ox_core FiveM Framework: Complete Guide for 2026

ox_core (also written ox_core and often searched as 'ox core fivem') is a server framework for FiveM / RedM servers maintained by the Overextended team. Where ESX ('EssentialMode Extended') grew organically over years with hundreds of loosely-coupled addon scripts, ox_core was designed as a clean, modern foundation: entity-based player data, a single shared context for inventories/events/targets through ox_lib, TypeScript-based resources, and a public API that's consistent and documented. It is free and open source. The core resource is 'ox_core' which provides player data, groups, char-selecting, and the event/export layer used by the whole ox ecosystem.

ESX - the most widely deployed framework, with the biggest library of free scripts and the largest community. Best if you want maximum script availability. QBCore - modern Lua, cleaner than legacy ESX, massive ecosystem, but its 'QB ecosystem' (qb-inventory, qb-target, etc.) ties you to one style. ox_core - smallest ecosystem today, but fastest, best-structured, and deeply integrated with ox_lib/ox_inventory (arguably the best inventory and target systems on FiveM). Choosing ox_core means you accept fewer ready-made scripts early on, but the code quality and performance are top-tier. In 2026 many new roleplay creators start with ox_core or with ESX/QBCore 'Recipes' in txAdmin that pre-package ox_inventory instead of the default inventories.

To install ox_core: download the latest release from the Overextended GitHub, or use the txAdmin Recipe for a one-click setup. You need a MySQL/MariaDB database - create one in your hosting panel first, then configure the connection in server.cfg with set mysql_connection_string. Essential prerequisites: ox_lib (required, it provides UI, context menus, and common functions), and a framework client/bridge. Recommended stack: ox_lib, ox_core, ox_inventory, ox_target, ox_doorlock. Checklist after install: run the included SQL schema, ensure ox_inventory core (the database inventory) is active, set your admin identifier, then test /adminmenu. The Overextended docs at overextended.dev cover each step - follow them exactly and you'll avoid 90% of common setup errors.

ox_core uses a clean export-based API. Common examples: ox.player: offline vs online players, ox.player.addItem / removeItem interact with ox_inventory seamlessly, ox.player.getCharacter for the current character, ox.group and ox.player.addGroup for job/rank permissions, ox.player.setStateBag for per-player state (e.g., duty status). Because everything funnels through ox_lib, your scripts don't need to know about ox_inventory's database directly - the framework handles the coupling. If a script in the marketplace says 'ox_core compatible' or 'overextended compatible', it uses this standard API. Learning this API is the fastest way to write clean, future-proof FiveM scripts.

Most ox_core issues are setup problems. 1) 'Unable to connect to database' - your mysql_connection_string is wrong or the DB doesn't exist; double-check host, port, user, password, and database name. 2) 'ox_core requires ox_lib' - install ox_lib (the shared library) before ox_core; it won't start without it. 3) resource won't start - check fxmanifest.lua dependencies and that you didn't rename folders improperly. 4) inventory doesn't show - ensure ox_inventory is started after ox_core and the 'inventory' resource is enabled. 5) player can't spawn - run the character spawning resource (ox_core includes a basic setup, but custom char selection resources need the correct exports). Always check the server console (txAdmin log) for the exact error line and search the Overextended docs or Discord for it.

ox_core is efficient by FiveM standards - it uses fewer resources than a feature-bloated ESX install. Realistic minimums: 32-slot RP server: 4 GB RAM, 2 vCPU. 64-slot server with ox_inventory + ox_target + frequent events: 8 GB, 4 vCPU. 128-slot OneSync Infinity: 16 GB+. Because ox may include heavy resources (ox_inventory, ox_target), the CPU profile scales with your scripts, not just the framework. NVMe storage helps map and asset loading, and a strong DDoS-protected network keeps RP stable. CyberNex FiveM plans include txAdmin Recipes (core, QBCore, ESX, ox_core templates), MySQL databases, and Enterprise DDoS - deploy ox_core in under a minute and connect to your .cfx.re license key.