| Unable to load the localhost page in browser |
Your URL does not match your port number. |
Double check what port you have set in server.js and if your browser URL is localhost:PORT with PORT being the number you have set. |
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You forgot to tell the Express app to listen to a port number. |
Make sure you have app.listen(port, () => {}) in server.js to configure which port you want Express to watch. |
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You have another app running on the same port. |
Close any additional servers that might be running. Only one app per port is possible. |
ESLint warns you about the use of the console |
You have not configured ESLint to accept console.log. |
Make sure you have rules: {'no-console': 'off' }, set in .eslintrc.js as directed in Eslint Customization |
TypeError: app.listen is not a function or similar |
You forgot to export one of your modules (ie. app or router). |
Make sure you have module.exports = router; at the end of your router files and module.exports = app; where you created your new Express app. |
Error: Cannot find module <NAME> |
You're requiring the module from the wrong path. |
Double check the path in the require(PATH) is pointing to the correct location. |
| localhost is loading indefinitely |
You forgot to include (or you are not hitting) a response method. |
Make sure the handler function includes a response method to end the HTTP request-response cycle. |