Check /app/package.json: command not found. Is a start script missing?

Node.js projects on Glitch that need a server require a package.json file with a start command in the scripts field to run.

So be sure to include the following in package.json (see an example)

"scripts": { "start": "node server.js" }

• You can replace server.js with the name of your server start file.
• Shell scripts also work.