Discord.js/ROBLOX API Endpoint 问题返回“Typeerror: json.data is not iterable”

Posted 2023-03-28

【中文标题】Discord.js/ROBLOX API Endpoint 问题返回“Typeerror: json.data is not iterable”

【英文标题】：Discord.js/ROBLOX API Endpoint issue returning "Typeerror: json.data is not iterable"

【发布时间】：2021-09-20 06:31:20

【问题描述】：

const Discord = require('discord.js');
const client = new Discord.Client();
const config = require('./config.json');
const token = config.token;
const globalprefix = config.prefix;
const fetch = require('node-fetch');

client.once('Ready', () => 
    console.log('Client is ready!')
);

function EmbedMaker(GroupRank, Username) 
    const FunctionEmbedMessager = new Discord.MessageEmbed()
        .setTitle(Username + "'s NUSA Role")
        .setField('NUSA Role', GroupRank, false);
  return FunctionEmbedMessager;
;

function GetUserIdFromUsername(Username) 
    (async () => 
        const json = await fetch("https://api.roblox.com/users/get-by-username?username=" + Username)
        .then((res) => res.json());
        for (const info of json.data) 
        return info.Id
        
    )();
;

client.on('message', msg => 
    if (!msg.content.startsWith(globalprefix) || msg.author.bot) return;

    const args = msg.content.slice(globalprefix.length).trim().split(' ');
    const command = args.shift().toLowerCase();

    if (command === 'checknusarole') 
        if (!args[0])  msg.channel.send('**You did not specify a username to check the NUSA role of.**')
        
        (async () => 
            const json = await fetch("https://groups.roblox.com/v2/users/" + GetUserIdFromUsername(args[0]) + "/groups/roles")
              .then((res) => res.json())
        .catch(() => false);
      if (!json.data) return
            for (const info of json.data) 
       
              if (info.group === 758071) 
          console.log('its nusa')
                  const ReturnedEmbed = EmbedMaker(info.group.role.name, args[0])
          msg.channel.send(ReturnedEmbed)
              
            
          )();
        
    
);

client.login(token);

基本上，上面的代码应该向该 url 发送一个请求，从而导致 JSON 响应，每当我运行此代码时，它会说“类型错误：JSON.data 不可迭代”，我已经尝试过捕获，打破 for in 循环等。

【参考方案1】：

就像错误所说的那样，json.data is not iterable。如果我是正确的，你应该把它放在你的.then()而不是它之后。这是你应该如何做的。另外，如果res.json() 不是数组或映射（我认为它是一个对象），请改用for…in。

            const json = await fetch("https://groups.roblox.com/v2/users/" + GetUserIdFromUsername(args[0]) + "/groups/roles")
              .then((res) =>  
      const json = res.json()
       
      if (!json.data) return
            for (const info of json.data) 
       
              if (info.group === 758071) 
          console.log('its nusa')
                  const ReturnedEmbed = EmbedMaker(info.group.role.name, args[0])
          msg.channel.send(ReturnedEmbed)
              

            )