Discord JS SlashCommandBuilder - node.js

Question

I'm Currently trying to implement SlashCommandBuilder into my Discord Bot.
The bot is currently using prefix '!' and I want to remake it to work with the SlashCommandBuilder, The following code is what i have used and tested, as it pretty much works fine or looks like it's working fine I'm still having an issue caused when someone uses '/hello' It will give him Error 'The application did not respond'.
I did double check the API, Token and such using a Prefix as a check.
The Code does actually add the command to the discord and it looks in the lists of commands.
I'm also splitting the commands inside 'commands' folder.
index.js :
const Discord = require('discord.js');
const fs = require('fs');
const { Client, Collection } = require('discord.js');
const { REST } = require('#discordjs/rest');
const config = require('./config.json');
const { Routes } = require('discord-api-types/v9');
const client = new Client();
const commandFiles = fs.readdirSync('./commands').filter(file => file.endsWith('.js'));
client.commands = new Collection();
for (const file of commandFiles) {
const command = require(`./commands/${file}`);
client.commands.set(command.name, command);
}
client.once('ready', () => {
console.log('Bot is ready!');
const rest = new REST({ version: '9' }).setToken(config.token);
rest.put(
Routes.applicationCommands(client.user.id),
{ body: client.commands },
)
.then(() => console.log('Successfully registered commands'))
.catch(error => console.error(error));
});
client.on('interactionCreate', async interaction => {
if (!interaction.isCommand()) return;
const command = client.commands.get(interaction.commandName);
if (!command) return;
try {
await command.execute(interaction);
} catch (error) {
console.error(error);
interaction.reply({ content: 'Error executing command', ephemeral: true });
}
});
client.login(config.token)
commands/hello.js
module.exports = {
name: 'hello',
description: 'Replys with Hi',
execute(interaction) {
interaction.reply({ content: 'Hi!' });
},
};
Please if anyone has information on why this was caused, i would love to listen.
Thank you for reading and appreciate any help or hints.