Made it with React, Node.js and Express.
Regenerate node modules (client/server):
npm install
Run (server):
node app.js
Run (client):
npm run
Production build (client):
npm run build
You need to set up environment variables for both, client and server.
Client (url of API KEY):
REACT_APP_API_URL
Server (for Sequelize/Postgres):
PGUSER
PGHOST
PGPASSWORD
PGDATABASE
PGPORT