JavaScript: How to Use Browser Console

By Xah Lee. Date: 2009-01-30. Last updated: 2020-05-02.

A easy way to try JavaScript code is to use browser's JavaScript console, usually under a menu named Developer Tool.

Google Chrome Browser

On Google Chrome browser for Windows: Press F12 or Ctrl+Shift+i to toggle JavaScript console.

On macOS ⌘ command+⌥ option+i

Firefox on Microsoft Windows, Press Ctrl+Shift+i to toggle JavaScript console.
Firefox on macOS, Press ⌘ command+⌥ option+i to toggle JavaScript console.

In Safari, first turn on Develop menu.

then press ⌘ command+⌥ option+i to toggle the JavaScript console.

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