How to detect Left bracket ([)
document.addEventListener('keydown', (event) => {
if (event.key === "[") {
// Left bracket ([) was pressed
}
});Use event.key to react to what the key means (it follows the keyboard layout) and event.code for its physical position, for example WASD in games. keyCode and which are deprecated: they still work, but their values differ between browsers and layouts.
How browsers treat Left bracket ([)
On many European layouts brackets need AltGr, so a shortcut on [ may be hard to type there.
In React
<input onKeyDown={(e) => { if (e.key === "[") { /* … */ } }} />JavaScript Keycode FinderPress any key and instantly see every property of the keyboard event, with a copy-ready keydown snippet for shortcuts.
Open the tool Frequently asked questions
What is the keyCode for Left bracket ([)?
219. It’s deprecated, though: use event.key (“[ (or { with Shift)”) or event.code (BracketLeft) in new code.
What is the difference between event.key and event.code?
event.key is the character or action the key produces with the current layout; event.code is the physical key position, the same on every layout.
Should I use keydown or keypress?
keydown. The keypress event is deprecated and doesn’t fire for keys that don’t produce characters, such as Escape or the arrow keys.