coderef

Optional catch bindingBaseline · Widely available

Omit the binding parameter of a catch clause when you don't need information about the exception in a try ... catch statement.

Supported in all major browsers for at least 30 months — safe to use without fallbacks. Baseline since Jan 15, 2020. Widely available since Jul 15, 2022.

How to use ↓Compare browsers

Browser support

DesktopChrome
1–65Not supported
66+Supportedsince Apr 17, 2018
Current: 155
Edge
12–18Not supported
79+Supportedsince Jan 15, 2020
Current: 154
Firefox
1–57Not supported
58+Supportedsince Jan 23, 2018
Current: 157
Safari
1–11Not supported
11.1+Supportedsince Apr 12, 2018
Current: 27
MobileChrome Android
18–65Not supported
66+Supportedsince Apr 17, 2018
Current: 155
Firefox Android
4–57Not supported
58+Supportedsince Jan 22, 2018
Current: 157
Safari iOS
1–11Not supported
11.3+Supportedsince Mar 29, 2018
Current: 27

How to use

This feature is Baseline widely available — use it freely, no fallback needed.

Example

Full syntax and examples are on MDN — see the links below.

Feature detection

JS · check before using
// Syntax can't be tested with an if-statement — an unsupported
// browser fails to parse the whole script. Either transpile for older
// targets (e.g. Babel/TypeScript/esbuild), or probe in isolation:
let supported = true;
try {
  new Function("/* code that uses the syntax */");
} catch {
  supported = false;
}

This is a language syntax feature.

Specification