ValidationError > s.string Expected a string primitive Received: | undefined

Question

Im using discord js to make a multi-purpose discord bot for my server, but its giving me this error:

ValidationError: Expected a string primitive

It was working fine yesterday but i forgot to save something and i dont know what.

const fs = require('node:fs');
const path = require('node:path');
const {
  Client,
  GatewayIntentBits,
  Partials,
  Collection,
} = require("discord.js");

const { Player } = require('discord-player');
const { Routes } = require('discord-api-types/v10');
const { token, prefix, guildId, clientId } = require('./config.json');
const { REST } = require('@discordjs/rest');
const client = new Client({
  intents: [
    GatewayIntentBits.Guilds,
    GatewayIntentBits.GuildMembers,
    GatewayIntentBits.MessageContent,
    GatewayIntentBits.GuildMessages,
    GatewayIntentBits.GuildPresences,
    GatewayIntentBits.GuildVoiceStates
  ],
  partials: [
    Partials.Channel,
    Partials.Message,
    Partials.User,
    Partials.GuildMember,
  ],
});

client.player = new Player(client, {
  ytdlOptions: {
    quality: "highestaudio",
    highWaterMark: 1 << 25
  }
});

module.exports = client;

//  command handler

//slash commands 
const slashCommands = [];
client.slashCommands = new Collection();

const commandsPath = path.join(__dirname, "commands"); // E:\yt\discord bot\js\intro\commands
const slash_commandFiles = fs.readdirSync(commandsPath).filter(file => file.endsWith('S.js'));
for(const file of slash_commandFiles)
{
    const filePath = path.join(commandsPath, file);
    const command = require(filePath);

    client.slashCommands.set(command.data.name, command);
    slashCommands.push(command.toJSON());
}

console.log(slashCommands);

//message commands
client.messageCommands = new Collection();
const message_commandFiles = fs.readdirSync(commandsPath).filter(file => file.endsWith('M.js'));
for (const file of message_commandFiles) {
  const filePath = path.join(commandsPath, file);
  const command = require(filePath);
  // Set a new item in the Collection
  // With the key as the command name and the value as the exported module
  client.messageCommands.set(command.Name, command);
}

//event handler
const eventsPath = path.join(__dirname, 'events');
const eventFiles = fs.readdirSync(eventsPath).filter(file => file.endsWith('.js'));

for (const file of eventFiles) {
  const filePath = path.join(eventsPath, file);
  const event = require(filePath);
  if (event.once) {
    client.once(event.name, (...args) => event.execute(...args));
  } else {
    client.on(event.name, (...args) => event.execute(...args));
  }
}

// messageCommand handler

client.on('messageCreate', (message) => {
  const args = message.content.slice(prefix.length).split(' ');
  const command = args[0];
  if (client.messageCommands.get(command)) {
    let Command = client.messageCommands.get(command);
    Command.execute(message);
  }
});

client.on('ready', () => {
  const rest = new REST({ version: '9' }).setToken(token);
  rest.put(Routes.applicationGuildCommands(clientId, guildId),
    { body: slashCommands })
    .then(() => console.log('Successfully updated commands for guild ' + guildId))
    .catch(console.error);
  console.log('bot is online!');
  client.user.setStatus('idle');
});
client.login(token);

im sure there's nothing wrong with any of the command files because it was working fine yesterday. there's 100% an error in this line slashCommands.push(command.toJSON()); but I cant seem to fix it. The command.toJSON() console logs just fine but gives an error while trying to push into the list

Answer 1

Ran into the same issue, turns out options (i.e. addUserOption) require a description. Point is it's really confusing as this error shows up when doing command.data.toJSON(). If you are dynamically loading the command files as described in the guide and running into this issue, then try manually doing a require to trigger the validation beforehand.