esx-framework
ESX Legacy Framework for FiveM - Player management, jobs, economy, inventory, weapons. Use when creating ESX resources or working with xPlayer, PlayerData, ESX functions.
What this skill does
# ESX Framework Development Complete guide for developing with ESX Legacy Framework — the most trusted FiveM roleplay framework since 2017. ## When to use - Creating or editing ESX resources/scripts - Working with player data (xPlayer, PlayerData) - Implementing jobs, economy, inventory, or weapon systems - Using ESX client/server functions, callbacks, or events - Questions about ESX best practices and optimization ## How to use Read individual rule files for detailed explanations and examples: - **rules/core-concepts.md** — ESX architecture, PlayerData, xPlayer object, framework initialization - **rules/client-functions.md** — Client-side ESX functions, UI systems, player state management - **rules/server-functions.md** — Server-side functions, player retrieval, callbacks, triggers - **rules/xplayer-methods.md** — xPlayer object methods: money, items, weapons, inventory, jobs, metadata - **rules/jobs-economy.md** — Job system, salaries, accounts (money/bank), society management - **rules/inventory-items.md** — Inventory system, item management, usable items, weight calculations - **rules/weapons-loadout.md** — Weapon system, loadout, components, ammo, tints - **rules/events-callbacks.md** — ESX events, server callbacks, client callbacks, secure net events - **rules/best-practices.md** — ESX coding standards, optimization, security, naming conventions - **rules/reference-links.md** — Official ESX documentation links ## Key principles 1. **Always check for nil** — `if xPlayer then ... end` before using xPlayer 2. **Use ESX.GetPlayerFromId** — Standard player retrieval: `local xPlayer = ESX.GetPlayerFromId(source)` 3. **Wait for player load** — Check `ESX.IsPlayerLoaded()` on client before accessing PlayerData 4. **Never trust client** — Validate all data server-side, use SecureNetEvent for client events 5. **Follow ESX patterns** — Use ESX functions instead of reinventing (callbacks, notifications, etc.) 6. **Optimize loops** — Cache player objects, avoid unnecessary GetPlayerFromId calls 7. **Use camelCase** — Follow Lua naming: `myVariable`, `MyGlobalFunction`, `MY_CONSTANT` 8. **Minimal globals** — Keep variables local unless they need global scope 9. **Use ox_lib for UI** — Prefer ox_lib for menus, dialogs, notifications, progress bars instead of ESX UI
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