Debugging QBCore Resources - QBCore Guide for FiveM

Introduction

This tutorial turns Debugging QBCore Resources into a clean, developer-friendly guide for QBCore/FiveM. You will follow a step-by-step flow, copy the relevant code patterns, and learn the “why” behind the setup.

Requirements

• QBCore installed and running on a dev server
• Basic Lua knowledge and comfort reading FiveM patterns
• A test workflow for iterating safely (dev server, not production)
• Optional: a code editor with Lua/FiveM helpers (VS Code recommended)

Step-by-Step Guide

Step 1: Before You Dive In

In this step, you will apply the before you dive in concept as a practical change: define the pieces, wire them together, then verify the behavior in your dev server.

Step 2: Logging Fundamentals

In this step, you will apply the logging fundamentals concept as a practical change: define the pieces, wire them together, then verify the behavior in your dev server.

Step 3: Inspecting Events with the Event Debugger

In this step, you will apply the inspecting events with the event debugger concept as a practical change: define the pieces, wire them together, then verify the behavior in your dev server.

Step 4: Validating Configuration and Data

In this step, you will apply the validating configuration and data concept as a practical change: define the pieces, wire them together, then verify the behavior in your dev server.

Step 5: A Repeatable Debugging Workflow

In this step, you will apply the a repeatable debugging workflow concept as a practical change: define the pieces, wire them together, then verify the behavior in your dev server.

Step 6: See Also

In this step, you will apply the see also concept as a practical change: define the pieces, wire them together, then verify the behavior in your dev server.

Code Example

local QBCore = exports['qb-core']:GetCoreObject()
 
RegisterNetEvent('qb-example:server:doThing', function(data)
    local src = source
    QBCore.Functions.Print('[qb-example] received payload', json.encode(data))
 
    if not data or not data.playerId then
        QBCore.Functions.Print('[qb-example] missing playerId, aborting request', 'error')
        return
    end
 
    -- ...rest of your handler
end)

Tips & Best Practices

• Keep authority on the server: validate inputs before money/database operations.
• Start with one resource/module at a time, then refactor after you verify it works.
• Use callbacks for request/response flows and events for push/UX updates.
• When you run loops, avoid freezes: always yield with Wait() (client/server) and cache hot values.