Migration script from Strapi v3 on SQL to Strapi v4 on SQL

Preparation steps

Preform a backup of your database you wish to migrate and store that backup somewhere secure

Install

Requirements

Nodejs v14/v16
Yarn

Installation

yarn

Configuration

Choose which database you are migrating from/to (currently this script only supports migrating to the same database type as the source)
Copy the corresponding .env.DBTYPE.example file to .env using something like cp .env.pg.example .env
Modify the configuration in the .env to match your v3 source and your v4 target databases

Migration

Migrate your Strapi Code before running this script, see the following documentation
Run Strapi v4 in develop mode with empty DB to generate the DB structure
Turn off / kill the running Strapi v4 server
Run migration script using yarn start