Enable the Developer Console
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In newer versions of Garry's Mod, the developer console is enabled by default and the in-game option to enable/disable it has been removed. These instructions are only for older Garry's Mod versions before this change.
If you are on a never version of Garry's Mod and your developer console is not showing, check your key bindings to ensure you're pressing the correct key. Try restarting the game if you can't get it to show.
Step 1: Open Options
Step 2: Click Advanced
<image of options window with advanced tab highlighted>
Step 3: Check "Enable developer console" and click "OK"
<advanced options window with option highlighted>
That’s it! You should now be able to open the console with the ` key. If that key doesn’t work or you want to change the keybind, open Options again and scroll to the bottom of the Keyboard settings. You will see “Toggle developer console” at the very bottom of the list.