Skip to content


Subversion checkout URL

You can clone with
Download ZIP
Pokémon battle simulator.
Failed to load latest commit information.
chat-plugins The Studio plugin: show number of noms in viewnoms
config Add descs for Random Battle and Hackmons Cup
data Random Battle: Few updates
dev-tools Turn on strict mode globally for real
lib Some cleanup in /modlog
logs Replace 'this.sendReply' with 'this.errorReply' in some cases
mods Fix Serene Grace's interaction with Secret Power
static Improve static files
test Test: increase time limit for redirection tests
tournaments Remove stray space in tournament help command
.gitignore Migrate build system to ESLint
.travis.yml Migrate build system to ESLint
LICENSE License: Update copyright year to include 2015 Update documentation of -ability message protocol
Procfile Make Procfile specify Heroku's desired port Add Bumba to credits
app.js Remove es6-shim dependency
battle-engine.js Add Illusion end message
cidr.js Remove some unused variables
command-parser.js Fix modchat permissions
commands.js Merge pull request #2284 from Nineage/patch-2
crashlogger.js Turn on strict mode globally for real
dnsbl.js Turn on strict mode globally for real
ladders-remote.js Ladder refactor
ladders.js Fix ladders
loginserver.js Migrate build system to ESLint
monitor.js Migrate build system to ESLint
old-simulator-doc.txt Update "Pokemon" to "Pokémon" in old-simulator-doc.txt file
package.json Turn on strict mode globally for real
repl.js Prefer ES6 octal literals to string form
rooms.js Don't put data-URI images in roomlogs
simulator-doc.txt Remove [InterruptMove]
simulator.js Style fixes
sockets.js Fix DoS vulnerability in network protocol
team-validator.js Small team validation update
tools.js Change data loading order
users.js Allow sysops to join modjoin rooms
verifier.js Use strict mode and let and const instead of var

Pokémon Showdown

Navigation: Website | Server repository | Client repository

Build Status Dependency Status devDependency Status


This is the source code for the game server of Pokémon Showdown, a website for Pokémon battling. Pokémon Showdown simulates singles, doubles and triples battles in all the games out so far (Generations 1 through 6).

This repository contains the files needed to set up your own Pokémon Showdown server. Note that to set up a server, you'll also need a server computer.

You can use your own computer as a server, but for other people to connect to your computer, you'll need to expose a port (default is 8000 but you can choose a different one) to connect to, which sometimes requires port forwarding (note that this isn't possible on certain internet connections).


Pokémon Showdown requires you to have Node.js installed, 4.x or later. (Alternatively, most versions of io.js also work, but is not recommended.)

Next, obtain a copy of Pokémon Showdown. If you're reading this outside of GitHub, you've probably already done this. If you're reading this in GitHub, there's a "Clone" button in the bottom of the right sidebar, or if you're really lazy, there's a "ZIP" download button. I recommend the Clone method - it's more time-consuming to set up, but much easier to update.

Pokémon Showdown is installed and run using a command line. In Mac OS X, open Terminal (it's in Utilities). In Windows, open Command Prompt (type cmd into the Start menu and it should be the first result). Type this into the command line:


Replace LOCATION with the location Pokémon Showdown is in (ending up with, for instance, cd "~/Downloads/Pokemon-Showdown" or cd "C:\Users\Bob\Downloads\Pokemon-Showdown\").

This will set your command line's location to Pokémon Showdown's folder. You'll have to do this each time you open a command line to run commands for Pokémon Showdown.

To install dependencies, run the command:

npm install --production

Copy config/config-example.js into config/config.js, and edit as you please.

Congratulations, you're done setting up Pokémon Showdown.

Now, to start Pokémon Showdown, run the command:

node app.js

You can also specify a port:

node app.js 8000

Visit your server at http://SERVER:8000

Replace SERVER with your server domain or IP. Replace 8000 with your port if it's not 8000 (the default port).

Yes, you can test even if you are behind a NAT without port forwarding: http://localhost:8000 will connect to your local machine. Some browser setups might prevent this sort of connection, however (NoScript, for instance). If you can't get connecting locally to work in Firefox, try Chrome.

You will be redirected to The reason your server is visited through is to make it more difficult for servers to see a user's password in any form, by handling logins globally. You can embed this in an iframe in your website if the URL is a big deal with you.

If you truly want to host the client yourself, there is a repository for the Pokémon Showdown Client. It's not recommended for beginners, though.

Setting up an Administrator account

Once your server is up, you probably want to make yourself an Administrator (~) on it.


To become an Administrator, create a file named config/usergroups.csv containing


Replace USER with the username that you would like to become an Administrator. Do not put a space between the comma and the tilde.

This username must be registered. If you do not have a registered account, you can create one using the Register button in the settings menu (it looks like a gear) in the upper-right of Pokémon Showdown.

Once you're an administrator, you can promote/demote others easily with the /admin, /leader, /mod, etc commands.

Browser support

Pokémon Showdown currently supports, in order of preference:

  • Chrome
  • Firefox
  • Safari
  • Chrome/Firefox/Safari for various mobile devices
  • Opera
  • Firefox for Android
  • IE9+

IE8 support can technically be added without too much difficulty, but it doesn't run PS fast enough to be usable.

As for older browsers (Firefox 3.6), I won't go out of my way to support them, but if there's a simple fix, you can suggest it to me and I'll implement it.


PS has a built-in chat service. Join our main server to talk to us!

You can also visit the Pokémon Showdown forums for discussion and help.


Pokémon Showdown's server is distributed under the terms of the MIT License.



  • Guangcong Luo [Zarel] - Development, Design, Sysadmin


  • Chris Monsanto [chaos] - Sysadmin
  • Hugh Gordon [V4] - Research (game mechanics), Development
  • Juanma Serrano [Joim] - Development, Sysadmin
  • Leonardo Julca [Slayer95] - Development
  • Mathieu Dias-Martins [Marty-D] - Research (game mechanics), Development
  • [The Immortal] - Development

Retired Staff

  • Bill Meltsner [bmelts] - Development, Sysadmin
  • Cathy J. Fitzpatrick [cathyjf] - Development, Sysadmin


  • Andrew Goodsell [Zracknel] - Art (battle weather backdrops)
  • Bär Halberkamp [bumbadadabum] - Development
  • Ben Davies [Morfent] - Development
  • Ben Frengley [TalkTakesTime] - Development
  • Cody Thompson [Rising_Dusk] - Development
  • Jacob Zimmer [SolarisFox] - Development
  • Kevin Lau [Ascriptmaster] - Development, Art (battle animations)
  • Konrad Borowski [xfix] - Development
  • Quinton Lee [sirDonovan] - Development
  • Robin Vandenbrande [Quinella] - Development

Special thanks

Something went wrong with that request. Please try again.