Look, node_modules doesn’t only contain the packages, which you installed, it also contains dependencies of your installed packages. So a good practice is to use lock files as package-lock.json, which will lock every package’s version and every time you run npm install it installs the exact locked versions (to be more precise – with npm ci script). So in this case as I see one of your packages has been updated or maybe that “busboy” package has been updated and after you ran install script it brought to you the updated package (or packages) which involves this error.

Node app is running on port 3000
TypeError: Busboy is not a constructor
at /home/felipe/Desktop/myapp/server.js:19:18
at Layer.handle [as handle_request] (/home/felipe/Desktop/myapp/node_modules/express/lib/router/layer.js:95:5)
at next (/home/felipe/Desktop/myapp/node_modules/express/lib/router/route.js:144:13)
at Route.dispatch (/home/felipe/Desktop/myapp/node_modules/express/lib/router/route.js:114:3)
at Layer.handle [as handle_request] (/home/felipe/Desktop/myapp/node_modules/express/lib/router/layer.js:95:5)
at /home/felipe/Desktop/myapp/node_modules/express/lib/router/index.js:284:15
at Function.process_params (/home/felipe/Desktop/myapp/node_modules/express/lib/router/index.js:346:12)
at next (/home/felipe/Desktop/myapp/node_modules/express/lib/router/index.js:280:10)
at expressInit (/home/felipe/Desktop/myapp/node_modules/express/lib/middleware/init.js:40:5)
at Layer.handle [as handle_request] (/home/felipe/Desktop/myapp/node_modules/express/lib/router/layer.js:95:5)

Thanks