Commando is the official command framework for discord.js. It is flexible, fully object-oriented, easy to use, and makes it trivial to create your own powerful commands. Additionally, it makes full use of ES2017's async/await functionality for clear, concise code that is simple to write and easy to comprehend.

• Plain command names and aliases
• Regular expression triggers
• Robust parsing of arguments (with "quoted strings" support)
• Sophisticated argument system (optional)
  • Automatic prompting for arguments that aren't provided
  • Type system with rules, automatic validation, and parsing to usable values
    • Basic types (string, integer, float, boolean)
    • Discord objects (user, member, role, channel, message)
    • User-defined custom types
    • Union types
  • Automatic re-prompting of invalid arguments
  • Optional arguments with default values
  • Infinite arguments (arguments that accept as many values as provided)
• Multiple responses to commands
• Command editing (user edits their message that triggered the command, and the bot's response updates with it)
• Command reloading, as well as loading/unloading
• Command throttling/cooldowns

Node 8.6.0 or newer is required.
npm install discord.js-commando

View the docs here.
See the discord.js documentation as well.