Heroku just recently killed their free plan and it seems that your app is affected. Console error: WebSocket connection to 'wss://js-visualizer-9000-server.herokuapp.com/' failed: Invalid frame header
Heroku just recently killed their free plan and it seems that your app is affected.
Console error: WebSocket connection to 'wss://js-visualizer-9000-server.herokuapp.com/' failed: Invalid frame header