f-40ae-96g43g82-65g34g43ccec94a566",
    "title": "This is my title",
    "tag": "thistag"
}]

If I try console.log(body.posts.title); in my code it returns

undefined

Who do I get the keyvalue of title ?

Answer 1

Note the square brackets ( [] ) - you have got an array with a single element. You first need to subscript that element, and only then access the field:

console.log(body.posts[0].title)
// Here --------------^

Answer 2

body.posts is an array so you need to iterate the elements to print the title like:

for(let post of body.posts){
    console.log(post.title);
}

Answer 3

You should use body.posts[0].title . In json the square brackets indicate a list. I hope it helps.