discord.js

discord.js is the library that powers most Discord bots in existence. It wraps Discord's API in a clean, event-driven Node.js interface — message handling, slash commands, voice channels, embeds, buttons, and modals all covered.

If you're building a Discord bot in JavaScript or TypeScript, discord.js is the default choice. Discord.py is the Python equivalent with a similarly strong community. JDA covers Java. Serenity does it in Rust. Commercially, there's no equivalent — Discord bots are a DIY ecosystem.

The library tracks Discord's API changes closely, supports sharding for large bots (1000+ guilds), and the SlashCommandBuilder API makes registering commands straightforward.

The catch: Discord's API changes frequently, and breaking changes in discord.js major versions (v13 → v14 → v15) require significant rewrites. The learning curve for voice channels and complex interactions is steeper than basic message bots. Rate limiting is aggressive — your bot will hit it if you're not careful. And you're building on Discord's platform, which means your bot's existence depends on Discord's terms of service and API access policies.