Console
Where your browser shows hidden errors and messages.
What is Console?
Press F12 in any browser to open developer tools. The Console tab shows errors, warnings, and logs from your app. When something isn't working and you can't see why — check the console first. It usually tells you exactly what's wrong.
Red text in the console means an error. Yellow means a warning. The error message often includes the file name and line number where the problem is.
In Vibe Coding
When your vibe coded app isn't working and you can't see why — open the console. In Chrome, press F12 and click the Console tab. Red errors tell you exactly what's broken. Copy the error message and paste it to Cursor or Lovable to fix it.
Example
For example: Your app's button doesn't work when clicked. You open the console and see: "TypeError: Cannot read property email of undefined." Now you know the user object is empty — the data didn't load.