We will use NVM to downgrade our node environment to 10.15.3. This version is indicated in package.json. If we work with a higher level of node, the node-sass package might be incompatable.
nvm install 12.12.2
node --version
The front-end will run at localhost:3000
cd algorithm-visualizer
npm install
npm run start
The server will run at localhost:8080
cd algorithm-visualizer-server
npm install
npm run watch