ESX Framework

Server/client API for ESX Legacy: xPlayer, PlayerData, callbacks, events, jobs and money.

Activation Contract

Load this skill when the user creates or edits an ESX resource, touches xPlayer or ESX.PlayerData, needs jobs, money, accounts, items or weapons through ESX, or asks about ESX callbacks, events or best practices.

Hard Rules

Get the object with ESX = exports['es_extended']:getSharedObject(). On the client, wait for ESX and ESX.IsPlayerLoaded() before reading ESX.PlayerData.
xPlayer exists on the SERVER only (ESX.GetPlayerFromId(source)). ESX.PlayerData exists on the CLIENT only.
Always nil-check: if not xPlayer then return end before calling any method.
Money, items, weapons, jobs and metadata are mutated on the server through xPlayer.* methods, never from the client.
Pass a reason to addMoney, removeMoney, addAccountMoney, removeAccountMoney.
Client callbacks (ESX.TriggerClientCallback, ESX.AwaitClientCallback) must never decide anything sensitive: the client can fake the answer.
Use ESX.SecureNetEvent for client events that only the server may trigger.
Prefer ox_lib for notifications, menus, dialogs and progress bars over ESX UI.
Cache PlayerPedId() and update on esx:playerPedChanged; never Wait(0) loops without need.

Decision Gates

Need	Use
Client asks server for data	`ESX.RegisterServerCallback` + `ESX.TriggerServerCallback`
Server pushes an event to one player	`xPlayer.triggerEvent(name, ...)`
Server-only client event	`ESX.SecureNetEvent(name, cb)` on the client
Find player by source / identifier	`ESX.GetPlayerFromId` / `ESX.GetPlayerFromIdentifier`
Filter players by job etc.	`ESX.GetExtendedPlayers(key, value)`
Usable item	`ESX.RegisterUsableItem(item, cb)`
Admin command with group	`ESX.RegisterCommand(name, group, cb, allowConsole, suggestion)`

Execution Steps

Confirm es_extended starts before the resource; acquire ESX per side.
Decide the side: mutation and validation on server, display on client.
Fetch xPlayer, nil-check, then validate every client-supplied argument.
Pick the call from Decision Gates; read the matching rules file for signatures.
Return data via callbacks, not paired events.

Output Contract

Return runnable Lua with the client/server split explicit, xPlayer nil-checked, and reasons on money operations. Use ox_lib for UI unless the user asks otherwise.

References

rules/core-concepts.md — architecture, PlayerData, xPlayer, startup flow.
rules/client-functions.md — client-side ESX functions and player state.
rules/server-functions.md — player retrieval, callbacks, commands, jobs, items.
rules/xplayer-methods.md — xPlayer money, accounts, inventory, weapons, meta.
rules/events-callbacks.md — server/client callbacks, events, SecureNetEvent.
rules/best-practices.md — naming, caching, loops, security, Lua 5.4.
rules/reference-links.md — official ESX documentation links.

Upstream docs: https://docs.esx-framework.org