Setting up Slash Commands

If you have a prefix command execution, it can be created in the same command file.

All properties required for prefix commands are optional for slash commands.

data: new SlashCommandBuilder(),
async execute(interaction) {},

Here is a sample slash command created from our prefix command, ping:

const { SlashCommandBuilder } = require("discord.js");

const name = "ping";
const description = "Ping Pong Command!";

module.exports = {
    name,
    description,
    data: new SlashCommandBuilder()
        .setName(name)
        .setDescription(description),
    executePrefix(message, args, client) {
        return message.channel.send('Pong.');
    },
    async execute(interaction) {
        return await interaction.reply({
            content: 'Pong!'
        });
    }
};

Properties

dataSlashCommandBuilder
This is where you define the properties of the slash command using the SlashCommandBuilder Class. You can also follow the official Discord.js guide.

permissions number = 0
In slash commands, you can use this permission level to add an extra layer or feature based on the level, but it will not prevent execution since slash commands are manageable at the server/guild level.

global boolean = false
Default is always false. This is used to define if you want the slash command to be a global slash command. For guild based slash commands you will need to go to your .env file to set environment variable DEVELOPMENT_GUILD_ID, then you will have guild based slash commands for that specific guild id.

execute(interaction, client, level) Promise<Interaction>
This is a function that is invoked when the slash command is called to be executed.

Original interactionReply property in v3.1.0 or later

If both the interactionReply and data properties are defined for the same command, the execute property will still run prefix commands. This is provided for backward compatibility and will be removed in v4.0.0.

However, if the data property is defined and the interactionReply property is not, then it will execute as a slash command as expected in v4.0.0 and later.

Property	Type	Required	Description
interaction	CommandInteraction Class	true	This is the command interaction object that represents a slash command interaction on Discord.
client	Discord.Client	false	This is the Discord client object.
level	Number	false	This is the user's permission level.

returns Promise<Interaction>