Velocity Web API

Lightweight HTTP API for Velocity proxies. Expose player lists, per-server counts, per-player details, etc. Ideal for websites, bots or other monitoring applications. I built it for my own uses, but it might help someone else out too.

Quick Install

• Drop the compiled plugin JAR into your Velocity plugins/ folder.
• Start (or restart) your proxy; the plugin will create its data folder and a config.cfg (if missing) in the plugin data directory.

Configuration

• The plugin creates a config.cfg in its data folder on first run. Available keys:
  • port : port the HTTP server listens on (default 25576).
  • bindAddress : interface/address to bind the HTTP server (default 0.0.0.0 to listen on all IPv4 interfaces; set to 127.0.0.1 for local-only access).
  • checkUpdates : enable automatic Hangar update checks (default true).
  • snapshotUpdates : include snapshot/unstable updates in checks (default false).
  • debugEnabled : show debug messages (logger.debug) in the proxy console when true (default false).
  • allowedOrigins : CORS allowed origins for HTTP API access (comma-separated, or * for all) (default *).

Tested With

• Velocity 3.x (expects velocity-api on the runtime classpath)

Endpoints

All JSON endpoints return Content-Type: application/json; charset=utf-8 unless otherwise noted.

• /

  • Serves the embedded index.html (browser-friendly).
  • Example URL: http://localhost:25576/

• /playerlist

  • Purpose: list connected players with basic metadata and a total count.
  • Example URL: http://localhost:25576/playerlist
  • Sample response:

  {
  	"count": 2,
  	"players": 
  	[
  		{"username":"Alice","uuid":"...","currentServer":"lobby"},
  		{"username":"Bob","uuid":"...","currentServer":"minigames"}
  	]
  }
  

• /count

  • Purpose: return the total number of connected players.
  • Example URL: http://localhost:25576/count
  • Sample response:

  { 
  	"count": 42 
  }
  

• /player/<username> or /player?username=<name>

  • Purpose: fetch detailed info for a connected player (exact-case lookup).
  • Example URLs:
    • http://localhost:25576/player/Notch
    • http://localhost:25576/player?username=Notch
  • Notes: returns 400 if username is missing; 404 if the player is not connected.
  • Sample response:

  {
  	"username":"Notch",
  	"uuid":"...",
  	"currentServer":"lobby",
  	"ping":42,
  	"sessionDurationSeconds":360
  }
  

• /servers

  • Purpose: returns a mapping of server names to player counts.
  • Example URL: http://localhost:25576/servers
  • Sample response:

  { 
  	"lobby": 5, 
  	"minigames": 12 
  }
  

• /health

  • Purpose: lightweight health check for monitoring.
  • Example URL: http://localhost:25576/health
  • Sample response:

  { 
  	"status": "ok" 
  }
  

Commands

• /vwapi reload : reloads the config.cfg from the plugin data directory and restarts the HTTP server if the port or bindAddress have changed.
• /vwapi version : prints the plugin version (from the plugin metadata).
• /vwapi debug [on|off] : toggle or explicitly set debug logging at runtime. When enabled, the plugin prints detailed debug messages and HTTP access lines to the console.
• /vwapi status : shows the current HTTP server status (running/not running), the bound host and port, and an example URL you can visit (falls back to localhost when bound to all interfaces).
• /vwapi help : prints a short help listing the available /vwapi subcommands and usage examples.

Permissions

• vwapi.admin : required to use the /vwapi commands.

Notes & Behavior

• Player lookup is exact-case and only returns connected players.
• The HTTP server binds to bindAddress; by default this is 0.0.0.0 (all interfaces). Change to 127.0.0.1 for local-only access or a specific IP if desired.
• When you change bindAddress or port and run /vwapi reload, the plugin will restart the HTTP server automatically to apply the new bind/port (a full proxy restart is no longer required for those changes).

Troubleshooting

• If the HTTP server does not start, check the proxy logs for errors about port binding or resource issues.
• Ensure velocity-api is available at runtime and that the plugin is placed in the correct plugins/ folder.

License & Support

• Licensed under the MIT License.
• If you need any help or support, please contact me on our Discord.