These are some simple examples for using Slash Commands in discord.js.
discord.js doesn't have full support for slash commands yet (there's a wip pr) but you can still use the underlying api and websocket to use them.
Note that discord.js doesn't officially support using client.api, this is basically just a workaround until they fully release support.

Please read Discord's Slash Command docs since they have actual docs and details for slash commands; the code examples below are just how you can implement it using discord.js.

You only need to register each command one time. You might wanna use an eval command for this.

Send a Command object

global commands show in all authorized servers, but take up to an hour to deploy.

// if your application id and bot id are different, change client.user.id to the application id
client.api.applications(client.user.id).commands.post({data: {
    name: 'ping',
    description: 'ping pong!'
}})

guild commands deploy immediately - use these for testing

// if your application id and bot id are different, change client.user.id to the application id
client.api.applications(client.user.id).guilds('guild id').commands.post({data: {
    name: 'ping',
    description: 'ping pong!'
}})

interaction is an Interaction object

client.ws.on("INTERACTION_CREATE", async interaction => {
  
})

send an Interaction Response object

client.api.interactions(interaction.id, interaction.token).callback.post({data: {
  type: 4,
  data: {
    content: 'hello world!'
    }
  }
})

shortlink: s.advaith.io/slashdjs