Error: lineNumber

Non-standard: This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.

The lineNumber data property of an Error instance contains the line number in the file that raised this error.


A positive integer.

Property attributes of Error: lineNumber
Writable yes
Enumerable no
Configurable yes


Using lineNumber

try {
  throw new Error("Could not parse input");
} catch (err) {
  console.log(err.lineNumber); // 2

Alternative example using error event

window.addEventListener("error", (e) => {
  console.log(e.lineNumber); // 5
const e = new Error("Could not parse input");
throw e;

This is not a standard feature and lacks widespread support. See the browser compatibility table below.


Not part of any standard.

Browser compatibility

BCD tables only load in the browser

See also