Free tool
FiveM server.cfg validator
Paste your FiveM server.cfg below. The validator runs entirely in your browser — your license key never leaves your machine. We'll flag the common mistakes that brick a FiveM server: missing sv_licenseKey, missing endpoints, duplicate ensure lines, OneSync misconfig, hostname truncation, and more.
The validator runs as you type — no submit button, no upload.
What this tool checks
- License key format — must be
cfxk_<random>_<random>from portal.cfx.re. A typo makes the cfx.re master reject the server after the 60-min grace period. - Endpoints — both
endpoint_add_tcpandendpoint_add_udpmust be on0.0.0.0:30120or players can't connect. - OneSync state —
set onesync onis required for > 32 slots and every modern RP framework (ESX, QBCore). - Hostname length — cfx.re master truncates anything over 96 bytes. Emoji eat 4 bytes each; easy to overshoot.
- Duplicate ensure lines — FXServer happily ignores duplicates but they usually mean a copy-paste mistake.
- Master list visibility — flags
sv_master1 ""which hides the server from the cfx.re browser. - Slot count caps — warns at > 64 slots (CPU-bound), errors at > 1024 (master hard cap).
- ScriptHook — flags the common mistake of leaving
sv_scriptHookAllowed 1on a public RP server.
Hosting that catches these for you
We built this validator because our customers kept asking us to review their server.cfg in support tickets. CoalHosting's FiveM panel runs the same checks automatically + ships txAdmin pre-installed, ESX / QBCore one-click, managed MariaDB, daily backups (with the DB dump), and a 30-day no-questions-asked refund. €15/mo for the starter tier, EU only (Helsinki).