How to save a file sent in a message?

Question

Node.js

I need to track the presence of an attached file in the message, and if there is one, get its link. How many searched on the Internet, but found nothing.
I will make a reservation that I am a beginner in this area, so please do not throw sticks and too smart words.
Thanks in advance for your reply.

Answer 1

Something like this:

const fs = require("fs");
const Discord = require("discord.js");
const client = new Discord.Client();

client.login("ТУТ ВАШ ТОКЕН");

...

// обработчик события message
client.on('message', async message => {

    const filename = Date.now()+".json";
    const data = {
        content: message.content,
        attachments: message.attachments.map(attach=>{
            return {
                id: attach.id,
                url: attach.url,
                proxyURL: attach.proxyURL,
                filename: attach.filename,
                filesize: attach.filesize,
                height: attach.height,
                width: attach.width
            };
        })
    };

    // не забудьте создать папочку logs в папке с ботом
    fs.writeFile('./logs/'+filename, JSON.stringify(data), (err) => {
        if (err) throw err;
    });
});

well, here is an example of what the bot will write to the logs folder (this is a log with your message to my bot :)

{
  "content":"Тест",
  "attachments":[
    {
      "id":"686193341083549696",
      "url":"https://cdn.discordapp.com/attachments/452202521671237653/686193341083549696/IMG-30dd366b26acb4b1cbbe786f3ad22862-V.jpg",
      "proxyURL":"https://media.discordapp.net/attachments/452202521671237653/686193341083549696/IMG-30dd366b26acb4b1cbbe786f3ad22862-V.jpg",
      "filename":"IMG-30dd366b26acb4b1cbbe786f3ad22862-V.jpg",
      "filesize":58121,
      "height":330,
      "width":374
    }
  ]
}

each attachment contains 2 links (normal url and proxyurl):
url https://cdn.discordapp.com/attachments/45220252167...
proxyurl https://media.discordapp.net/attachments/452202521...