Godot 4 Migration Guide

Overview

A critical guide for developers transitioning from Godot 3.x to Godot 4. This skill focuses on the major syntax changes in GDScript 2.0, the new Tween system, and export annotation updates.

When to Use This Skill

• Use when porting a Godot 3 project to Godot 4.
• Use when encountering syntax errors after upgrading.
• Use when replacing deprecated nodes (like Tween node vs create_tween).
• Use when updating export variables to @export annotations.

Migration procedure

Work in a backed-up branch or copy. Choose an exact Godot 4 version, validate conversion before changing files, and inspect converter gaps, renamed nodes, shaders, physics, plugins and export targets. Test scenes and saved games before replacing the working Godot 3 build. Examples below are fragments in an appropriate Node script; Enemy must be a declared project type.

Official guide: Upgrading to Godot 4.