使用discord.js发送JSON文件时触发TypeError错误求助

我尝试用discord.js将JavaScript对象以JSON文件形式发送，但操作不像发图片那样简单。我试过用AttachmentBuilder搭配/不搭配JSON.stringify、设置/不设置文件名，代码如下：

const jsonFile = new AttachmentBuilder(JSON.stringify(data), {
    name: embedName + ".json",
});
message.reply({ content: "Data:", files : [jsonFile]})

但无论怎么传递数据，都会触发如下错误：

TypeError: Cannot read properties of undefined (reading 'Symbol(Symbol.asyncIterator)')
    at DataResolver.resolveFile (C:\Users\___\node_modules\discord.js\src\util\DataResolver.js:117:24)
    at MessagePayload.resolveFile (C:\Users\___\node_modules\discord.js\src\structures\MessagePayload.js:260:54)
    at C:\Users\___\node_modules\discord.js\src\structures\MessagePayload.js:225:85
    at Array.map (<anonymous>)
    at MessagePayload.resolveFiles (C:\Users\___\node_modules\discord.js\src\structures\MessagePayload.js:225:56)
    at StringSelectMenuInteraction.reply (C:\Users\___\node_modules\discord.js\src\structures\interfaces\InteractionResponses.js:109:70)
    at module.exports.run (C:\Users\___\interactions\StringSelectMenu\select-embed.js:38:20)
    at async Object.run (C:\Users\___\events\interactionCreate.js:24:11)
    at async SkeeBot.<anonymous> (C:\Users\___\classes\SkeeBot.js:96:11)

解决方法 #

问题出在AttachmentBuilder的参数类型上——它不接受直接传入JSON字符串，需要把字符串转换成Buffer（Node.js环境）或者Blob（浏览器环境）。修正后的代码如下：

const jsonString = JSON.stringify(data);
const jsonBuffer = Buffer.from(jsonString);
const jsonFile = new AttachmentBuilder(jsonBuffer, {
  name: `${embedName}.json`,
});
message.reply({ content: "Data:", files: [jsonFile] });

原因是discord.js的AttachmentBuilder仅识别Buffer、Blob或本地文件路径作为文件内容来源。直接传字符串的话，内部解析逻辑无法将其处理为可迭代的文件流，因此抛出了Symbol.asyncIterator相关的错误。转换成Buffer后，discord.js就能正确解析并发送这个JSON文件了。

内容的提问来源于stack exchange，提问作者Bimo