01 / Explore togetherOne shared Commonwealth
Weather, time of day, radstorms and every wandering raider are the same for everyone on the server. Walk into Concord together and you walk into the same fight, not two copies of it.
Free Fallout 4 mod · PC
The wasteland is better
with company.
PRE-ALPHA · NO PUBLIC BUILD YET
01What it does
Fallout MP keeps the Commonwealth intact and puts other people in it. Here is what that means in practice.
01 / Explore togetherWeather, time of day, radstorms and every wandering raider are the same for everyone on the server. Walk into Concord together and you walk into the same fight, not two copies of it.
02 / Build togetherWorkshop mode is shared and saved. Walls, generators, turrets and the wiring between them survive the session, so a settlement is worth defending and worth raiding.
03 / Make it yoursA dedicated binary for Windows and Linux, configured by one JSON file, listed in the in-game browser when you want it and private when you do not.
Damage, limb crippling and death are settled server-side, so a kill counts the same for everyone. V.A.T.S. still slows time for you alone - the wasteland keeps moving for everybody else.
Frames, plating and fusion cores exist in the world rather than in your menu. Leave a T-60 unattended at the edge of a firefight and somebody else can climb into it.
S.P.E.C.I.A.L., perks, weapon mods and legendary effects replicate, so the scoped .50 you put together looks and behaves the same in someone else’s hands as in yours.
Dogmeat, Codsworth and every vendor run as server-side NPCs instead of one player’s local copy. They can follow a squad, hold a stash, or be scripted into something the base game never had.
Containers, stashes, vendor inventories and player-to-player trade all go through the server, which means scarcity is real and a market can actually form around it.
Game modes, rules, economies and whole questlines are server-side resources in TypeScript or JavaScript. The base game is the engine; what runs on top is yours.

Two hundred years later
Fallout 4 shipped a Commonwealth built for one survivor. Fallout MP hands the same road to your whole group and lets the wasteland sort out the rest.
02Scripting
Resources are plain TypeScript or JavaScript, loaded by the server and hot-reloaded while players stay connected. The API below is the one the mod itself is built on.
Drop a folder in resources/, export a server entry point, and the server loads it. Greet players as they come out of the vault and hand them a starter kit on request.
import { Chat, Events, Inventory } from '@falloutmp/server'
Events.on('playerSpawned', (player) => {
Chat.send(player, `Welcome to the Commonwealth, ${player.name}. Try /kit.`)
})
Events.on('playerCommand', (player, command) => {
if (command !== 'kit') return
if (player.state.get('kitTaken')) {
Chat.send(player, 'You have already taken a kit.')
return
}
Inventory.give(player, [
{ item: 'stimpak', count: 3 },
{ item: '10mm_pistol', mods: ['short_barrel', 'reflex_sight'] },
{ item: 'ammo_10mm', count: 48 },
])
player.state.set('kitTaken', true)
})03Gallery
Screenshots are from Fallout 4 itself. They show the world Fallout MP runs on.

Every player carries their own inventory, gear and condition. Trade ammo, split a stimpak, or leave someone behind in the dust - the Commonwealth does not care either way.

Workshop mode is shared. Walls, generators and turrets go up collaboratively and stay up, which means a settlement is worth defending and worth raiding.

Servers can host the fortified towns the wasteland grew around. Trade, argue, take a contract, and head back out before dark.
04Server concepts
A few starting points. The interesting ones are the servers nobody has thought of yet.

Roleplay
Player-run settlements, a sheriff with actual powers, and grudges that outlive the session. Characters persist, so a reputation is something you earn and something you lose.

Trade
Move scrap and purified water between settlements on a timer, and let other players decide whether the road is safe. An economy is only interesting when the supply line can be cut.

Survival
Scripted assault waves, scarce stimpaks and permanent consequences. Turn the whole server into one long night that the Commonwealth is not guaranteed to survive.
05Questions

There is no public build yet. Join the Discord to follow development, get the first test builds, and help work out what the wasteland should feel like with other people in it.
Join the Discord