Validating URL existence in a Discord bot (JavaScript)

Other Questions Discord bot
1

Hey everyone! I’m new to JavaScript and I’m working on a Discord bot. I need help with a command that generates a link based on user input. The tricky part is checking if the URL actually exists before sending it in chat.

If the URL doesn’t work, I want to send a wiki page instead. I’m using discord.js, but I’m not sure if I need to install anything else. Here’s what I’ve tried so far:

if (message.content.startsWith('!showme')) {
  const input = message.content.slice(7).toLowerCase();
  const url = `https://example.com/characters/${input}.html`;

  // How do I check if this URL exists?
  // If it doesn't, send a wiki link instead

  message.channel.send(url);
}

I’ve looked at some code examples online, but they crash my bot. Do I need to use AJAX or something else? Any help would be awesome!

2

For URL validation in a Discord bot, I’d recommend using the ‘got’ library. It’s reliable and easy to use. First, install it with ‘npm install got’. Then, modify your code like this:

const got = require(‘got’);

async function checkUrl(url) {
try {
await got.head(url);
return true;
} catch (error) {
return false;
}
}

// In your command handler:
const urlExists = await checkUrl(url);
if (urlExists) {
message.channel.send(url);
} else {
message.channel.send(‘https://wiki.example.com/characters’);
}

This approach is efficient and handles various edge cases. Remember to implement proper error handling and rate limiting to prevent abuse. Good luck with your bot!

3

yo, have u tried using axios? it’s pretty cool for http requests. just npm install axios and then:

const axios = require('axios');

axios.get(url)
  .then(() => message.channel.send(url))
  .catch(() => message.channel.send('wiki link here'));

works like a charm for me, hope it helps!

4

I’ve dealt with similar issues in my Discord bot projects. For URL validation, you don’t need AJAX since you’re working server-side. Instead, try using the ‘node-fetch’ package. It’s lightweight and perfect for this task.

First, install it with npm install node-fetch. Then, in your code:

const fetch = require('node-fetch');

// In your command handler:
const response = await fetch(url);
if (response.ok) {
  message.channel.send(url);
} else {
  message.channel.send('https://wiki.example.com/characters');
}

This checks if the URL returns a successful status code. If not, it sends the wiki link. Remember to wrap this in a try-catch block to handle network errors gracefully.

Hope this helps! Let me know if you need any clarification.